载流子对聚苯胺可见光催化苄胺氧化性能的影响  

Effects of carriers on the photocatalytic performance of polyaniline for the benzylamine oxidation reaction under visible-light irradiation

作　　者：孔鹏 葛振宇 汪杰 王瑞义[2] 李忠[1] 郑占丰 KONG Peng;GE Zhenyu;WANG Jie;WANG Ruiyi;LI Zhong;ZHENG Zhanfeng(Key Laboratory of Coal Science and Technology,Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,Shanxi,China)

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024 [2]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《化工进展》2020年第10期4041-4050,共10页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(21773284,21703276)。

摘　　要：使用不同浓度的盐酸对本征态聚苯胺进行再掺杂处理,制备了一系列不同载流子(极化子和双极化子)含量的聚苯胺,通过FTIR、XRD、XPS和EPR等表征分析了极化子和双极化子结构的形成及变化过程,探究了载流子含量对能带结构、苄胺吸附活化、导电性以及光生电子-空穴分离效率的影响,考察了极化子和双极化子结构对聚苯胺光催化苄胺氧化的影响。结果表明:HCl掺杂过程中会有极化子和双极化子结构的形成,极化子和双极化子均能吸附苄胺形成表面复合物,拓展了可见光的吸收范围。极化子结构介导光生电子转移过程,促进光生电子-空穴分离,进而提高光催化苄胺氧化活性,而双极化子的存在对光催化苄胺高效转化不利。Polyanilines(PANIs)with different contents of carriers(polarons and bipolarons)were prepared by doping the emeraldine base form of polyaniline with different concentrations of HCl.The formation processes of polaron and bipolaron were characterized by FTIR,XRD,XPS and EPR spectra.The influences of the carriers on the energy band structure,the adsorption and activation of benzylamine,the conductivity,and the separation efficiency of photogenerated electron-hole pairs were analyzed.In addition,the photocatalytic performance of PANIs towards the selective benzylamine oxidation reaction under visible light were investigated.The results showed that the polaron and bipolaron were formed during the doping process of PANIs and they both interacted with benzylamine to form the surface complex,which enhanced the absorption of visible light.The polaron-mediated electron transfer process was beneficial to the separation efficiency of photo-generated electron-hole pairs,and thus improved the activity of benzylamine oxidation.However,the presence of bipolaron was unfavorable for high photocatalytic activity.

关 键 词：聚合物 极化子 双极化子 催化 活化 苄胺氧化 

分 类 号：O643.3[理学—物理化学]