文献类型：期刊文献

英文题名：Improved photocatalytic Bi2WO6/BiOCl heterojunctions: One-step synthesis via an ionic-liquid assisted ultrasonic method and first-principles calculations

作者：Zhu, Shiwen[1];Yang, Chengyu[1];Li, Feng[1];Li, Taohai[1];Zhang, Meng[2];Cao, Wei[3]

机构：[1]Xiangtan Univ, Coll Chem, Key Lab Environm Friendly Chem & Applicat, Minist Educ, Xiangtan 411105, Peoples R China;[2]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[3]Univ Oulu, Nano & Mol Mat Res Unit, Fac Sci, POB 3000, FIN-90014 Oulu, Finland

年份：2017

卷号：435

起止页码：33

外文期刊名：MOLECULAR CATALYSIS

收录：;EI(收录号：20173904199094);WOS:【SCI-EXPANDED(收录号:WOS:000403528300004)】；

基金：The authors acknowledge with thanks the financial support of the National Natural Science Foundation of China (21343008; 21601149) and Scientific Research Fund of Hunan Provincial Education Department, China (16B253), the Open Project Program of State Key Laboratory of Structural Chemistry, China (No. 20150018) and Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilization and the Oulu University Strategic Grant. T. Li acknowledges Oulu University Short-term International Research Visit grant during his stay in Finland. Author Meng Zhang thanks Dr. Wenjuan Yang at Huazhong University of Science and Technology for her useful discussion. Dr. Jinhong Bi from Fuzhou University is acknowledged for the photocurrent measurements.

语种：英文

外文关键词：Bi2WO6/BiOCl; Heterojunctions; Ionic-liquid; Ultrasonic; Photocatalytic

摘要：Bi2WO6/BiOCl heterojunctions with high photocatalytic activity and photocurrent property were synthesized via an ionic-liquid assisted ultrasonic irradiation at room temperature. The ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was used as the Cl source. Modifications of heterojunction structures and properties were realized just by changing the amount of [BMIM]Cl. Photocatalytic activities of Bi2WO6/BiOCl heterojunctions enable fast degradations of 2,4-dinitrophenol solution (DNP), rhodamine B (RhB) and quinoline blue (QB) under visible light and sunlight irradiation. Through first principles calculations, the Bi-O bonding was found as junction structures at the interface, leading to band intercalations between the two parts besides the interface. Efficient charge (hole) transfers to two sides of the tungstate and chloride were enabled through interface during photocatalytic processes, resulting in longer electron-hole separations, and enhanced catalytic activities under sunlight radiation. The mechanism is crosschecked with transient photocurrent results where the BiOCl-Bi2WO6 heterojunction possess higher photocurrent than pure Bi2WO6 or BiOCl, ascribed to inhibition of electron-hole recombination in the photo processes. (C) 2017 Elsevier B.V. All rights reserved.