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.
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