Journal of Molecular Liquids, volume 364, pages 120036

Application of a new amidoxime surfactant in flotation separation of scheelite and calcite: Adsorption mechanism and DFT calculation

Zhiqiang Huang 1
, 
Shuyi Shuai 2
, 
V. E. Burov 3
, 
Vladimir Z Poilov 3
, 
Fangxu Li 4
, 
Hong-Ling Wang 4
, 
Rukuan Liu 5
, 
Shiyong Zhang 2
, 
Cheng Chen 2
, 
Wei Li 2
, 
Xiaowen Yu 2
, 
Guichun He 2
, 
Weng Fu 6
Show full list: 13 authors
1
 
2
 
3
 
4
 
Guangdong Institute of Resources Comprehensive Utilization, Guangzhou 510650, China | 
5
 
Hunan Academy of Forestry, Changsha, Hunan 410004, China | 
6
 
Publication type: Journal Article
Publication date: 2022-10-01
scimago Q1
wos Q1
SJR: 0.918
CiteScore: 10.3
Impact factor: 5.3
ISSN: 01677322, 18733166
Materials Chemistry
Electronic, Optical and Magnetic Materials
Physical and Theoretical Chemistry
Spectroscopy
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Abstract
Separation of scheelite from calcite by froth flotation using a new amidoxime surfactant - 3-dodecylamine propyl amidoxime (DPA). • A new amidoxime surfactant DPA was used to flotation separate scheelite and calcite. • Scheelite and calcite recovery were 92% and 4.5% respectively. • DPA exhibited preferable selectivity than NaOL in the absence of depressant. • The interaction of DPA surfactant on scheelite surface is electrostatic adsorption. With its high electrical conductivity, thermal creep resistance and compression modulus, tungsten take an irreplaceable position in modern industry, defense, and high technology. Scheelite, as the main raw material of tungsten resources, usually adopts Petrov’ process: steam heating 80 °C-90 °C, stirring in a tank containing 2%-4% sodium silicate solution for more than half an hour to make sodium oleate desorbed on the calcite surface, and repeated cleaning. Herein, a new amidoxime surfactant 3-dodecylamine propyl amidoxime (DPA), had been synthesized and used as a collector for the first time in the flotation separation of scheelite and calcite at room temperature without any sodium silicate, and compared with the traditional collector sodium oleate (NaOL). The flotation behavior of DPA was studied by micro-flotation and mixed binary mineral flotation tests, which showed that DPA has good collection ability and excellent selectivity for scheelite. Meanwhile, the interaction mechanism of DPA on the mineral surface was discussed by FTIR analysis, zeta potential test, contact angle measurement and density functional theory (DFT). FTIR analysis and zeta potential test confirmed that DPA collector had adsorption on scheelite surface but had little effect on calcite. DFT calculation further confirmed that the positively charged –C(NOH)N + H 3 group in DPA had electrostatic adsorption on the negatively charged scheelite surface. The contact angle measurement results revealed that DPA can enhance the surface hydrophobicity of the scheelite particles. Therefore, this highly selective DPA surfactant can achieve effective separation of scheelite and calcite, contributing to environmental protection and sustainable green development of resources.
Found 55
By date By citations
American Chemical Society (ACS)
Adsorption of Trisiloxane Surfactant for Selective Flotation of Scheelite from Calcite at Room Temperature
Huang Z., Shuai S., Burov V.E., Poilov V.Z., Li F., Wang H., Liu R., Zhang S., Cheng C., Li W., Yu X., He G., Fu W.
Langmuir scimago Q1 wos Q2 , 
2022-07-14,  citations by CoLab: 25 ,  Abstract  
The separation and enrichment of scheelite from calcite are hindered by the similar active Ca2+ sites of scheelite and the calcite with calciferous gangue. Herein, a novel trisiloxane surfactant, N-(2-aminoethyl)-3-aminopropyltrisiloxane (AATS), was first explored and synthesized and recommended as the collector for the flotation separation of scheelite from calcite. The micro-flotation and mixed binary mineral flotation tests showed that AATS had excellent collection performance for scheelite and high selectivity for calcite within a wide pH range. At the same time, contact angle and zeta-potential measurements, Fourier transform infrared (FTIR) analysis, and density functional theory (DFT) calculations revealed the relevant adsorption mechanism. The contact angle measurement showed that AATS can increase the contact angle of the scheelite surface from 41.7 to 95.8°, greatly enhancing the hydrophobicity of the mineral surface. The results of FTIR analysis and zeta-potential measurement explained that AATS was electrostatically adsorbed on the mineral surface, and DFT calculation further verified that the -N+H3-positive group in AATS was adsorbed on the negatively charged scheelite surface. Therefore, AATS can realize the expectation of high efficiency and selectivity of minerals and enhance the adhesion between the surface of scheelite minerals and bubbles, providing a fresh approach to industrial production.
Elsevier
Selective separation of wolframite from calcite by froth flotation using a novel amidoxime surfactant: Adsorption mechanism and DFT calculation
Shuai S., Huang Z., Burov V.E., Poilov V.Z., Li F., Wang H., Liu R., Zhang S., Cheng C., Li W., Yu X., He G., Fu W.
