摘要
制备高效光催化剂将二氧化碳还原转化为有价值的化学品,是缓解能源危机和环境污染的有效措施.本论文通过高温焙烧法,制备了富氧空位修饰的Bi_(2)O_(2)S光催化剂,并将其用于可见光驱动的CO_(2)光还原,确定了富氧空位修饰的Bi_(2)O_(2)S光催化剂的最佳制备条件.通过一系列实验及表征,证实了BiOS-OV中丰富氧空位的存在;结合理论计算深入分析了引入的丰富氧空位对Bi_(2)O_(2)S光催化剂的内部电子结构及光化学性能等的影响.深入研究了整个体系中光催化CO_(2)还原反应的具体步骤,旨在揭示丰富氧空位的存在引起CO_(2)光还原性能提高的根本原因.
Oxygen vacancy-rich bismuth oxysulfide(Bi_(2)O_(2)S)with layered structure was prepared for efficient photocatalytic CO_(2) reduction under visible light irradiation.The existence of rich oxygen vacancies in Bi_(2)O_(2)S,which was proven by sufficient characterization,can provide abundant active sites,improve CO_(2) adsorption and activation abilities and boost the separation efficiency of photogenerated carriers,as determined by theoretical and experimental analyses.As a result,Bi_(2)O_(2)S with rich oxygen vacancies achieves excellent CO_(2) conversion with a CH4 production of 65.8μmol g^(-1) under 90 min of visible light irradiation,which was 27-fold higher than the pristine Bi_(2)O_(2)S.The mechanism of photocatalytic conversion of CO_(2) to CH4 was also determined by in situ FT-IR analyses.This study provides an in-depth understanding of the development of Bi-O-S system photocatalysts through defect engineering for photocatalytic CO_(2) reduction.
作者
姜丽莎
李源
吴晓勇
张高科
Lisha Jiang;Yuan Li;Xiaoyong Wu;Gaoke Zhang(State Key Laboratory of Silicate Materials for Architectures,Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan University of Technology,Wuhan 430070,China;Shenzhen Research Institute of Wuhan University of Technology,Shenzhen 518000,China3;Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450052,China)
基金
supported by the Science and Technology Planning Project of Shenzhen Municipality(JCYJ20200109150225155)
the Natural Science Foundation of Hubei Province (2016CFA078)
the National Natural Science Foundation of China (51472194 and 21975193)
the Fundamental Research Funds for the Central Universities (2020-YB-031)
