制备条件对纳米TiO_2-石棉尾矿酸浸渣复合材料光催化性能的影响  

Effect of Preparation Condition on Photocatalytic Activity of Nano-sized TiO_2-Acid Leaching Residue of Asbestos Tailings Composites

作　　者：孙青[1] 郑黎明[1] 郑水林[1] 李慧[1] 李朝阳[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《中国粉体技术》2014年第3期56-59,共4页China Powder Science and Technology

摘　　要：为了提高纳米TiO2的稳定性,以TiCl4为前驱体,采用水解沉淀法在石棉尾矿酸浸渣表面负载纳米TiO2,制备纳米TiO2-石棉尾矿酸浸渣复合材料,并以罗丹明B为模拟降解物,研究水与酸浸渣质量比、反应液pH、反应时间等因素对复合材料光催化性能的影响,采用X射线衍射仪和扫描电子显微镜对复合材料进行表征。结果表明:在水与石棉尾矿酸浸渣的质量比为30∶1,pH为6,反应时间为1.5 h的优化条件下制备的复合材料,经800℃煅烧2 h后对罗丹明B的降解率为90.5%;复合材料呈现疏松多孔的松散形态,复合材料中纳米TiO2的平均晶粒度为20.9 nm。To improve the stability of TiO2 nano-particles, using the acid leaching residue of asbestos tailings as the cartier and TiCl4 as the precursor, the nano-sized TiO2-acid leaching residue of asbestos tailings composites were prepared by the method of hydrolysis deposition. The effects of mass ratio of water and acid leaching residue, pH value of the reaction solution and reaction time on the photocatalytic activity of the composites were investigated through the degradation of rhodamine B. The composites were characterized by means of XRD and SEM. The results indicate that the optimal conditions are obtained that the mass ratio of water and acid leaching residue is 30： i, pH is 6 and reaction time is 3 h. Under the optimal conditions, the degradation rate ofrhodamine B is 90.5% by the composites after being calcined at 800 ℃ for 2 h. The composites show loose and porous morphology and the average grain size of TiO2 nano-particles is 20.9 nm.

关 键 词：纳米TIO2 石棉尾矿 酸浸渣 光催化 

分 类 号：TB332[一般工业技术—材料科学与工程]