Heterostructured α-Bi(2)O(3)/BiOCl Nanosheet for Photocatalytic Applications

Photocatalytic degradation of organic pollutants in wastewater is recognized as a promising technology. However, photocatalyst Bi(2)O(3) responds to visible light and suffers from low quantum yield. In this study, the α-Bi(2)O(3) was synthetized and used for removing Cl(−) in acidic solutions to transform BiOCl. A heterostructured α-Bi(2)O(3)/BiOCl nanosheet can be fabricated by coupling Bi(2)O(3) (narrow band gap) with layered BiOCl (rapid photoelectron transmission). During the degradation of Rhodamine B (RhB), the Bi(2)O(3)/BiOCl composite material presented excellent photocatalytic activity. Under visible light irradiation for 60 min, the Bi(2)O(3)/BiOCl photocatalyst delivered a superior removal rate of 99.9%, which was much higher than pristine Bi(2)O(3) (36.0%) and BiOCl (74.4%). Radical quenching experiments and electron spin resonance spectra further confirmed the dominant effect of electron holes h(+) and superoxide radical anions ·O(2)(−) for the photodegradation process. This work develops a green strategy to synthesize a high-performance photocatalyst for organic dye degradation.