Minerals Engineering scimago Q1 wos Q1 , 
2022-07-02,  citations by CoLab: 38 ,  Abstract  
Wolframite was separated and extracted from calcite by using a new type of amidoxime surfactant − 3-dodecylamine propyl amidoxime (DPA) as a flotation collector. • A novel amidoxime surfactant DPA was synthesized by lab. • DPA was first introduced in flotation for separation of wolframite from calcite. • DPA has superior selective adsorption performance at wolframite interface. • The wolframite recovery was 96% and calcite only 2 % at pH 7 and 2 × 10 -4 mol/L DPA. This study concentrated on the adsorption features and mechanism of a novel amidoxime surfactant 3-dodecylamine propyl amidoxime (DPA) used as a new wolframite collector on wolframite and calcite surfaces. The flotation experiment showed that DPA collector has a remarkable flotation separation effect on wolframite and calcite. Additionally, the results of the contact angle and zeta potential measurements, and FTIR spectral analysis revealed that the DPA had produced strong electrostatic adsorption on the surface of wolframite, but almost no adsorption on calcite. The results of the DFT calculation showed that DPA had a strong effect on the wolframite surface mainly through the positive charged –C(NOH)N + H 3 group. It provides a new idea for the flotation separation of wolframite and calcite.
Royal Society of Chemistry (RSC)
Iron ore production using a new Gemini surfactant at 273 K
Huang Z., Li W., Shuai S., Zhang S., Wang H., Liu R., Cheng C., Yu X., He G., Fu W.
Chemical Communications scimago Q1 wos Q2 , 
2022-06-29,  citations by CoLab: 4 ,  Abstract  
A Gemini surfactant and a conventional monomeric surfactant were compared in the reverse froth flotation of magnetite ore at 273 K.
Elsevier
Insights into the influence of temperature on the adsorption behavior of sodium oleate and its response to flotation of quartz
Cao S., Yin W., Yang B., Zhu Z., Sun H., Sheng Q., Chen K.
International Journal of Mining Science and Technology scimago Q1 wos Q1 Open Access , 
2022-03-01,  citations by CoLab: 72 ,  Abstract  
Temperature affects the flotation of quartz in the calcium/sodium oleate (NaOL) system, while there is a lack of understanding of its potential mechanism. Therefore, in this work, the flotation response of quartz to temperature was investigated via micro-flotation experiments, interface property analyses, and theoretical calculations. Flotation results demonstrated that increasing temperature contributed to higher flotation recovery of quartz, which enhanced the removal of quartz from hematite. Surface tension results revealed that higher temperatures lowered the critical micelle concentration (CMC) and surface tension of the NaOL solution, and thus enhanced its surface activity. Solution chemistry calculations and X-ray photoelectron spectroscopy (XPS) measurements confirmed that the increased content of Ca(OH) + achieved by increasing temperatures enhanced the adsorption amounts of calcium species (acting as activation sites) on the quartz surface. Dynamic light scattering (DLS) measurements verified that the association degree of RCOO − to form (RCOO) 2 2− was strengthened. Furthermore, adsorption density measurements and molecular dynamics (MD) simulations confirmed that increasing the temperature facilitated NaOL adsorption toward the surface of the quartz, which was attributed to the stronger interaction between NaOL and the calcium-activated quartz surface at higher temperatures. As a result, quartz flotation was improved by increasing temperatures. Accordingly, a possible adsorption model was proposed.
Elsevier
Froth flotation separation of lepidolite ore using a new Gemini surfactant as the flotation collector
Huang Z., Shuai S., Wang H., Liu R., Zhang S., Cheng C., Hu Y., Yu X., He G., Fu W.
Separation and Purification Technology scimago Q1 wos Q1 , 
2022-02-01,  citations by CoLab: 74 ,  Abstract  
Comparison diagram of flotation behavior of lepidolite by new Gemini collector HBDB and traditional monomolecular collector DA. • A novel amine-based Gemini surfactant HBDB was synthesized in our lab. • HBDB was introduced as an efficient collector of lepidolite flotation. • HBDB has better collecting ability and selectivity than traditional collector DA. • Using less dosage HBDB obtained a higher quality lepidolite concentrate. The global lithium supply and demand in this century is accelerated by the energy transition from carbon-based fossil fuels to renewable energy where electrical energy storage and electric vehicles heavily depend on the lithium-ion battery. The lepidolite is one of the main resources for extracting lithium, and it is usually enriched by froth flotation separation technology. However, the traditional lepidolite collector is monomer surfactant with only a single hydrophobic group and hydrophilic group, which usually leads to the low flotation separation efficiency. Therefore, to achieve the flotation separation of lepidolite ore more efficiently, in this work, an amine-based Gemini surfactant, hexanediyl-α, ω-bis (Dimethyldodecylammonium bromide) (HBDB), was synthesized, and compared with the conventional single molecule collector dodecylamine (DA). The experimental results show that the optimum pH value of flotation is 3, and the optimum dosage of HBDB and DA are 150 g/t and 300 g/t respectively. In bench-scale flotation experiments, compared with the conventional monomer DA collector (350 g/t), the Gemini HBDB with only 1/2 dosage of DA (175 g/t) increased the recovery of lepidolite by 16.18%. Economic calculation for a lepidolite ore plant, 1500 t/d, demonstrating that using Gemini HBDB can gain more about $ 8.2 million USD per year than using traditional unimolecular DA. Accordingly, this study provides a new and highly efficient collector for the flotation separation of lepidolite ore.
