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原位电化学-光还原法制备Pd/BiF3薄膜及其光催化性能

In-Situ Electrochemical-Photoreduction Synthesis and Photocatalytic Performance of Pd/BiF3 Thin Films

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摘要

通过电化学-光还原法基于Bi板合成了Pd/BiF3薄膜,探究了不同质量分数的Pd 对BiF3薄膜光催化性能的影响。利用X射线衍射仪、扫描电子显微镜、X射线光电子能谱、紫外-可见漫反射光谱对Pd/BiF3薄膜进行了表征分析。以模型污染物即罗丹明B(RhB)为光催化降解对象,考察了Pd/BiF3薄膜的光催化性能。表征结果显示,贵金属Pd均匀分布于BiF3薄膜表面上,当Pd的质量分数为2.0%时,Pd/BiF3薄膜表现出最佳的光催化降解RhB的性能,且光吸收带边发生明显的红移,带隙值由3.70 eV减小为3.03 eV。活性物种捕获实验表明,当Pd的质量分数为2.0%时,在Pd/BiF3薄膜光催化降解RhB的过程中,活性物种发挥的作用由大到小的顺序为羟基自由基(·OH)、超氧自由基(· O2-)、空穴(h +),并提出了Pd/BiF3薄膜光催化性能的增强机制。

Abstract

In this study, the Pd/BiF3 thin films are successfully prepared by the facile in-situ electrochemical-photoreduction method from the Bi plates, and the photocatalytic performances of the BiF3 thin films with different mass fractions of Pd are investigated for comparison. The Pd/BiF3 thin films are characterized by the XRD, SEM, XPS and UV-Vis DRS methods. The photocatalytic performance of Pd/BiF3 thin films is investigated with rhodamine B (RhB) as the photocatalytic degradation object. Our characterization results indicate that when the noble metal Pd is loaded uniformly on the surface of BiF3 thin films and the mass fraction of Pd is 2.0%, the Pd/BiF3 thin films exhibit the optimal photocatalytic activity and stability for the degradation of RhB. In addition, there exist an obvious redshift of optical absorption bands and a decrease of bandgap from 3.70 eV to 3.03 eV. The capture experiment of active species confirms that when the mass fraction of Pd is 2.0%, the roles of the ·OH, · O2- and h + are from large to small during the photocatalytic degradation of RhB by Pd/BiF3 films. Finally, an enhancement mechanism of photocatalytic performance of Pd/BiF3 thin films is proposed.

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中图分类号:O472

DOI:10.3788/AOS202040.1831001

所属栏目:薄膜

基金项目:国家自然科学基金、山西省优秀青年自然科学基金;

收稿日期:2020-03-25

修改稿日期:2020-06-03

网络出版日期:2020-09-01

作者单位    点击查看

郝瑞刚:太原工业学院环境与安全工程系, 山西 太原 030008
孔祥鹏:太原工业学院化学与化工系, 山西 太原 030008
赵祖:太原理工大学化学与化工学院, 山西 太原 030024
张小超:太原理工大学化学与化工学院, 山西 太原 030024

联系人作者:郝瑞刚(tyhaorg@163.com); 张小超(zhangxiaochao@tyut.edu.cn);

备注:国家自然科学基金、山西省优秀青年自然科学基金;

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引用该论文

Hao Ruigang,Kong Xiangpeng,Zhao Zu,Zhang Xiaochao. In-Situ Electrochemical-Photoreduction Synthesis and Photocatalytic Performance of Pd/BiF3 Thin Films[J]. Acta Optica Sinica, 2020, 40(18): 1831001

郝瑞刚,孔祥鹏,赵祖,张小超. 原位电化学-光还原法制备Pd/BiF3薄膜及其光催化性能[J]. 光学学报, 2020, 40(18): 1831001

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