Enhanced photocatalytic degradation of bisphenol A by magnetically separable bismuth oxyiodide magnetite nanocomposites under solar light irradiation. (February 2022)

• Record Type: Journal Article
• Authors: Kim, Bolam; Jang, Jiseon; Lee, Dae Sung
• Is Part Of: Chemosphere. Volume 289(2022)
• Publication Date: 2022-02
• Subjects: Bismuth oxyiodide -- Photocatalysis -- Solar light -- Magnetic separation -- Reuability -- Bisphenol A; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.133040
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Bismuth oxyiodide/magnetite (BiOI/Fe3 O4 ) nanocomposites were synthesized by a hydrothermal reaction. The synthesized BiOI/Fe3 O4 was used to remove bisphenol A (BPA) from an aqueous solution under simulated solar light. The molar ratio of Bi to Fe in BiOI/Fe3 O4 significantly affected BPA degradation, with the optimal BiOI/Fe3 O4 (2:1) ratio in the composites. Optimum operating conditions such as a catalyst dosage of 1.0 g/L, an initial BPA concentration of 10 mg/L, and pH 7 gave a complete degradation of completely removed BPA within 30 min. The primary reactive oxygen species were verified as superoxide radicals and holes in oxidative species experiments. The magnetic BiOI/Fe3 O4 could be easily collected from an aqueous solution by an external magnet, and its reusability was successfully demonstrated through recycling experiments. Furthermore, the derivatives in BiOI/Fe3 O4 photocatalytic reactions were investigated, and a possible BPA degradation pathway was proposed. These results show that BiOI/Fe3 O4 nanocomposites have great potential for BPA removal from water and wastewater treatment systems. Graphical abstract: Image 1 Highlights: Magnetic BiOI/Fe3 O4 nanocomposites are successfully synthesized via a hydrothermal method. BiOI/Fe3 O4 (2:1) with a 2:1 molar ratio of Bi to Fe produces higher photocatalytic activity. Magnetic BiOI/Fe3 O4 exhibits complete BPA degradation within 30 min under simulated solar light. Superoxide radicals and photogenerated holes are the main oxidative species in BPA degradation.