Elsevier
Depression behaviors of N-thiourea-maleamic acid and its adsorption mechanism on galena in Mo-Pb flotation separation
Lu L., Xiong W., Zhu Y., Zhang X., Zheng Y.
International Journal of Mining Science and Technology scimago Q1 wos Q1 Open Access , 
2022-01-01,  citations by CoLab: 23 ,  Abstract  
In present study, a novel organic depressant N-thiourea-maleamic acid (TMA) was synthesized and applied as a galena depressant in the flotation separation of Mo-Pb ores. The depression behaviors of TMA were tested through flotation experiments. A wider separation window for single minerals over 90.0% was obtained at 30.0 mg/L TMA, confirming that TMA could depress galena significantly, while effected molybdenite floatability slightly. An effective separation was obtained for artificially mixed minerals and actual Mo-Pb ores. The adsorption mechanism on galena was revealed by UV–Vis spectra, zeta potential tests, Fourier transform infrared spectroscopy (FT-IR) analysis, contact angle tests and X-ray photoelectron spectroscopy (XPS) analysis. The zeta potentials of galena became more negative and the contact angle of galena dropped from initial 74.36° to 57.8° with 30.0 mg/L TMA depressant, inferring that TMA had adsorbed on galena surface. The analysis results of UV–Vis spectra, FT-IR and XPS gave further evidence that TMA might chemisorb on galena surface via Pb sites on galena surface and the thiourea group in TMA molecular structure, while the carboxyl group played a role of hydrophilicity.
Elsevier
Insight into the low-rank coal flotation using amino acid surfactant as a promoter
Niu C., Xia W., Li Y., Bu X., Wang Y., Xie G.
Fuel scimago Q1 wos Q1 , 
2022-01-01,  citations by CoLab: 38 ,  Abstract  
• Sodium Cocoyl Glycinate (SCG) serves as the flotation promoter. • SCG enhanced coal surface hydrophobicity. • Kerosene were emulsified into smaller droplets in presence of SCG. • SCG helped with stable forth layer during low-rank coal flotation. Low-rank coal flotation faces challenges due to its poor surface hydrophobicity. Massive oily collector, e.g. kerosene and diesel, are needed to improve its flotation performance, causing huge cost input. This study experimentally demonstrated that Sodium Cocoyl Glycinate (SCG), an amino acid surfactant, could help with obtaining higher efficiency when adopted in low-rank coal flotation. Results showed that compared with the condition using kerosene (5000 g/t) alone, a tiny amount of SCG (50 g/t) increased the concentrate yield by about 12%, while its ash content roughly remained the same. Effects of SCG on low-rank coal flotation was established from coal surface hydrophobicity, solution surface tension and the forth layer. The amphipathic groups of Sodium Cocoyl Glycinate would bond both with the hydrophilic and hydrophobic sites on the coal surface through hydrogen bonding, leaving the hydrophobic end exposed, which shorten the bubble-particle attachment time to about 100 ms. The decrease of solution’s surface tension was conducive to the emulsification of kerosene, making droplets diameter distribution into a smaller range of 0.26 to 10 μm. Meanwhile, lower surface tension offset the negative impact of oily collector, providing a more stable froth layer. Considering its hypotoxicity, biodegradability, environmental friendliness, Sodium Cocoyl Glycinate could be a green flotation promoter assisting with the conventional oily collectors.
Elsevier
Selective flotation separation of galena from sphalerite via chelation collectors with different nitrogen functional groups
Wang J., Ji Y., Cheng S., Liu S., Cao J., Chen P.
Applied Surface Science scimago Q1 wos Q1 , 
2021-12-01,  citations by CoLab: 16 ,  Abstract  
• Galena was collected by collectors with different nitrogen functional groups. • Nitrogen functional groups can selectively coordinate with the Pb 2+ . • N-riched collectors DPTZ can achieve effective separation of galena/sphalerite. Nitrogen functional groups often provide excellent collecting selectivity and efficiency for collector molecules because of the rational alkalinity as Lewis base and the delicate affinity for metal ions. In this work, 1,3-diphenylthiourea (DPTU), 2-acetylhydrazine-1-carbothioamide (ADCT), ( E )-1,5-diphenylthiocarbazone (DPTZ) were used as novel selective collectors for the flotation of galena/sphalerite mixed system, and universal collector sodium ethyl-xanthate (SEX) was used as the reference collector. The flotation results showed that collector with more nitrogen atoms (DPTZ) offered better selectivity for the flotation separation of galena from a galena/sphalerite mixed mineral system. Separation selectivity, FTIR and XPS studies showed, in the case that collector solution environment pH value < pK a value, N atoms did not participate in the coordination reaction. But in the opposite case, almost all N atoms in the collector molecule participated in the coordination reaction. As a result, there is stronger interaction between the collector molecule and the lead ion on the surface of galena, which was conducive to the selective flotation separation. The contact angle results showed that suitable hydrophobic groups were also critical to efficient separation.
