Application of Fe 2 O 3 /CeO 2 nanocomposites for the purification of aqueous media
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Application of Fe2O3/CeO2 nanocomposites for the purification of aqueous media K. Egizbek1,2 · A. L. Kozlovskiy1,2 · K. Ludzik4,5 · M. V. Zdorovets1,2,3 · M. A. Ibragimova1,2 · B. Marciniak6 · M. Jazdzewska4,7 · D. Chudoba4,7,8 · A. Nazarova1,4 · R. Kontek6 Received: 27 April 2020 / Accepted: 22 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The paper presents the results of a study of the applicability of Fe2O3/CeO2 nanoparticles for purification of aqueous media from manganese ions, by its absorption on the surface of nanoparticles, with further removal from the aqueous medium by magnetic separation. According to the data obtained, the structures under study are a mixture of two phases: the rhombohedral phase Fe2O3, which is characteristic of the hematite structure, and the hexagonal phase CeO2 with a phase ratio of 1:2. During corrosion tests, it was found that acid solutions with pH = 1 and 0.1% HCl, which varies from 0.0004 to 0.0007 nm/day, have the highest degradation rate and a decrease in the degree of ordering of the crystal structure of nanoparticles. Moreover, in the case of corrosion tests in PBS solutions, the degradation rate was 0.0002 nm/day. According to the data obtained, it was found that the absorption of manganese ions on the surface of nanoparticles leads to the formation of highly disordered or amorphous-like inclusions. In this case, an increase in the residence time in the medium leads to partial degradation of the nanoparticles, which leads to a decrease in the degree of purification. Keywords Nanoparticles · Chemical precipitation · Purification of aqueous media · Degradation · Oxide structures
1 Introduction
* A. L. Kozlovskiy [email protected] 1
L.N.Gumilyov Eurasian National University, Satpaev Str. 5, 010008 Nur‑Sultan, Kazakhstan
2
The Institute of Nuclear Physics, Ibragimov Str., 1, 050032 Almaty, Kazakhstan
3
Ural Federal University, Mira Str. 19, Ekaterinburg, Russia 620002
4
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia
5
Department of Physical Chemistry, University of Lodz, Lodz, Poland
6
Laboratory of Cytogenetics, Faculty of Biology and Enviromental Protection, University of Lodz, Lodz, Poland
7
Faculty of Physics, University Adam Mickiewicz, Poznan, Poland
8
Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia
Over the past decade, in connection with the accelerated process of industrial development and technological progress, more and more attention is paid to the problems of pollution and poisoning by harmful and toxic metals, industrial wastes, processing of secondary raw materials, etc. In order to increase the efficiency of various methods of cleaning or filtering aqueous media with a high content of harmful elements, advanced technologies are increasingly used using nanostructured materials or devices based on them [1–7]. Nanostructured materials or ceramics are increasingly finding their practical application and displacing mass
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