Construction of S-scheme 1D/2D rod-like g-C3N4/V2O5 heterostructure with enhanced sonophotocatalytic degradation for Tetracycline antibiotics. (January 2022)

• Record Type: Journal Article
• Authors: Preeyanghaa, Mani; Vinesh, Vasudevan; Neppolian, Bernaurdshaw
• Is Part Of: Chemosphere. Volume 287:Part 4(2022)
• Publication Date: 2022-01
• Subjects: Graphitic carbon nitride -- Vanadium pentoxide -- S-Scheme heterojunction -- Sonophotocatalytic degradation -- Tetracycline antibiotics; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.132380
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Pharmaceutically active compounds are an emerging water contaminant that resists conventional wastewater treatments. Herein, the sonophotocatalytic degradation of Tetracycline (TC) antibiotics as a model contaminant was carried out over a rod-like g-C3 N4 /V2 O5 (RCN-VO) nanocomposite. RCN-VO nanocomposite was synthesized via ultrasound-assisted thermal polycondensation method. The results showed that the RCN-VO nanocomposite could completely remove the TC in water within 60 min under simultaneous irradiation of visible light and ultrasound. Moreover, the sonophotocatalytic TC degradation (a synergy index of ∼1.5) was superior to the sum of individual sonocatalytic and photocatalytic degradation using RCN-VO nanocomposite. Besides, the enhanced sonophotocatalytic activity of RCN-VO can be attributed to the 1D/2D nanostructure and the S-scheme heterojunction formation between RCN and VO where the electrons migrated from RCN to VO across the RCN-VO interface. Under irradiation, the built-in electric field, band edge bending and Coulomb interaction can synergistically facilitate the unavailing electron-hole pair recombination. Thereby, the cumulative electron in RCN and holes in VO can actively take part in the redox reaction which generates free radicals and attack the TC molecules. This study provides insight into a novel S-Scheme heterojunction photocatalyst for the removal of various refractory contaminants via sonophotocatalytic degradation. Graphical abstract: Image 1 Highlights: The S-scheme 1D/2D rod-like g-C3 N4 /V2 O5 (RCN-VO) nanocomposites was constructed. RCN-VO could completely remove the Tetracycline by sonophotocatalysis within 60 min. The S-scheme heterojunction accelerate the photogenerated charge carrier separation.