期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 303, 期 -, 页码 1-9出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.10.029
关键词
Plasmonic photocatalyst; Heterojunction; Mesoporous silica; Gold nanoparticles; BiOCl
资金
- National Science Foundation of China [51133006, 21403197, 21503189]
- Zhejiang Provincial Natural Science Foundation of China [LY15B030009]
- China Postdoctoral Science Foundation [2014M550333, 2015T80636]
- Young Researchers Foundation of Key Lab of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University [2013QN04, 2014QN01]
- Scientific Research Foundation for Zhejiang Sci-Tech University [13012142-Y, 14012080-Y]
- Special Foundation for the Excellent Doctors of Zhejiang Sci-Tech University [2013YBZX04]
A new mesoporous silica protected plasmonic photocatalyst, Au/BiOCl@mSiO(2), was prepared by a modified ACHE method and a subsequent UV light induced photodeposition process. The surfactant-free heterojunction allows the electrons spontaneously flow from Au to nearby BiOCl surface, leading to the accumulation of positive charges on Au surface, and negative charges on Bi species under visible light. Au/BiOCl@mSiO(2) exhibits high visible light photocatalytic efficiency in complete oxidation of aqueous formaldehyde and Rhodamin B. We showed that a positive relationship exists between the LSPR effect and rate enhancements, and leads to a hypothesis that the metallic Au LSPR enhances the photocatalytic rates on nearby semiconductors by transferring energetic electrons to BiOCl and increasing the steady-state concentration of active (OH)-O-center dot species by a multi-electron reduction of molecular oxygen. The (OH)-O-center dot species is the main oxidant in photocatalytic transformations, whose intensity is greatly enhanced in the dye-involving systems due to the synergetic effect between LSPR and dye sensitization processes. In addition, the mesoporous SiO2 shell not only inhibits the over growth of BiOCl nanocrystals within the silica frameworks, but also protects the dissolution of chloride or Au species into aqueous solution, which ultimately makes the Au/BiOCl@mSiO(2) catalysts rather stable during photocatalysis. (C) 2015 Elsevier B.V. All rights reserved.
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