title: Efficient visible light photocatalytic NOx removal with cationic Ag clusters-grafted (BiO)2CO3hierarchical superstructures.
abstract: A facile method was developed to graft cationic Ag clusters on (BiO)2CO3hierarchical superstructures (BHS) surface to improve their visible light activity. Significantly, the resultant Ag clusters-grafted BHS displayed a highly enhanced visible light photocatalytic performance for NOx removal due to the direct interfacial charge transfer (IFCT) from BHS to Ag clusters. The chemical and coordination state of the cationic Ag clusters was determined with the extended X-ray absorption fine structure (EXAFS) and a theoretical structure model was proposed for this unique Ag clusters. The charge transfer process and the dominant reactive species (OH) were revealed on the basis of electron spin resonance (ESR) trapping. A new photocatalysis mechanism of Ag clusters-grafted BHS under visible light involving IFCT process was uncovered. In addition, the cationic Ag clusters-grafted BHS also demonstrated high photochemical and structural stability under repeated photocatalysis runs. The perspective of enhancing photocatalysis through combination of microstructural optimization and IFCT could provide a new avenue for the developing efficient visible light photocatalysts.
authors.affiliation: Chongqing Key Laboratory of Catalysis and Functional Organic Molecules, College of Environment and Resources, Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 40067, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Feng
authors.affiliation: Department of Scientific Research Management, Chongqing Normal University, Chongqing 401331, China.
authors.forename: Wendong
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Deng
authors.affiliation: Department of Scientific Research Management, Chongqing Normal University, Chongqing 401331, China.
authors.forename: Zilin
authors.initials: Z
authors.lastname: Ni
authors.affiliation: Chongqing Key Laboratory of Catalysis and Functional Organic Molecules, College of Environment and Resources, Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 40067, China. Electronic address: dfctbu@126.com.
authors.forename: Fan
authors.initials: F
authors.lastname: Dong
authors.affiliation: College of Materials Science and Engineering, National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, China. Electronic address: zhangyuxin@cqu.edu.cn.
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Zhang
keywords: Air purification; Cluster; Hierarchical superstructure; Interfacial charge transfer; Visible light photocatalysis