Yang Weiping, Ren Qin, Zhong Fengyi, Wang Yanxia, Wang Jielin, Chen Ruimin, Li Jieyuan, Dong Fan
Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313000, China.
Nanoscale. 2021 Dec 16;13(48):20601-20608. doi: 10.1039/d1nr05363a.
Bismuth oxyiodide (BiOI) is a traditional layered oxide photocatalyst that performs in a wide visible-light absorption band, owing to its appropriate band structure. Nevertheless, its photocatalytic efficiency is immensely inhibited due to the serious recombination of photogenerated charge carriers. Herein, this great challenge is addressed a new strategy of intralayer modification by -OH groups in BiOI, which leads to enhancement of the reactants' activation capacity to promote photocatalytic activity and generate more active species. Furthermore, analysis a combination of experimental and theoretical methods revealed that the -OH group-functionalized samples reduce the energy barriers for conversion of the main intermediate (NO), which is easily transformed to NO, thus accelerating the oxidation of NO to the final product (NO). This study gives insight into NO oxidation, improving the photocatalytic efficiency, and mastering the photocatalysis reaction mechanism to curb air pollution.
碘氧化铋（BiOI）是一种传统的层状氧化物光催化剂，由于其合适的能带结构，在较宽的可见光吸收带内发挥作用。然而，由于光生电荷载流子的严重复合，其光催化效率受到极大抑制。在此，通过在BiOI中引入-OH基团进行层内修饰的新策略解决了这一重大挑战，这导致反应物活化能力增强，从而促进光催化活性并产生更多活性物种。此外，结合实验和理论方法的分析表明，-OH基团功能化的样品降低了主要中间体（NO）转化的能量势垒，NO易于转化为NO，从而加速了NO氧化为最终产物（NO）的过程。本研究深入了解了NO氧化过程，提高了光催化效率，并掌握了光催化反应机理以抑制空气污染。