Elsevier
Insight into mineral flotation fundamentals through the DFT method
Cui W., Chen J.
International Journal of Mining Science and Technology scimago Q1 wos Q1 Open Access , 
2021-11-01,  citations by CoLab: 72 ,  Abstract  
Flotation is a complex process that occurs in solid–liquid-gas multiphase systems, and its main factors include the minerals, separation medium, as well as various flotation reagents. The study of mineral properties and interactions with other components such as reagents and water lays the basic theoretical foundation for flotation. Density functional theory (DFT) calculations can qualitatively evaluate the exchange of matter and energy between the mineral system and the surroundings and quantitatively characterize these behaviors, which greatly expands the breadth and depth of flotation studies. This review systematically summarizes the advances of flotation research based on DFT studies, including the study of mineral crystal chemistry represented by the theory of lattice defects, mineral surface hydration such as hydrophilicity and hydrophobicity, surface regulation mechanism, and collecting mechanism based on surface adsorption theory. More significantly, it systematically elaborates different types of collectors according to their characteristics and emphatically explains the mechanism of some typical collectors in detail.
Elsevier
Flotation performance of a novel Gemini collector for kaolinite at low temperature
Zhang S., Huang Z., Wang H., Liu R., Cheng C., Shuai S., Hu Y., Guo Z., Yu X., He G., Fu W.
International Journal of Mining Science and Technology scimago Q1 wos Q1 Open Access , 
2021-11-01,  citations by CoLab: 67 ,  Abstract  
How to sustainably produce bauxite by effective reverse froth flotation of kaolinite at low temperature is an urgent problem to be solved in the field of mineral processing. In this work, a novel amino-based Gemini surfactant butadiyl-1, 4-bis (dimethyl dodecylammonium bromide) (BBDB) was prepared and first utilized as a novel collector for kaolinite flotation. Its flotation performance for kaolinite was compared with that of the common monomolecular surfactant 1-dodecylamine (DDA) by micro-flotation tests. The tests results indicated that 95% kaolinite recovery was obtained using 2.0 × 10 −4 mol/L BBDB at 25 ℃, which was half of the dosage when DDA obtained the maximum kaolinite recovery of 81%. At extremely low temperature (0 ℃), 3.0 × 10 −4 mol/L BBDB could still collect 91% kaolinite, while DDA showed a frustrating ability. The contact angle tests indicated that BBDB could still significantly improve the hydrophobicity of the kaolinite surface (contact angle 71.7°) than DDA (contact angle only 25.8°) at 0 ℃. The Krafft point comparison tests indicated that BBDB had a much lower Krafft point (below 0 ℃) than DDA. Fourier transform infrared spectroscopy (FTIR)-spectrum analysis and zeta potential measurements showed that BBDB was physically adsorbed on the surface of kaolinite through electrostatic interaction.
Elsevier
Studies of benzyl hydroxamic acid/calcium lignosulphonate addition order in the flotation separation of smithsonite from calcite
Liu C., Zhu Y., Huang K., Yang S., Liang Z.
International Journal of Mining Science and Technology scimago Q1 wos Q1 Open Access , 
2021-11-01,  citations by CoLab: 55 ,  Abstract  
Flotation separation of smithsonite from calcite is difficult due to their similar surface properties. In the present study, a reagent scheme of depressant calcium lignosulphonate (CLS) and collector benzyl hydroxamic acid (BHA) was introduced in the flotation of smithsonite from calcite. Microflotation tests revealed that the efficient flotation of smithsonite from calcite could only be obtained with the addition order of BHA before CLS, which was opposite to the widely-used order that adding depressant prior to the collector. The zeta potential measurements indicated that BHA selectively adsorbed onto smithsonite surface, then not allowed the CLS adsorption onto the smithsonite surface rather than calcite surface because of the steric hindrance, thereby the smithsonite surface remained hydrophobic while calcite surface became more hydrophilic after the addition of CLS. As a result, the calcite flotation was completely depressed while the smithsonite flotation recovery was still in high value, leading to the optimal flotation separation performance.
Elsevier
Hierarchically porous poly(amidoxime)/bacterial cellulose composite aerogel for highly efficient scavenging of heavy metals
Li H., Wang Y., Ye M., Zhang X., Zhang H., Wang G., Zhang Y.
