化工进展 ›› 2020, Vol. 39 ›› Issue (10): 4041-4050.DOI: 10.16085/j.issn.1000-6613.2019-2079

• 工业催化 • 上一篇    下一篇

载流子对聚苯胺可见光催化苄胺氧化性能的影响

孔鹏1,2(), 葛振宇2, 汪杰2, 王瑞义2, 李忠1(), 郑占丰2()   

  1. 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
  • 出版日期:2020-10-05 发布日期:2020-10-09
  • 通讯作者: 李忠,郑占丰
  • 作者简介:孔鹏(1986—),男,博士研究生,研究方向为聚合物光催化有机合成。E-mail:kongpeng@sxicc.ac.cn
  • 基金资助:
    国家自然科学基金(21773284)

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

Peng KONG1,2(), Zhenyu GE2, Jie WANG2, Ruiyi WANG2, Zhong LI1(), Zhanfeng ZHENG2()   

  1. 1.Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    2.State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China
  • Online:2020-10-05 Published:2020-10-09
  • Contact: Zhong LI,Zhanfeng ZHENG

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。

关键词: 聚合物, 极化子, 双极化子, 催化, 活化, 苄胺氧化

Abstract:

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.

Key words: polymers, polarons, bipolarons, catalysis, activation, benzylamine oxidization

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn