Ag-CNT/TiO_2复合电极对亚甲基蓝的光电催化降解作用(英文)

Photoelectrocatalytic properties of Ag-CNT/TiO_2 composite electrodes for methylene blue degradation

采用金属银修饰的碳纳米管制备了Ag-CNT/TiO2复合电极。利用X-射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),和能量分散性X射线分析(EDX)对所制的Ag-CNT/TiO2复合材料进行了表征。结果表明:二氧化钛颗粒和金属银颗粒在碳纳米管上均匀分布,所制电极具有较高的光电催化性能。其对亚甲基蓝的光电催化降解归因于一种协同效应,即二氧化钛的光降解、碳纳米管网络的电子辅助、金属银的增强和外加电势的作用。尤其是,经银修饰的复合电极增强了其对亚甲基蓝的光电降解,且随银含量的增加其光电催化效果增加。

Carbon nanotubes modified with silver（Ag-CNTs）were used for the fabrication of Ag-CNT/TiO2 composite electrodes.The electrodes were characterized by X-ray diffraction,transmission and scanning electron microscopy,and energy dispersive X-ray analysis.It was found that TiO2 particles were distributed uniformly in the CNT networks,and silver particles were fixed on the surface of the CNTs..The composite electrodes exhibited a high photoelectrocatalytic（PEC）activity.The PEC degradation efficiency for methylene blue（MB）was a synergistic effect of photo-degradation of TiO2,increased electrical conductivity by the CNT networks,an effect of the silver and a function of the applied potential.Especially,the composites treated with silver revealed an enhanced photo-degradation ability for MB and the PEC activity increased with increasing silver content.