Journal of Colloid and Interface Science scimago Q1 wos Q1 , 
2021-10-01,  citations by CoLab: 58 ,  Abstract  
Developing cheap, green, efficient and renewable adsorbents to address the issue of heavy metal pollution is highly desired for satisfying the requirements of economy sustainability and water security. Herein, a composite aerogel composed of bacterial cellulose (BC) and poly(amidoxime) (PAO) has been fabricated via a facile and scalable self-assembly and in situ oximation transformation for heavy metals removal. Benefiting from the unique three-dimensional (3D) interconnected porous architecture and high density of amidoxime functional moieties, the developed PAO/BC composite aerogel is capable of efficiently sequestrating heavy metals with exceptional sorption capacities, e.g. 571.5 mg g −1 for Pb 2+ , 509.2 mg g −1 for Cu 2+ , 494 mg g −1 for Zn 2+ , 457.2 mg g −1 for Mn 2+ , and 382.3 mg g −1 for Cd 2+ , outperforming most reported nano-adsorbents. Meanwhile, the sorption equilibrium for the investigated five heavy metals is achieved within 25 min with high removal efficiencies. Significantly, the developed PAO/BC composite aerogels possess superior reusability performance. Furthermore, the PAO/BC aerogels-packed column can continuously and effectively treat the simulated wastewater with multiple heavy metals coexisting to below the threshold value in the drinking water recommended by World Health Organization (WHO), highlighting its feasibility in the complex environmental water.
Elsevier
Separation of wolframite ore by froth flotation using a novel “crab” structure sebacoyl hydroxamic acid collector without Pb(NO3)2 activation
Zhang S., Huang Z., Wang H., Liu R., Cheng C., Guo Z., Yu X., He G., Fu W.
Powder Technology scimago Q1 wos Q2 , 
2021-09-01,  citations by CoLab: 52 ,  Abstract  
In this study, a new hydroxamic-acid molecule - sebacoyl hydroxamic acid (SHA) was synthesized and characterized. It was the first time that SHA with dual hydroxamic acid groups of “crab” structure was used as a collector for wolframite flotation, and its collecting ability was compared with the traditional collector benzohydroxamic acid (BAH) in the presence or absence of lead ions. In micro-flotation experiments, the wolframite recovery using 4 × 10 −4 mol/L SHA collector alone was 30% higher than that using 4 × 10 −4 mol/L BHA collector and 1 × 10 −4 mol/L Pb(NO 3 ) 2 activator. The results of bench-scale flotation experiments showed that the WO 3 recovery of wolframite concentrate with 180 g/t SHA was 10.05% higher than that with 360 g/t BHA and 300 g/t Pb(NO 3 ) 2 . Therefore, using SHA collector with “crab” structure for wolframite flotation can not only improve the separation index at a low dosage, but also eliminate the use of Pb(NO 3 ) 2 . The schematic illustration of the flotation separation process. • A novel surfactant sebacoyl hydroxamic acid (SHA) was synthesized. • SHA with a “crab” structure was first used as a collector for wolframite flotation. • SHA without Pb(II) ions had a stronger collecting ability than benzohydroxamic acid. • Using SHA collector improved the separation index and increased the economic benefit.
New insights into separating wolframite from calcium bearing minerals by flotation
Lu Y., Wang S., Zhong H.
Journal of Industrial and Engineering Chemistry scimago Q1 wos Q1 , 
2021-05-01,  citations by CoLab: 15 ,  Abstract  
Wolframite is often associated with calcium bearing minerals, leading to low grade, while conventional anionic collectors are hard to realize their efficient flotation separation, thus the effective structural modification of cationic collectors provides a new insight into enhancing the comprehensive development of wolframite resources. In this study, a surfactant 3-dodecyloxy propyl amidoxime (DOPA) was designed and first used as the collector in flotation separation of wolframite from fluorite and calcite. Computational calculations basically proved the correctness of predictions about the performances of DOPA. Micro-flotation tests indicated that compared to DDA and conventional anionic collector benzohydroxamic acid (BHA), DOPA possessed superior collecting ability to wolframite and excellent selectivity against fluorite and calcite at low concentration, with no frother or activator employed, which is supposed to be an efficient collector for separating wolframite from calcium bearing minerals. The separation mechanisms of DOPA between wolframite and fluorite/calcite were further probed, revealing that besides the electrostatic attraction between DOPA and wolframite, DOPA could chemisorb onto wolframite surfaces by forming five-membered ring toward the surface cation site Fe or Mn, with no significant interaction observed on fluorite/calcite surfaces, resulting to the excellent separation performance.
American Chemical Society (ACS)
Supramolecularly Poly(amidoxime)-Loaded Macroporous Resin for Fast Uranium Recovery from Seawater and Uranium-Containing Wastewater
Wen S., Sun Y., Liu R., Chen L., Wang J., Peng S., Ma C., Yuan Y., Gong W., Wang N.
