Separation and Purification Technology, volume 269, pages 118716

Magnetic separation of water suspensions containing TiO2 photocatalytic nanoparticles

Bahtejeva Irina ¹

MEDVEDEVA I.V. ^{1, 2}

Zhakov S V ¹

Byzov I V ¹

Filinkova M S ¹

Uimin M.A. ^{1, 3}

Murzakaev A.M. ^{3, 4}

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M. N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi, 620108 Ekaterinburg, Russian Federation |

Ural State Mining University, ul. Kuibysheva, 620014 Ekaterinburg, Russian Federation |

Ural Federal University, ul. Mira, 620002 Ekaterinburg, Russian Federation |

⁴

Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, ul. Amundsena, 620016 Ekaterinburg, Russian Federation |

Publication type: Journal Article

Publication date: 2021-08-01

Elsevier

Journal: Separation and Purification Technology

Quartile SCImago

Quartile WOS

Impact factor: 8.6

ISSN: 13835866, 18733794

DOI: 10.1016/j.seppur.2021.118716

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Analytical Chemistry

Filtration and Separation

Abstract

• TiO 2 nanoparticles were separated from water by magnetically seeded filtration and sedimentation. • Heteroaggregation of the TiO 2 nanoparticles and the magnetic Fe-C-COOH nanoseeds is a key factor. • The magnetic separation is tuned by changing pH and the particle concentration in water. • Magnetic filtration is a more effective process than magnetic sedimentation. The dynamics of magnetic separation of TiO 2 nanoparticles (25 nm) from water by adding composite magnetic Fe-C-COOH nanoparticles (15 nm) and subsequent magnetic sedimentation or magnetic filtration has been studied. Magnetic sedimentation was carried out in a gradient magnetic field (H max = 0.3 T, (gradH) max = 0.13 T / m), and magnetic filtration (H max = 0.5 T, (gradH) max ~ 10 5 T / m) was carried out in a column bench filter with a steel wool magnetic matrix. The applied methods of spectrophotometry using the PLS algorithm and nuclear relaxometry made it possible to determine the partial concentrations of the target TiO 2 particles and of the magnetic seeds in water. Oppositely charged target TiO 2 nanoparticles and magnetic Fe-C-COOH nanoparticles formed heteroaggregates in water, the size of which depended on the pH of the aqueous medium, on the ratio of their concentrations, and on the concentration of the solid phase in water. The maximum efficiency of TiO 2 separation from water by both methods was observed at pH = 6, at which the electric charge of the aggregates was minimal. The largest heteroaggregates (with d h ~ 3 μm) are formed at initial concentrations of TiO 2 nanoparticles of 0.1–0.5 g / l and at the 2:1 mass ratio of the nonmagnetic and magnetic components. Magnetic filtration is a more efficient separation process than magnetic sedimentation due to higher magnetic field gradients applied. It was found that by adding Fe-C-COOH magnetic nanoseeds, the magnetic filtration at a flow rate of 7 * 10 -3 m / s through a filter of the 50 cm length, leads to the reduction of the TiO 2 concentration in water from 0.5 g / l to 3 * 10 -4 g / l for 10 min. The results obtained can serve as a basis for designing a magnetic separation unit in photocatalytic reactors for water purification.

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Journal of Alloys and Compounds	Journal of Alloys and Compounds, 1, 20% Journal of Alloys and Compounds 1 publication, 20%
Separation Science and Technology	Separation Science and Technology, 1, 20% Separation Science and Technology 1 publication, 20%
Izvestiya Vysshikh Uchebnykh Zavedenii, Seriya Khimiya i Khimicheskaya Tekhnologiya	Izvestiya Vysshikh Uchebnykh Zavedenii, Seriya Khimiya i Khimicheskaya Tekhnologiya, 1, 20% Izvestiya Vysshikh Uchebnykh Zavedenii, Seriya Khimiya i Khimicheskaya Tekhnologiya 1 publication, 20%
Catalysts	Catalysts, 1, 20% Catalysts 1 publication, 20%
Applied Biochemistry and Biotechnology	Applied Biochemistry and Biotechnology, 1, 20% Applied Biochemistry and Biotechnology 1 publication, 20%
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Elsevier	Elsevier, 1, 20% Elsevier 1 publication, 20%
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Ivanovo State University of Chemistry and Technology	Ivanovo State University of Chemistry and Technology, 1, 20% Ivanovo State University of Chemistry and Technology 1 publication, 20%
Multidisciplinary Digital Publishing Institute (MDPI)	Multidisciplinary Digital Publishing Institute (MDPI), 1, 20% Multidisciplinary Digital Publishing Institute (MDPI) 1 publication, 20%
Springer Nature	Springer Nature, 1, 20% Springer Nature 1 publication, 20%
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Bahtejeva I. et al. Magnetic separation of water suspensions containing TiO2 photocatalytic nanoparticles // Separation and Purification Technology. 2021. Vol. 269. p. 118716.

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Bahtejeva I., MEDVEDEVA I., Zhakov S. V., Byzov I. V., Filinkova M. S., Uimin M., Murzakaev A. Magnetic separation of water suspensions containing TiO2 photocatalytic nanoparticles // Separation and Purification Technology. 2021. Vol. 269. p. 118716.

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RIS Copy

TY - JOUR

DO - 10.1016/j.seppur.2021.118716

UR - https://doi.org/10.1016%2Fj.seppur.2021.118716

TI - Magnetic separation of water suspensions containing TiO2 photocatalytic nanoparticles

T2 - Separation and Purification Technology

AU - Bahtejeva, Irina

AU - MEDVEDEVA, I.V.

AU - Zhakov, S V

AU - Byzov, I V

AU - Filinkova, M S

AU - Uimin, M.A.

AU - Murzakaev, A.M.

PY - 2021

DA - 2021/08/01 00:00:00

PB - Elsevier

SP - 118716

VL - 269

SN - 1383-5866

SN - 1873-3794

ER -

BibTex

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@article{2021_Bahtejeva,

author = {Irina Bahtejeva and I.V. MEDVEDEVA and S V Zhakov and I V Byzov and M S Filinkova and M.A. Uimin and A.M. Murzakaev},

title = {Magnetic separation of water suspensions containing TiO2 photocatalytic nanoparticles},

journal = {Separation and Purification Technology},

year = {2021},

volume = {269},

publisher = {Elsevier},

month = {aug},

url = {https://doi.org/10.1016%2Fj.seppur.2021.118716},

pages = {118716},

doi = {10.1016/j.seppur.2021.118716}

}

Found error?

Publisher

Elsevier

Journal

Separation and Purification Technology

Quartile SCImago

Quartile WOS

Impact factor

8.6

ISSN

13835866 (Print)
18733794 (Electronic)

Labs

Laboratory of Applied Magnetism

Profiles

Uimin, Mikhail A