光学学报, 2020, 40 (18): 1831001, 网络出版: 2020-08-28
原位电化学-光还原法制备Pd/BiF3薄膜及其光催化性能 下载: 971次
In-Situ Electrochemical-Photoreduction Synthesis and Photocatalytic Performance of Pd/BiF3 Thin Films
薄膜 原位电化学-光还原法 Pd/BiF3薄膜 光催化性能 罗丹明B 增强机制 thin films in-situ electrochemical-photoreduction Pd/BiF3 thin film photocatalytic performance rhodamine B enhancement mechanism
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, · 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.
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. Ruigang Hao, Xiangpeng Kong, Zu Zhao, Xiaochao Zhang. In-Situ Electrochemical-Photoreduction Synthesis and Photocatalytic Performance of Pd/BiF3 Thin Films[J]. Acta Optica Sinica, 2020, 40(18): 1831001.