...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Enhanced Photocatalytic Removal of Sodium Pentachlorophenate with Self-Doped Bi_2WO_6 under Visible Light by Generating More Superoxide Ions
【24h】

Enhanced Photocatalytic Removal of Sodium Pentachlorophenate with Self-Doped Bi_2WO_6 under Visible Light by Generating More Superoxide Ions

机译：可见光下自掺杂的Bi_2WO_6增强光催化脱除五氯酚钠的反应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study, we demonstrate that the photo-catalytic sodium pentachlorophenate removal efficiency of Bi_2WO_6 under visible light can be greatly enhanced by bismuth self-doping through a simple soft-chemical method. Density functional theory calculations and systematical characterization results revealed that bismuth self-doping did not change the redox power of photogenerated carriers but promoted the separation and transfer of photogenerated electron-hole pairs of Bi_2WO_6 to produce more superoxide ions, which were confirmed by photocurrent generation and electron spin resonance spectra as well as superoxide ion measurement results. We employed gas chromatography-mass spectrometry and total organic carbon analysis to probe the degradation and the mineralization processes. It was found that more superoxide ions promoted the dechlorination process to favor the subsequent benzene ring cleavage and the final mineralization of sodium pentachlorophenate during bismuth self-doped Bi_2WO_6 photocatalysis by producing easily decomposable quinone intermediates. This study provides new insight into the effects of photogenerated reactive species on the degradation of sodium pentachlorophenate and also sheds light on the design of highly efficient visible-light-driven photocatalysts for chlorophenol pollutant removal.
机译：在这项研究中，我们证明了通过简单的软化学方法自掺铋可以大大提高Bi_2WO_6在可见光下的光催化五氯酚钠去除效率。密度泛函理论计算和系统表征结果表明，铋的自掺杂不会改变光生载流子的氧化还原能力，但会促进Bi_2WO_6的光生电子-空穴对的分离和转移，从而产生更多的超氧离子，这被光电流产生和电子自旋共振谱以及超氧离子测量结果。我们采用气相色谱-质谱法和总有机碳分析法来检测降解和矿化过程。研究发现，在铋自掺杂Bi_2WO_6光催化过程中，通过产生易于分解的醌中间体，更多的超氧离子促进了脱氯过程，有利于随后的苯环裂解和五氯酚钠的最终矿化。这项研究为光生反应物种对五氯酚钠降解的影响提供了新的见解，并为高效去除可见光驱动的氯酚污染物的光催化剂的设计提供了启示。

著录项

  • 来源
    《Environmental Science & Technology》 |2014年第10期|5823-5831|共9页
  • 作者

    Xing Ding; Kun Zhao; Lizhi Zhang;

  • 作者单位

    Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China;

    Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China;

    Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of 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

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号