Key Words:Electron spin resonance spectroscopy;Architecture - Charge transfer - Complexation - Electrochemical impedance spectroscopy - Heterojunctions - Light - Magnetic moments - Photocatalytic activity - Photoluminescence - Semiconductor quantum wells - Tungsten compounds

Abstract:The novel WO<inf>3</inf>/RGO/protonated g-C<inf>3</inf>N<inf>4</inf> (PCN) composites with a 2D/2D/2D architecture were successfully prepared through a microwave-assisted hydrothermal method. The 2D/2D/2D heterojunction exhibited a short charge migration path and a wide interface contact area, which could produce a large number of intimate high-speed charge transfer channels and enhance bulk-to-surface and interfacial charge transfer abilities. The WO<inf>3</inf>/RGO/PCN composites displayed dramatically improved photodegradation performance for tetracycline hydrochloride (TC-HCL) under illuminating of visible light as compared to PCN, WO<inf>3</inf>, as well as binary RGO/PCN and WO<inf>3</inf>/PCN heterojunctions. The photocatalytic mechanism was confirmed by photoluminescence spectra (PL), photocurrent response, electron spin resonance spectra (ESR) and electrochemical impedance spectroscopy (EIS). The synergistic effect of 2D/2D/2D architecture and Z-Scheme electron migration mechanism greatly boosts the migration and separation of photoexcited charge carriers that leads to the enhanced photodegradation activity.<br/> © 2019 Elsevier B.V.

Volume:496

Issue:无

Translation or Not:no