多卤代污染物的光催化降解
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- 英文论文题名：Photocatalytic degradation of polyhalogenated pollutants
- 论文作者：陈春城 ; 吕艳辉 ; 藉宏伟 ; 马万红 ; 赵进才
- 英文论文作者：Chuncheng Chen ; Yanhui Lv ; Hongwei Ji ; Wanhong Ma ; Jincai Zhao ; Institute of Chemistry ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院化学研究所;
- 论文关键词：光催化 ; 卤代污染物 ; 脱卤 ; 多溴联苯醚
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：X505;O643.3
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：163k
- 原文格式：D
- 会议级别：全国
摘要
有机卤代物所造成的污染已经成为世界亟待及解决的问题之一,利用现有技术和材料很难对其处理,其中阻燃剂多溴联苯醚(PBDEs)因在全球范围的环境中被广泛检出,并且在生物体内会持续累积而备受关注,成为环境领域的研究热点。PBDEs可以在二氧化钛表面通过质子耦合电子转移过程发生快速光催化还原逐渐脱溴降解。但是随着脱溴程度的增加反应变得越来越困难,导致高毒性的中间物大量积累。但是在光催化表面负载纳米金属离子如Pd和Cu等作为助催化剂,可以极大促进光催化还原脱溴的程度和速率。进一步研究显示助催化剂可以增强极性非常弱的PBDEs在催化剂表面的吸附,并通过肖特基结捕获光生电子而使表面电子富余,从而起到电子转移桥梁的作用。更重要的是金属表面的催化作用可以加速C-Br的还原裂解,从而极大的促进光催化还原脱卤反应的效率。我们的研究表明半导体光催化为去除多卤代污染物提供了一种有效的方法。
The pollution caused by organohalogenated pollutants such as polybrominated diphenyl ethers(PBDEs) has been one of the global issues that need to be addressed urgently.We reported that the TiO_2-based photocatalysis can lead to the rapid debromination of PBDEs via a proton coupled electron transfer process.However,the debromination of the less brominated congeners became rather difficult on the bare TiO_2.When metal particles such as Pd and Cu are loaded on the surface of TiO_2 as a co-catalyst,the complete debromination can be realized because of the enhanced adsorption ability for PBDEs and the catalysis properties for C-Br bond cleavage of these metals.
The pollution caused by organohalogenated pollutants such as polybrominated diphenyl ethers(PBDEs) has been one of the global issues that need to be addressed urgently.We reported that the TiO_2-based photocatalysis can lead to the rapid debromination of PBDEs via a proton coupled electron transfer process.However,the debromination of the less brominated congeners became rather difficult on the bare TiO_2.When metal particles such as Pd and Cu are loaded on the surface of TiO_2 as a co-catalyst,the complete debromination can be realized because of the enhanced adsorption ability for PBDEs and the catalysis properties for C-Br bond cleavage of these metals.
引文
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[2]Sun,C.Y.;Chang,W.;Ma,W.H.;Chen,C.C.;Zhao,J.C.,Environ.Sci.Technol 2013,47,2370.
[3]Sun,C.Y.;Zhao,D.;Chen,C.C.;Ma,W.H.;Zhao,J.C.,Environ.Sci.Technol 2009,43,157.
[4]Sun,C.Y.;Zhao,J.C.;Ji,H.W.;Ma,W.H.;Chen,C.C.,Chemosphere 2012,89 420.