Photoelectrocatalytic property and reaction mechanism of plasma photocatalyst Ag@AgBr/CNT/Ni film electrode at negative bias

被引：0
|
作者：
Li A.-C. [1 ]
Lu Y.-H. [1 ]
Li Q. [1 ]
Cao R. [1 ]
Zhao D. [1 ]
机构：
[1] School of Chemistry and Material Science, Langfang Normal University, Langfang
来源：
Li, Ai-Chang (aichangli@hotmail.com) | 1600年 / Central South University of Technology卷 / 30期
基金：
中国国家自然科学基金;
关键词：
Ag@AgBr/CNT/Ni thin film; Negative bias; Photoelectrocatalysis; Reaction mechanism; Surface plasmon resonance;
D O I：
10.11817/j.ysxb.1004.0609.2020-37498
中图分类号：
学科分类号：
摘要：
In the purpose of preparing highly efficient and stable film plasma photocatalyst and exploring rule of its photocatalytic and photoelectrocatalytic degradation of organic pollutants, Ag@AgBr/CNT/Ni thin films were prepared by composite electroplating at a constant current. Its photoelectrocatalytic properties and stability were evaluated with Rhodamine B(RhB) as a model compound under the conditions of negative bias and visible light. Using electrochemical technique and adding active species trapping agents to the reaction system, the mechanism of photoeletrocatalytic degradation for the film was explored. The results show that the Ag@AgBr/CNT/Ni thin film prepared under the optimized conditions exhibits very high photoeletrocatalytic activity, remarkable Photoelectric synergistic effect and superior catalytic stability to decompose RhB. At optimum negative bias(-0.12 V ) and under visible light irradiation in 3.0 min, the photoeletrocatalytic degradation rate of the Ag@AgBr/CNT/Ni thin film (i.e. 93.8%) is 5.4 times of that of Ag@AgBr/Ni thin film, and 23.4 times of that of P25 TiO2/ITO thin film. Compared with no cathodic bias, the photoeletrocatalytic degradation rate of the Ag@AgBr/CNT/Ni thin film to RhB is increased by 9.7 times. The photoeletrocatalytic activity keeps mostly unchanged after five recycled experiments. The improvement in photoelectrocatalytic activity for Ag@AgBr/CNT/Ni thin film can be mainly attributed to the catalysis of nano-Ag particles with outstanding SPR effect and carbon nanotubes in the film for the reduction of dissolved oxygen. The hydroxyl radical, the superoxide anion radical and the dye cationic radical have a decisive role on the photoelectrocatalytic degradation of dyes at negative bias under visible light. © 2020, Science Press. All right reserved.
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页码：401 / 410
页数：9
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