利用含铬(Ⅵ)废水制备高效铬酸银/凹凸棒石复合光催化剂  

Synthesis of Efficient Silver Chromate/Attapulgite Nanocomposite Using Wastewater Containing Chromium(Ⅵ)

作　　者：罗洁[1] 卢敏[1] 郑英丽[1] 吴峰敏[1] 卢伟伟[1] 

机构地区：[1]河南科技大学化工与制药学院,河南洛阳471023

出　　处：《硅酸盐学报》2017年第11期1692-1698,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(No.21673067)

摘　　要：利用含铬(Cr)(VI)废水,采用原位沉淀法制备高效铬酸银(Ag_2CrO_4)/凹凸棒石(ATP)复合光催化剂,通过X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱、紫外可见漫反射光谱、荧光光谱等对其结构和性能进行表征,并以罗丹明B为降解底物,考察其光催化性能。结果表明:加入的凹凸棒石有效控制了Ag_2CrO_4粒子的生长,使其粒径变小;所得复合光催化剂中Ag_2CrO_4的粒子直径约为15 nm,且沉积在凹凸棒石表面;和纯的Ag_2CrO_4相比,Ag_2CrO_4/ATP复合光催化剂的光催化性能和稳定性有较大提高,复合催化剂的光生电子–空穴对可实现高效分离和快速传输。Silver chromate （Ag2CrO4）/attapulgite （ATP） nanocomposite photocatalyst was synthesized by an in-situ precipitation method with wastewater containing Cr （Ⅵ）. The crystal structure, morphology and optical properties of the samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy, respectively. The photocatalytic activities were evaluated by degrading Rhodamine B （RhB）. The results indicate that Ag2CrO4 nanoparticles with the average diameter size of 15 nm were loaded on the surface of attapulgite. The Ag2CrOa/ATP nanocomposite exhibits an excellent visible-light photocatalytic activity for degradation of RhB. The employment of attapulgite affects the growth of Ag2CrO4 particles efficiently, favoring the efficient separation and rapid transfer of photo-generated electrons and holes.

关 键 词：原位沉淀法 铬酸银 凹凸棒石 光催化 

分 类 号：O643.36[理学—物理化学]