煅烧对纳米TiO_2/石棉尾矿脱镁硅渣复合材料性能的影响  

The Effect of Calcination on the Properties of Nano-TiO_2/Silica Residue of Demagging Asbestos Tailings Composite

作　　者：孙青[1] 郑黎明[1] 郑水林[1] 李慧[1] 戴瑞[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：《非金属矿》2014年第2期30-32,共3页Non-Metallic Mines

摘　　要：以石棉尾矿脱镁硅渣为载体,采用TiCl4水解法制备了纳米TiO2/石棉尾矿脱镁硅渣复合粉体,通过煅烧使载体表面负载的纳米TiO2晶态化;研究了煅烧温度、煅烧时间对复合材料光催化性能的影响,并用XRD分析技术对复合材料进行了表征。结果表明,复合材料光催化活性最优的煅烧温度、煅烧时间分别为800℃、2 h,此条件下复合材料对罗丹明B光催化降解率为90.5%;纳米TiO2以锐钛矿晶型负载于石棉尾矿脱镁硅渣上,平均晶粒尺寸为20.9 nm。Using the silica residue of demagging asbestos tailings as the carrier, the nano-TiOjsilica residue of demagging asbestos tailings composite power was prepared by the hydrolysis of TiCI4. Then the nano-TiO2 loaded on the surface of carrier was crystallized through calcination. The effects of calcination temperature, calcination time on the photocatalytic activity of the composite were investigated. And the structure of the composite was characterized by XRD. The results indicate that the calcination temperature and calcination time for a optimal photocatalytic activity of the composite is 800 ~C and 2 h, respectively. Under this condition, the degradation rate of Rhodamine B is 90.5% on the composite. The nano-TiO2 is immobilized on the silica residue of demagging asbestos tailings in the crystal of anatase. And the average grain size of nano-TiO2 is 20.9 nm.

关 键 词：煅烧 纳米TIO2 石棉尾矿硅渣 

分 类 号：TB332[一般工业技术—材料科学与工程]