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Open AccessFeature PaperArticle

Catalytic Oxidation of Methylene Blue by Use of Natural Zeolite-Based Silver and Magnetite Nanocomposites

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Environmental Science & Technology Group (ESTg), Department of Chemical & Materials Engineering, School of Engineering & Digital Sciences, Nazarbayev University, Nur-Sultan 020000, Kazakhstan
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The Environment & Resource Efficiency Cluster (EREC), Nazarbayev University, Nur-Sultan 010000, Kazakhstan
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Department of Environmental Engineering & Management, L.N.Gumilyov Eurasian National University, Nur-Sultan 02000, Kazakhstan
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School of Life Science, Pharmacy & Chemistry, Kingston University, Penrhyn Road, London KT1 2EE, UK
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Authors to whom correspondence should be addressed.
Processes 2020, 8(4), 471; https://doi.org/10.3390/pr8040471
Received: 21 January 2020 / Revised: 25 February 2020 / Accepted: 27 February 2020 / Published: 16 April 2020
(This article belongs to the Special Issue Sustainable Remediation Processes Based on Zeolites)
This work reports the synthesis of natural zeolite-based silver and magnetite nanocomposites and their application for the catalytic oxidation of methylene blue in water. The zeolite was impregnated with 5.5 wt.% Fe in the form of magnetite nanoparticles with size of 32 nm, and with 6.4 wt.% Ag in the form of silver oxide and metallic silver nanoparticles with sizes of 42 and 20 nm, respectively. The results showed that physical adsorption contributed to the removal of methylene blue by 25–36% and that Fe3O4@NZU is superior to Ag2[email protected] and Ag0@NZU, leading to 55% removal without oxidant and 97% in the presence of H2O2. However, there is no evidence of significant mineralization of methylene blue. The application of reaction rate models showed that the reaction order changes from zero to first and second order depending on the H2O2 concentration. View Full-Text
Keywords: zeolites; clinoptilolite; methylene blue; oxidation; nanoparticles; silver; silver oxide; magnetite zeolites; clinoptilolite; methylene blue; oxidation; nanoparticles; silver; silver oxide; magnetite
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MDPI and ACS Style

Kuntubek, A.; Kinayat, N.; Meiramkulova, K.; Poulopoulos, S.G.; Bear, J.C.; Inglezakis, V.J. Catalytic Oxidation of Methylene Blue by Use of Natural Zeolite-Based Silver and Magnetite Nanocomposites. Processes 2020, 8, 471.

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