ACS applied materials & interfaces scimago Q1 wos Q1 , 
2021-01-07,  citations by CoLab: 104 ,  Abstract  
Uranium is an extremely abundant resource in seawater that could supply nuclear fuel for over the long-term, but it is tremendously difficult to extract. Here, a new supramolecular poly(amidoxime) (PAO)-loaded macroporous resin (PLMR) adsorbent has been explored for highly efficient uranium adsorption. Through simply immersing the macroporous resin in the PAO solution, PAOs can be firmly loaded on the surface of the nanopores mainly by hydrophobic interaction, to achieve the as-prepared PLMR. Unlike existing amidoxime-based adsorbents containing many inner minimally effective PAOs, almost all the PAOs of PLMR have high uranium adsorption efficiency because they can form a PAO-layer on the nanopores with molecular-level thickness and ultrahigh specific surface area. As a result, this PLMR has highly efficient uranium adsorbing performance. The uranium adsorption capacity of the PLMR was 157 mg/g (the UPAO in the PLMR was 1039 mg/g), in 32 ppm uranium-spiked seawater for 120 h. Additionally, uranium in 1.0 L 100 ppb U-spiked both water and seawater can be removed quickly and the recovery efficiency can reach 91.1 ± 1.7% and 86.5 ± 1.9%, respectively, after being filtered by a column filled with 200 mg PLMR at 300 mL/min for 24 h. More importantly, after filtering 200 T natural seawater with 200 g PLMR for only 10 days, the uranium-uptake amount of the PLMR reached 2.14 ± 0.21 mg/g, and its average uranium adsorption speed reached 0.214 mg/(g·day) which is very fast among reported amidoxime-based adsorbents. This new adsorbent has great potential to quickly and massively recover uranium from seawater and uranium-containing wastewater. Most importantly, this work will provide a simple but general strategy to greatly enhance the uranium adsorption efficiency of amidoxime-functionalized adsorbents with ultrahigh specific surface area via supramolecular interaction, and even inspire the exploration of other adsorbents.
Found 45
By date By citations
Elsevier
Unveiling the potential of metal-organic framework-based membranes: Transforming material science for a sustainable future
Abboud M., Chaouiki A., Chafiq M., Fatimah S., Elboughdiri N., Kang J., Gun Ko Y.
Separation and Purification Technology scimago Q1 wos Q1 , 
2025-07-01,  citations by CoLab: 1 , 
Elsevier
Synthesis of sulfomethylated depolymerized alkali lignin and its application in scheelite flotation
Yang X., Bao J., Liu Z., Wu D., Cao Y., Xu C.C., Hao H., Zhang Y.
Journal of Molecular Liquids scimago Q1 wos Q1 , 
2025-04-01,  citations by CoLab: 0 , 
Elsevier
Dodecyl amine adsorption on the TiO2 (0 0 1) surface and its effect on the surface wettability: A molecular dynamics study
Hashemi S., Noaparast M., Mabudi A.
Journal of Molecular Liquids scimago Q1 wos Q1 , 
2025-03-01,  citations by CoLab: 0 , 
Elsevier
Amidoxime collectors: Lead-free flotation performance and adsorption mechanism in the separation of wolframite, quartz and calcite
Zeng G., Weng W., Zhong S., Chi X., Cai J., Tan W., Chen J.
Minerals Engineering scimago Q1 wos Q1 , 
2025-03-01,  citations by CoLab: 1 , 
Elsevier
Efficient lead-free flotation separation of malachite from calcite and quartz by using amidoxime collectors
Cheng C., Zeng G., Huang Z.
Colloids and Surfaces A: Physicochemical and Engineering Aspects scimago Q1 wos Q2 , 
2025-03-01,  citations by CoLab: 0 , 
Elsevier
Direct flotation recovery of malachite using a novel N-substituted hydroxamic acid: Adsorption mechanism and DFT calculation
Wu K., Lu Y., Wang S., Ma X., Zhong H.
Minerals Engineering scimago Q1 wos Q1 , 
2025-03-01,  citations by CoLab: 0 , 
Elsevier
Synthesis and utilization of a novel amidoxime collector for the flotation separation of cuprite from calcite
Li Q., Huang L., Hu B., Huang S., Zhou J., Xu Y.
Separation and Purification Technology scimago Q1 wos Q1 , 
2025-01-01,  citations by CoLab: 3 ,  Abstract  
In this study, a novel copper oxide flotation collector, p-methylphenylethyl amide oxime (PEBH), was synthesized via the nitrile–hydroxylamine method, and the flotation behavior of cuprite and calcite under this collector system was studied. The oxime groups of the collector provided additional action sites to form stable chelates with metal ions. The performance of PEBH in cuprite ore flotation was investigated via contact angle measurement, zeta potential measurement, Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and calculations based on the EDLVO (extended Derjaguin, Landau, Verwey, and Overbeek) theory. The flotation experiments of single minerals and artificial mixed minerals indicated that PEBH has excellent flotation ability. At pH 11 and PEBH concentration of 2 × 10−4 mol/L, the cuprite recovery is as high as 96.84 %. Under alkaline conditions of pH 9.0 and 11.0, it can effectively separate cuprite from calcite. Contact angle measurements showed that PEBH significantly enhanced the surface hydrophobicity of cuprite. Zeta potential, FTIR spectroscopy, and XPS analyses revealed the selective chemical adsorption of PEBH onto the Cu sites of cuprite. The results of EDLVO theory-based calculations further confirmed after PEBH action, the attraction between cuprite and bubbles significantly increased, which is beneficial to cuprite flotation. Overall, the results demonstrate that PEBH is a potential collector for the flotation separation of cuprite from calcite.
Elsevier
Synergistic effect and mechanism of ferric ion modified citric acid depressant in the flotation separation of scheelite from cassiterite
Zheng Q., Dong L., Shen P., Liu D.
