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首页> 外文期刊>Journal of Hazardous Materials >Au/BiOCl heterojunction within mesoporous silica shell as stable plasmonic photocatalyst for efficient organic pollutants decomposition under visible light
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Au/BiOCl heterojunction within mesoporous silica shell as stable plasmonic photocatalyst for efficient organic pollutants decomposition under visible light

机译：介孔二氧化硅壳中的Au / BiOCl异质结作为稳定的等离激元光催化剂，可在可见光下有效分解有机污染物

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摘要

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.
机译：一种新的介孔二氧化硅保护的等离激元光催化剂，Au / BiOCl @ mSiO（2），通过改进的ACHE方法和随后的紫外线诱导的光沉积过程制备。不含表面活性剂的异质结使电子自发地从Au流动到附近的BiOCl表面，导致可见光下在Au表面积聚正电荷，在Bi物种上积聚负电荷。 Au / BiOCl @ mSiO（2）在甲醛水溶液和若丹明B的完全氧化中表现出较高的可见光光催化效率。我们表明LSPR效应与速率增强之间存在正相关关系，并导致了金属Au LSPR增强的假设通过将高能电子转移到BiOCl并通过分子氧的多电子还原来增加活性（OH）-O-中心点物种的稳态浓度，从而提高附近半导体上的光催化速率。 （OH）-O-中心点物质是光催化转化中的主要氧化剂，由于LSPR和染料敏化过程之间的协同作用，在涉及染料的系统中其强度大大提高。此外，介孔SiO2壳不仅抑制了BiOCl纳米晶体在二氧化硅框架内的过度生长，而且还保护了氯化物或Au物质在水溶液中的溶解，最终使Au / BiOCl @ mSiO（2）催化剂相当稳定在光催化过程中。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2016年第13期|1-9|共9页
  • 作者

    Yan Xiaoqing; Zhu Xiaohui; Li Renhong; Chen Wenxing;

  • 作者单位

    Zhejiang Sci Tech Univ, Key Lab Adv Text Mat & Mfg Technol, Minist Educ PR China, Hangzhou 310018, Zhejiang, Peoples R China;

    Zhejiang Sci Tech Univ, Key Lab Adv Text Mat & Mfg Technol, Minist Educ PR China, Hangzhou 310018, Zhejiang, Peoples R China;

    Zhejiang Sci Tech Univ, Key Lab Adv Text Mat & Mfg Technol, Minist Educ PR China, Hangzhou 310018, Zhejiang, Peoples R China|Zhejiang Univ, Dept Chem, Key Lab Appl Chem Zhejiang Prov, Hangzhou 310003, Zhejiang, Peoples R China;

    Zhejiang Sci Tech Univ, Key Lab Adv Text Mat & Mfg Technol, Minist Educ PR China, Hangzhou 310018, Zhejiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Plasmonic photocatalyst; Heterojunction; Mesoporous silica; Gold nanoparticles; BiOCl;

    机译：等离子体光催化剂;异质结;介孔二氧化硅;金纳米颗粒;BiOCl;

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