• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Zwitterionic buffer-induced visible light excitation of TiO2 for efficient pollutant photodegradation
【24h】

Zwitterionic buffer-induced visible light excitation of TiO2 for efficient pollutant photodegradation

机译：两性离子缓冲诱导的TiO2可见光激发，以有效污染物光降解

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

Excitation of TiO2 for visible light absorption by surface complexation with antenna organic molecules is an effective strategy to improve its solar utilization efficiency for photocatalytic application, but the existing antenna molecules are mostly toxic and environmentally-aggressive, severely limiting their practical application. In this study, we tested the potential of zwitterionic buffers (Good's buffers) as an environmentally-benign alternative. The addition of Good's buffers significantly enhanced methyl orange (MO) photodegradation by TiO2 under visible light, but the enhancement degree varied with the different buffer types, buffer concentration and solution pH. The presence of 4-(2-hydroxyerhyl) piperazine-1erhanesulfonic acid (HEPES) as a typical Good's buffer led to over 90% MO removal within 180 min, whereas only slight MO removal was observed in the TiO2 alone system during the same period. Such an induced visible light photocatalytic activity was attributed to a complexation between the conjugate acid structured buffer molecule and TiO2, which favors a ligand-to-metal charge transfer (LMCT). The LMCT activity was strongly dependent on the molecule structure, especially the states of hydroxyl and amino groups of Good's buffers. The pH buffering ability of the buffers also contributed to the efficient MO photodegradation. This study suggests a great potential of Good's buffers as both "green" antenna molecules and pH buffer for strengthening TiO2-based photocatalytic remediation processes.
机译：通过与天线有机分子的表面络合进行表面络合的可见光吸收的激发是一种有效的策略，可以改善光催化应用的太阳能利用效率，但现有的天线分子大多是毒性和环保的，严重限制了它们的实际应用。在这项研究中，我们测试了作为环境良性替代品的两性离子缓冲区（良好缓冲区）的潜力。在可见光下通过TiO 2添加良好的缓冲剂显着增强了甲基橙（Mo）光降解，但增强程度随不同的缓冲型，缓冲液浓度和溶液pH而变化。作为典型的良好缓冲液的4-（2-羟基苯基）哌嗪-1erhanusuon膦酸（HEPES）的存在导致在180分钟内以超过90％的Mo去除，而在同一时期在TiO 2中仅观察到略微的Mo去除。这种诱导的可见光光催化活性归因于缀​​合酸结构缓冲分子和TiO 2之间的络合，其利用配体 - 金属电荷转移（LMCT）。 LMCT活性强烈依赖于分子结构，尤其是良好缓冲液的羟基和氨基的状态。缓冲剂的pH缓冲能力也有助于高效的Mo光降解。本研究表明，良好的缓冲液的潜力很大，如“绿色”天线分子和pH缓冲液，用于加强基于TiO2的光催化修复过程。

著录项

  • 来源
    《RSC Advances》 |2016年第42期|共6页
  • 作者

    Xiao Xiang; Zhu Wen-Wen; Lei Yu-Bin; Liu Qiu-Yue; Li Qian; Li Wen-Wei;

  • 作者单位

    Jiangsu Univ Sch Environm &

    Safety Engn Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Sch Environm &

    Safety Engn Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Sch Environm &

    Safety Engn Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Sch Environm &

    Safety Engn Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Sch Environm &

    Safety Engn Zhenjiang 212013 Peoples R China;

    Univ Sci &

    Technol China Dept Chem CAS Key Lab Urban Pollutant Convers Hefei 230026 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 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