Separation and Purification Technology scimago Q1 wos Q1 , 
2025-01-01,  citations by CoLab: 6 ,  Abstract  
Scheelite and cassiterite often coexist in skarn deposits, which are prone to excessive crushing during dissociation, and gravity separation faces a challenge. However, research on flotation separation is limited. This study aimed to investigate the selective depression behavior and depression mechanism of a combined depressant containing ferric chloride and citric acid on cassiterite to successfully achieve the flotation separation of scheelite and cassiterite. Experimental studies on single minerals and artificially mixed minerals indicated that the individual ferric chloride or citric acid exhibited weak depressive abilities and poor selectivity toward cassiterite. However, a combination of ferric chloride and citric acid in a mass ratio of 3:7 achieved better separation results. At a pH of 8, with a concentration of 1 × 10–3 mol/L mixed depressant, and a sodium oleate concentration of 5 × 10–5 mol/L, scheelite and cassiterite exhibited recovery of 73.35 % and 19.98 %, with grades of 61.76 % and 16.18 %, respectively. Fourier–transform infrared spectroscopy and X–ray photoelectron spectroscopy analyses revealed that the mixed depressant strongly chemically adsorbed on the cassiterite surface, forming FeOOH at ferric species sites. Contact angle measurements indicated a significant reduction in surface hydrophobicity of the cassiterite surface due to mixed depressant components. Atomic force microscopy imaging analysis elucidated the adsorption morphology of the mixed depressant depressive component FeOOH on the cassiterite surface in both 2D and 3D imaging, indicating abundant high–intensity reagent peak adsorption. Therefore, the mixed depressant enhanced the selectivity of the depressant, facilitating the effective separation of scheelite and cassiterite.
Elsevier
Investigation of the effect and mechanism on the flotation performance of alkylglycine-based collectors by acyl group
Liu W., Ge R., Bao L., Liu W., Shen Y., Zhao S., Zhao Q.
Minerals Engineering scimago Q1 wos Q1 , 
2024-11-01,  citations by CoLab: 1 , 
Elsevier
Flotation separation scheelite from calcite by using a novel depressant of Poly(sodium 4-styrenesulfonate)
Chen J., Gao P., Liu J., Zhu Y.
Advanced Powder Technology scimago Q1 wos Q2 , 
2024-11-01,  citations by CoLab: 0 , 
Springer Nature
Efficient desorption and reuse of collector from the flotation concentrate: A case study of scheelite
Tao L., Wang J., Liao D., Jia W., Zhao Z., Che W., Qi Z., Sun W., Gao Z.
International Journal of Minerals, Metallurgy and Materials scimago Q1 wos Q1 , 
2024-10-09,  citations by CoLab: 0 ,  Abstract  
Flotation is the most common method to obtain concentrate through the selective adsorption of collectors on target minerals to make them hydrophobic and floatable. In the hydrometallurgy of concentrate, collectors adsorbed on concentrate can damage ion-exchange resin and increase the chemical oxygen demand (COD) value of wastewater. In this work, we proposed a new scheme, i.e., desorbing the collectors from concentrate in ore dressing plant and reusing them in flotation flowsheet. Lead nitrate and benzohydroxamic acid (Pb-BHA) complex is a common collector in scheelite flotation. In this study, different physical (stirring or ultrasonic waves) and chemical (strong acid or alkali environment) methods for facilitating the desorption of Pb-BHA collector from scheelite concentrate were explored. Single-mineral desorption tests showed that under the condition of pulp pH 13 and ultrasonic treatment for 15 min, the highest desorption rates of Pb and BHA from the scheelite concentrate were 90.48% and 63.75%, respectively. Run-of-mine ore flotation tests revealed that the reuse of desorbed Pb and BHA reduced the collector dosage by 30% for BHA and 25% for Pb. The strong alkali environment broke the chemical bonds between Pb and BHA. The cavitation effect of ultrasonic waves effectively reduced the interaction intensity between Pb-BHA collector and scheelite surfaces. This method combining ultrasonic waves and strong alkali environment can effectively desorb the collectors from concentrate and provide “clean” scheelite concentrate for metallurgic plants; the reuse of desorbed collector in flotation flowsheet can reduce reagent cost for ore dressing plants.
Elsevier
Exploring a clean organic carboxylic acid depressant for flotation separation of tungsten-tin minerals
Zheng Q., Dong L., Shen P., Liu D.
Journal of Environmental Chemical Engineering scimago Q1 wos Q1 , 
2024-10-01,  citations by CoLab: 2 , 
Elsevier
Enhanced termination of zinc and cadmium ions from wastewater employing plain and chitosan-modified mxenes: Synthesis, characterization, and adsorption performance
Azeez N.R., Salih S.S., Kadhom M., Mohammed H.N., Ghosh T.K.
