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Azurobine Degradation Using Fe2o3@Multi-Walled Carbon Nanotube Activated Peroxymonosulfate (Pms) Under Uva-Led Irradiation: Performance, Mechanism and Environmental Application Publisher



Madihibidgoli S1 ; Asadnezhad S2 ; Yaghootnezhad A3 ; Hassani A4
Authors
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Authors Affiliations
  1. 1. Research Center for Environmental Contaminants (RCEC), Abadan University of Medical Sciences, Abadan, Iran
  2. 2. Division of Food Safety and Hygiene, Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Chemical Engineering, Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, 63187–14331, Iran
  4. 4. Department of Materials Science and Nanotechnology Engineering, Faculty of Engineering, Near East University, 99138 Nicosia, TRNC, Mersin, 10, Turkey

Source: Journal of Environmental Chemical Engineering Published:2021


Abstract

Food dyes are a large group of dyes which have been widely used in the food industry. The presence of them in aquatic media results in water pollution. In this work, a heterogeneous photo-assisted peroxymonosulfate (PMS) activation process was used to degrade Azorubine (AZB). Fe2O3 loaded on multi-wall carbon nanotube (Fe@MWCNT) was synthesized and applied to activate PMS under UVA-LED irradiation. Fe@MWCNT catalyst was characterized by XRD, FTIR, EDX-map, BET, FESEM, and TEM analyses. UVA-LED/Fe@MWCNT/PMS process removed around 95% of AZB from aqueous solution under pH= 5, PMS= 1.8 mM, and 130 mg/L Fe@MWCNT. Sulfate radicals showed a higher contribution for AZB degradation compared to hydroxyl radicals and singlet oxygen. Pseudo-first-order model was fitted on AZB degradation with a rate constant of 0.095 min−1. Bicarbonate ions and humic acid had an ultra-inhibitory effect on the oxidative process. Carboxylic acids were monitored during AZB degradation, with the results indicating that aromatic rings of AZB were opened by the attack of sulfate and hydroxyl radicals. Six cycles of the catalyst reuse demonstrated no significant change in the performance of the UVA-LED/Fe@MWCNT/PMS process. The implementation of the UVA-LED/Fe@MWCNT/PMS process was also successfully studied on other food dyes and real wastewater. UVA-LED/Fe@MWCNT/PMS process was an efficient approach for the degradation of organic contaminants in water with high stability. © 2021 Elsevier Ltd
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