Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore.
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
J Hazard Mater. 2018 Jan 5;341:83-92. doi: 10.1016/j.jhazmat.2017.07.031. Epub 2017 Jul 16.
Forming heterojunctioned composites is an effective way to develop visible-light-driven photocatalysts. A series of BiOBr/NaBiO composites were synthesized by surface transformation of NaBiO with hydrobromic acid. Commensurate planes of BiOBr and NaBiO enabled the formation of a closely bound interface. Composites with <20wt.% BiOBr exhibited excellent photocatalytic activity towards the degradation of chlorophenols under low intensity visible light (λ>400nm). The best photocatalyst was 9% BiOBr/NaBiO with a quantum yield of 0.365. No photocorrosion was observed after three cycles. Using radical scavengers and inert atmosphere, holes, superoxide and hydroxyl radicals were found to be involved in the photoactivity of the BiOBr/NaBiO composite. Hydroxylated and open-ring diacid molecules were identified as intermediates in the mineralization of 4-chlorophenol.
形成异质结复合材料是开发可见光驱动光催化剂的有效方法。通过氢溴酸对 NaBiO 的表面转化，合成了一系列 BiOBr/NaBiO 复合材料。BiOBr 和 NaBiO 的共面结构使得紧密结合的界面得以形成。当 BiOBr 含量低于 20wt.% 时，复合材料在低强度可见光（λ>400nm）下对氯酚的降解表现出优异的光催化活性。最佳光催化剂为 9% BiOBr/NaBiO，量子产率为 0.365。经过三个循环，没有观察到光腐蚀。通过自由基清除剂和惰性气氛实验，发现空穴、超氧自由基和羟基自由基参与了 BiOBr/NaBiO 复合材料的光活性。羟基化和开环二羧酸分子被鉴定为 4-氯苯酚矿化过程中的中间产物。