Green Chemical Engineering scimago Q1 wos Q1 Open Access , 
2024-09-01,  citations by CoLab: 15 ,  Abstract  
Zinc and cadmium pollutants cause a significant environmental effect that cannot be ignored. Due to their considerable amount in an aqueous environment, industries are seeking suitable adsorbents that are environmentally friendly and inexpensive for removing metals from wastewater before disposing of them in surface waters. This research employed original MXene (MX) and chitosan-modified MXene (CSMX) to extract zinc (Zn(II)) and cadmium (Cd(II)) metal ions from water-based solutions. The composite material produced was analyzed using techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET). The effects of contact duration, pH of the solution, and initial concentration of metal ions on the adsorption process of zinc and cadmium onto both MX and CSMX composites were investigated. MXene and prepared CSMX composite presented a high adsorption capacity for both studied heavy metals, which were 91.55 and 73.82 mg/g for Zn(II) and Cd(II) onto MX, 106.84 and 93.07 mg/g for Cd(II) and Zn(II) onto CSMX composite, respectively. Furthermore, the maximum competitive adsorption capacities for Zn(II) onto MX and CSMX composites are 77.29 and 93.47 mg/g, and for Cd(II) 60.30 and 79.66 mg/g, respectively. Hence, the removal capacities for both single and competitive metal ions were superior to CSMX composite. However, the adsorption capacities after five successive regeneration sequences were only dropped by 13.2% for Zn(II) and 17.4% for Cd(II) onto the CSMX composite compared to the first cycle. These results confirm that both metals could be efficiently terminated from wastewater, which makes the prepared CSMX composite a favorable candidate adsorbent in practical applications.
Elsevier
Metal ions modified small molecule organic inhibitor to achieve efficient flotation separation of scheelite from calcite
Qiao L., Dong L., Zhang T., Shen P., Liu D.
Advanced Powder Technology scimago Q1 wos Q2 , 
2024-08-01,  citations by CoLab: 1 , 
Elsevier
Flotation performance and adsorption mechanism of α-hydroxyoctyl phosphinic acid to pyrochlore
Wang H., Zhong H., Li F., Meng Q., Wu D., Li S.
Minerals Engineering scimago Q1 wos Q1 , 
2024-07-01,  citations by CoLab: 3 ,  Abstract  
The flotation performance and adsorption mechanism of α-hydroxyoctyl phosphinic acid (HPA) on pyrochlore were investigated through micro-flotation experiments, zeta-potential tests, contact angle measurements and XPS analysis. The flotation results demonstrated that, in comparison to N-hexadecylpropane-1,3-diamine (NHDA), HPA exhibited a comparable collecting ability for pyrochlore but displayed superior selectivity against feldspar and quartz. Adsorption experiments revealed that the pyrochlore exhibited a higher adsorption capacity for HPA compared to feldspar and quartz. The contact angle experiments indicated that the treatment with HPA significantly increased the contact angle for pyrochlore and calcite, while only minimal changes were observed for feldspar and quartz. Zeta potential and XPS data provided evidence for the chemical adsorption of HPA onto pyrochlore surfaces. Detailed XPS results showed that P-OH groups in HPA formed P(III)-O-M (M = Ca and Nb) bonds with Ca and Nb species on the pyrochlore surface. Additionally, the P-H bond in the HPA molecule could undergo a Redox reaction with highly oxidized Nb, resulting in the formation of a P(V)-Nb(IV) bond. This P(V)-Nb(IV) bond enhances the adsorption of hydrophobic HPA onto the mineral, making it easier to recover pyrochlore through flotation.

Top-30

Journals

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Separation and Purification Technology
Separation and Purification Technology, 7, 15.56%
Minerals Engineering
Minerals Engineering, 7, 15.56%
Journal of Molecular Liquids
Journal of Molecular Liquids, 4, 8.89%
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 4, 8.89%
Langmuir
Langmuir, 2, 4.44%
Molecules
Molecules, 2, 4.44%
International Journal of Minerals, Metallurgy and Materials, 2, 4.44%
Advanced Powder Technology
Advanced Powder Technology, 2, 4.44%
Separations
Separations, 1, 2.22%
Tungsten
Tungsten, 1, 2.22%
Journal of Cleaner Production
Journal of Cleaner Production, 1, 2.22%
New Journal of Chemistry
New Journal of Chemistry, 1, 2.22%
Green Chemical Engineering
Green Chemical Engineering, 1, 2.22%
Powder Technology
Powder Technology, 1, 2.22%
Chemical Engineering Science
Chemical Engineering Science, 1, 2.22%
Minerals
Minerals, 1, 2.22%
Materials
Materials, 1, 2.22%
Science of the Total Environment
Science of the Total Environment, 1, 2.22%
Journal of Materials Research and Technology
Journal of Materials Research and Technology, 1, 2.22%
Chemical Physics Impact
Chemical Physics Impact, 1, 2.22%
Journal of Central South University
Journal of Central South University, 1, 2.22%
Applied Surface Science
Applied Surface Science, 1, 2.22%
Journal of Environmental Chemical Engineering
Journal of Environmental Chemical Engineering, 1, 2.22%
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Publishers

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Elsevier
Elsevier, 33, 73.33%
MDPI
MDPI, 5, 11.11%
Springer Nature
Springer Nature, 3, 6.67%
American Chemical Society (ACS)
American Chemical Society (ACS), 2, 4.44%
Royal Society of Chemistry (RSC)
Royal Society of Chemistry (RSC), 1, 2.22%
University of Science and Technology Beijing, 1, 2.22%
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