Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; School of Resources and Environment, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
School of Resources and Environment, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
J Hazard Mater. 2020 Dec 5;400:123174. doi: 10.1016/j.jhazmat.2020.123174. Epub 2020 Jun 11.
Photocatalysis technology has been extensively adopted to abate typical air pollutants. Nevertheless, it is a challenge to develop photocatalysts aiming to simultaneously improve photocatalytic selectivity and efficiency. In this study, to improve the photocatalytic selectivity and the performance of (BiO)CO in the oxidation of NO to target products (NO /NO), we developed a novel method to construct La-doped (BiO)CO (La-BOC) for forming localized excess electrons (Ex) on (BiO)CO surface. The results indicate that the Ex could effectively accelerate the activation of reactants and promote charge separation and transfer. Under visible light, the gas molecules could capture the Ex and get activated to produce reactive oxygen species (ROS) with high oxidation ability, which enables complete oxidation of NO to target products instead of producing other toxic by-products. Due to the functionality of the Ex, the photocatalytic selectivity and efficiency of La-BOC have been synchronously improved. Combining experimental and theoretical methods, this work unravels the pathway of charge carriers transportation/transformation and elucidates the photocatalytic NO oxidation mechanism. The present work could provide a novel method to improve photocatalytic selectivity and activity for safe air pollutant abatement.
光催化技术已广泛应用于消除典型的空气污染物。然而，开发旨在同时提高光催化选择性和效率的光催化剂仍然是一个挑战。在这项研究中，为了提高（BiO）CO 在氧化 NO 为目标产物（NO/NO）中的光催化选择性和性能，我们开发了一种新的方法来构建 La 掺杂的（BiO）CO（La-BOC），在（BiO）CO 表面形成局部过剩电子（Ex）。结果表明，Ex 可以有效地加速反应物的活化，并促进电荷分离和转移。在可见光下，气体分子可以捕获 Ex 并被激活，产生具有高氧化能力的活性氧物种（ROS），从而使 NO 完全氧化为目标产物，而不是产生其他有毒副产物。由于 Ex 的功能，La-BOC 的光催化选择性和效率得到了同步提高。通过实验和理论相结合的方法，本工作揭示了载流子输运/转化的途径，并阐明了光催化 NO 氧化的机制。本工作为提高光催化选择性和活性以安全去除空气污染物提供了一种新方法。
