摘要：

采用阴极电沉积法在泡沫镍上负载Zn²⁺掺杂TiO₂,制得Zn/TiO₂/泡沫镍光催化剂,利用XRD、SEM、UV-Vis、CA对其进行了晶体结构、表观形貌、光学及光电特性的分析,并研究了可见光催化氧化As(Ⅲ)的反应性能。结果表明,掺杂Zn²⁺将TiO₂禁带宽度减少0.05 eV,使起始吸收带边红移。Zn/TiO₂/泡沫镍光电流密度为非掺杂的5倍。Zn/TiO₂/泡沫镍可见光催化氧化As(Ⅲ)的去除率为非掺杂的1.8倍,羟基自由基在光催化过程中起重要作用。光催化后溶液未检测到镍基材溶出,可应用于处理饮用水。

关键词: 阴极电沉积, 二氧化钛, 光催化, 砷, 泡沫镍

Abstract:

Zn/TiO₂/nickel foam photo-catalyst has been prepared by cathodically electrochemical deposition method on nickel foam loading Zn²⁺-doped TiO₂. Its crystal structure,superficial appearance,optical and photoelectric proper- ties have been analyzed by XRD,SEM,UV-Vis and CA. Then,the reactivity worth of visible light catalytic oxidation of As(Ⅲ) has been studied. The results show that the optical absorption edge of the Zn²⁺-doped TiO₂ appears shifted towards the longer wavelength side and the band gap decreases by 0.05 eV. In addition,light current density of Zn/TiO₂/nickel foam shows 5 times higher than that of TiO₂/nickel foam under visible light irradiation. As(Ⅲ) removing rate of Zn/TiO₂/nickel foam is 1.8 times higher than that of TiO₂/nickel foam under visible light irradiation. The hydroxyl free radicals play an important role in the photocatalytic process. Nickel substrate dissolution has not been detected in solution after photocatalysis. Therefore,Zn/TiO₂/nickel foam is quite suitable for the application to the treatment of drinking water.

Key words: cathodic electrodeposition, titanium dioxide, photocatalysis, arsenic, nickel foam

中图分类号: 

• X703.1