FeVO4 as a highly active heterogeneous Fenton-like catalyst towards the degradation of Orange II |
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| Affiliation: | 1. Department of Water and Sanitation, Private Bag X1106, University of Limpopo, Sovenga 0728, South Africa;2. Department of Chemistry, Private Bag X1106, University of Limpopo, Sovenga 0728, South Africa;3. Department of Physics, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa;4. Centre for Nanostructures and Advanced Materials (CeNAM), Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa;5. Department of Chemistry, University of the Western Cape, Private Bag X17, Robert Sobukwe Drive, Bellville 7535, South Africa;1. Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;2. Physics Department, Faculty of Science, Amran University, Yemen;3. Chemistry Department, Faculty of Science, Amran University, Yemen;1. South China Institute of Environmental Sciences, Ministry of Environmental Protection (MEP), Guangzhou 510655, PR China;2. Innovative Laboratory for Environmental Functional Materials and Environmental Applications of Microwave Irradiation, South China Subcenter of State Environmental Dioxin Monitoring Center, Guangzhou 510655, PR China;3. Guangdong Key Laboratory of Agro-Environment Integrated Control, South China Institute of Environmental Sciences, Guangzhou 510655, PR China;4. Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering (DBCEE), University of Cincinnati, Cincinnati, Ohio, 45221-0012, USA |
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| Abstract: | The iron vanadate, FeVO4, was prepared and characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM). It was found that FeVO4 could effectively catalyze H2O2 to generate active hydroxyl radical  OH, which was confirmed with electron spin resonance (ESR) spin-trapping technique. Therefore, it was employed as a heterogeneous Fenton-like catalyst in the present contribution, and its catalytic activity was mainly evaluated in terms of the degradation efficiency of Orange II. Compared with the conventional heterogeneous Fenton-like catalysts, α-Fe2O3, Fe3O4 and γ-FeOOH, FeVO4 possessed a much higher catalytic activity. The high catalytic activity possibly involved in a special two-way Fenton-like mechanism, that is, the activation of H2O2 by both Fe(III) and V(V) in FeVO4. Moreover, FeVO4 possessed a wide applicable pH range and its catalytic activity was slightly affected by the solution pH values in the range of 3–8. |
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