Influence of the Active Phase (Fe, Ni, and Ni–Fe) of Mixed Oxides in CWAO of Crystal Violet

Archila, Katherine, Campos, Ana María, Lugo, Lorena, Celis, Crispín Astolfo, Moreno, Sonia, Reina, Tomas Ramirez and Pérez-Flórez, Alejandro (2020) Influence of the Active Phase (Fe, Ni, and Ni–Fe) of Mixed Oxides in CWAO of Crystal Violet Catalysts, 10 (9).

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Abstract

The catalytic oxidation of aqueous crystal violet (CV) solutions was investigated using Ni and Fe catalysts supported over Mg–Al oxides synthesized by the autocombustion method. The influence of temperature, loading, and selectivity were studied in the catalytic wet air oxidation (CWAO) of CV. The kind of metal had an important contribution in the redox process as significant differences were observed between Fe, Ni, and their mixtures. The catalysts with only Fe as active phase were more efficient for the oxidation of CV under normal conditions (T = 25 °C and atmospheric pressure) compared to those containing Ni, revealing the influence of the transition metal on catalytic properties. It was found that iron-containing materials displayed enhanced textural properties. The synthesis of Fe/MgAl catalysts by the autocombustion method led to solids with excellent catalytic behavior, 100% CV degradation in eight hours of reaction, 68% selectivity to CO₂, and significant reduction of chemical oxygen demand (COD).

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :	Name Email ORCID Archila, Katherine Campos, Ana María Lugo, Lorena Celis, Crispín Astolfo Moreno, Sonia Reina, Tomas Ramirez t.ramirezreina@surrey.ac.uk Pérez-Flórez, Alejandro
Date :	14 September 2020
DOI :	10.3390/catal10091053
Copyright Disclaimer :	© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords :	Crystal violet; CWAO; Autocombustion method; Dye; Water treatment
Related URLs :	Publisher
Depositing User :	Clive Harris
Date Deposited :	14 Sep 2020 10:26
Last Modified :	14 Sep 2020 10:26
URI:	http://epubs.surrey.ac.uk/id/eprint/858576

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