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

doi:10.16085/j.issn.1000-6613.2019-2079

Abstract

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

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

CLC Number:

O643.3

Peng KONG, Zhenyu GE, Jie WANG, Ruiyi WANG, Zhong LI, Zhanfeng ZHENG. Effects of carriers on the photocatalytic performance of polyaniline for the benzylamine oxidation reaction under visible-light irradiation[J]. Chemical Industry and Engineering Progress, 2020, 39(10): 4041-4050.

孔鹏, 葛振宇, 汪杰, 王瑞义, 李忠, 郑占丰. 载流子对聚苯胺可见光催化苄胺氧化性能的影响[J]. 化工进展, 2020, 39(10): 4041-4050.

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