KBiO₃ as an Effective Visible-Light-Driven Photocatalyst: Stability Improvement by In Situ Constructing KBiO₃/BiOX (X = Cl, Br, I) Heterostructure

Abstract

Petal bismuth salt semiconductors are promising as visible-light-driven photocatalysts, but their short service times due to strong oxidation limit their application. In this research, the in situ construction of a p−n heterojunction, by growing BiOX on a KBiO 3 surface, is used as a strategy to improve the performance and stability. Evaluation of the photocatalytic degradation of crystal violet and phenol shows that the KBiO 3 /BiOX (X = Cl, Br, I) heterostructures exhibit significant improvement in photocatalytic performance and stability compared to KBiO 3 . The best one, KBiO 3 /(5.85%) BiOI, shows 98% degradation of crystal violet within 20 min, and of phenol within 1.5 h. No significant performance decay can be detected after repeated use. The development of KBiO 3 /BiOX heterostructure improves the applicability of KBiO 3 as an efficient visible-lightdriven photocatalyst.

An overview of prominent factors influencing the photocatalytic degradation of cationic crystal violet dye employing diverse nanostructured materials

“…According to Zhang et al . 's 111 investigations, when the number of runs increases, the photocatalytic performance of bare KBiO 3 in decolorizing CV steadily decreases (Fig. 23(a)).…”

CdS Microparticles Decorated with Bi0/BiOI Nanosheets for Visible Light Photocatalytic Hydrogen Evolution

“…Electronic transport performance and light absorption ability are the key factors affecting the photocatalytic activity. Through research, we found that BiOI may be useful because of its small band gap and stable chemical properties. − The simulated molecular orbital bond diagram of BiOI is shown in Scheme S1.…”

Novel recyclable BiOBr/Fe3O4/RGO composites with remarkable visible-light photocatalytic activity

“…Bismuth oxyhalides (BiOX, X ¼ I, Br, Cl) 2 as promising ternary photocatalysts with special electronic structure and excellent photocatalytic performance have been widely used in several elds. 3 Among them, BiOBr has a quite suitable band gap with a little visible-light absorption. The hybridization between O 2p and Bi 6s states induces the separation of photoexcited e À -h + pairs.…”