Fe-Ni/TiO2纳米管阵列电极的制备、表征及光电催化还原五氯酚活性

采用阳极氧化法和浸渍电沉积联用法制备了不同负载量的Fe-Ni/TiO2纳米管阵列电极. 通过扫描电子显微镜(SEM)、 X射线光电子能谱(XPS)和电化学测量等手段对样品的微观形貌、 晶体结构和光电响应等特性进行分析. 考察了在0.6 V偏压下, 所制备的电极对五氯酚的光电催化还原性能. 结果表明, 适量的Fe和Ni纳米颗粒的负载, 降低了TiO2纳米管阵列光生电子-空穴对的复合几率; 浸渍电沉积5次的Fe-Ni/TiO2纳米管阵列电极光电催化还原降解五氯酚的效率为91.35%, 明显高于TiO2纳米管阵列电极.

Preparation and Characterization of Fe-Ni/TiO2 Nanotube Array Electrodes and Their Photoeletrocatalytic Activity for Dechlorination of Pentachlorophenol

The Fe-Ni/TiO2 nanotube array electrodes with different metal loadings were fabricated by the anodic oxidation method, followed by a dipping and electro-deposition technique. Scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS) and electrochemical measurements were employed to characterize the catalysts. The photoelectrocatalytic(PEC) reductive degradation of pentachloroph-enol(PCP) by the catalysts was investigated at 0.6 V bias potential in 2-propanol solution. The results indicate that the proper Fe and Ni nanoparticles depositing on the TiO2 nanotube array electrodes could reduce the recombination probability of photoinduced electron and hole. The PEC reductive degradation efficiency of PCP over Fe-Ni/TiO2 nanotube array electrodes with dipping and electro-deposition for 5 cycles could be above 91.35%, much faster than TiO2 nanotube electrodes.