Title: Improved degradation of Orange II by Fe₃O₄/NiO/NaHSO₃ system under visible light irradiation

Authors: Yu Mei; Bin Zhou; Jianfeng Ma; Xinyu Zhang

Addresses: Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310005, China ' Zhejiang Environmental Monitoring Engineering Co. Ltd., Hangzhou, 310012, China ' School of Environmental and Safety Engineering, Changzhou University, Jiangsu, 213164, China ' School of Environmental and Safety Engineering, Changzhou University, Jiangsu, 213164, China

Abstract: Fe₃O₄/NiO composite oxides have been synthesised and characterised by various analytical techniques. Fe₃O₄/NiO was used as the catalyst to activate NaHSO₃, and supplemented with visible light illumination, which formed a novel photo-assisted Fenton-like system in degradation of dye in wastewater. By changing the calcination time of the precursor, three composite oxides are obtained. In degradation of the azo dye Orange II, several experimental results show that Fe₃O₄/NiO(8h) has the best adsorption and catalytic ability, 90% of the dye can be removed within 2 h in the Fe₃O₄/NiO(8h)/NaHSO₃ system. Also the mechanism of the degradation is discussed.

Keywords: Fe-Ni composite oxide; NaHSO₃; visible light; photocatalyst; degradation.

DOI: 10.1504/IJEP.2023.135414

International Journal of Environment and Pollution, 2023 Vol.72 No.1, pp.17 - 28

Received: 15 Apr 2021
Received in revised form: 19 Aug 2022
Accepted: 25 Aug 2022
Published online: 11 Dec 2023 *