Revealing the charge transfer mechanism in magnetically recyclable ternary g-C3N4/BiOBr/Fe3O4 nanocomposite for efficient photocatalytic degradation of tetracycline antibiotics. (September 2022)

• Record Type: Journal Article
• Authors: Preeyanghaa, Mani; Dhileepan, M.D.; Madhavan, Jagannathan; Neppolian, Bernaurdshaw
• Is Part Of: Chemosphere. Volume 303:Part 2(2022)
• Publication Date: 2022-09
• Subjects: Carbon nitride -- Bismuth oxyhalide -- Ternary magnetic photocatalyst -- Z-scheme heterojunction -- Tetracycline antibiotics; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.135070
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Pharmaceutical compounds in water bodies pose hazards to the ecosystem because of their biotoxicity potency. To eradicate such pharmaceutical compounds, a novel g-CN/BiOBr/Fe3 O4 nanocomposites was prepared using a simplistic route and appraised for photodegradation of model tetracycline antibiotics. The g-CN/BiOBr/Fe3 O4 nanocomposites exhibited complete tetracycline degradation in just 60 min exposure of simulated light irradiation, which is 6 times higher than the g-CN. Under the analogous condition, the tetracycline mineralization ability of the g-CN/BiOBr/Fe3 O4 nanocomposites was evaluated to be 78% of total organic carbon removal. The superior photocatalytic performance is ascribed to the extended visible light harvesting ability and enhanced charge carrier separation/transfer with impeded recombination rate in light of effective indirect Z-scheme heterojunction construction. Based on band-edge potential and radical trapping studies indicate that h + > O2 − > OH are the active species responsible for photodegradation. Furthermore, the ternary nanocomposites are magnetically retrievable and recyclable while retaining their stable photocatalytic performance. This work endows a new perspective on the rational design and construction of magnetically recoverable ternary nanocomposite for environmental remediation. Graphical abstract: Image 1 Highlights: Magnetically retrievable g-CN/BiOBr/Fe3 O4 nanocomposites were successfully prepared. g-CN/BiOBr/Fe3 O4 exhibited superior catalytic activity in TC degradation (ca. 96%). Z-scheme g-CN/BiOBr/Fe3 O4 facilitated the photogenerated charge separation/transfer.