凹凸棒/Bi2WO6光催化复合材料的制备及性能

Preparation and performance of attapulgite/Bi2WO6 photocatalytic composite

由于Bi2WO6半导体具有无毒、强氧化性、强可见光响应等特点,呈现出优异的光催化活性。然而,Bi2WO6具有比表面小和吸附能力差的缺点限制了其实际应用。利用凹凸棒黏土的强吸附性,通过调节水热反应温度和时间、凹凸棒黏土与Bi2WO6的质量比及前驱体溶液的pH值等条件制备凹凸棒/Bi2WO6光催化复合材料,并对其进行XRD、SEM、N2吸附-解吸和紫外-可见漫反射光谱(UV-vis DRS)等表征测试。研究表明,在180℃水热反应18h、凹凸棒黏土与Bi2WO6的质量比为6%、凹凸棒/Bi2WO6光催化复合材料前驱体溶液的初始pH=1时,凹凸棒/Bi2WO6光催化复合材料具有3D纳米球状分层结构,且在可见光下对罗丹明B具有较好的光催化性能。

The Bi2WO6semiconductor possesses excellent photocatalytic performance due to its nontoxicity,strong oxidizing power and visible-light responsiveness.However,the small specific surface area and poor adsorption capacity limit its practical applications.The taking advantage of strong adsorption abilities of attapulgite clay to prepare attapulgite/Bi2WO6photocatalytic composite by adjusting the temperature and time of hydrothermal reaction,the mass ratio,and the pH value of the precursor solution.The as-prepared photocatalyst was characterized by XRD,SEM,N2adsorption-desorption measurements and UV-visible diffused reflectance spectra(UV-vis DRS).The results show that the attapulgite/Bi2WO6 photocatalytic composite has 3Dnanospheres hierarchical structure and exhibit a better photocatalytic activity for Rhodamine B under visible light while it is prepared under hydrothermal reaction at 180℃for 18h,the mass ratio of attapulgite clay to Bi2WO6is 6%,and the initial pH=1for the precursor solution of attapulgite/Bi2WO6photocatalytic composite.