Efficient visible light photocatalytic NOx removal with cationic Ag clusters-grafted (BiO)2CO3 hierarchical superstructures

被引：47

作者：

Feng, Xin ^{[1
]}

Zhang, Wendong ^{[2
]}

Deng, Hua ^{[3
]}

Ni, Zilin ^{[2
]}

Dong, Fan ^{[1
]}

Zhang, Yuxin ^{[4
]}

机构：

[1] Chongqing Technol & Business Univ, Coll Environm & Resources, Chongqing Key Lab Catalysis & Funct Organ Mol,Min, Coll Environm & Resources,Engn Res Ctr Waste Oil, Chongqing 40067, Peoples R China

[2] Chongqing Normal Univ, Dept Sci Res Management, Chongqing 401331, Peoples R China

[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China

[4] Chongqing Univ, Coll Mat Sci & Engn, Natl Key Lab Fundamental Sci Micro Nanodevices &, Chongqing 400044, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2017年 / 322卷

基金：

中国国家自然科学基金;

关键词：

Hierarchical superstructure; Cluster; Interfacial charge transfer; Visible light photocatalysis; Air purification; CHARGE-TRANSFER ABSORPTION; HETEROJUNCTION PHOTOCATALYSTS; CONTROLLABLE SYNTHESIS; DOPED TIO2; BIOX X; MICROSPHERES; SURFACE; BI2O3; AIR; NANOSTRUCTURES;

D O I：

10.1016/j.jhazmat.2016.05.007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A facile method was developed to graft cationic Ag clusters on (BiO)(2)CO3 hierarchical 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. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：223 / 232

页数：10

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