纳米二氧化钛/硅藻土复合材料制备及光催化性能研究

摘要

Using purified diatomite as carrier and tetrabutyl titanate as precursor,the nano-TiO2/diatomite composite mate rial was prepared by sol-gel method.The composite material was characterized by the means of XRD,SEM,and FT-IR etc..The photocatalytic activity of the composite material was tested by Rhodamine B.The experimental results showed that the nano-TiO2 were uniformly loaded on the surface of diatomite and the crystal of TiO2 was anatase,whose grain size was 11.5 nm.When the TiO2 loading amount was 25.5％,the calcination temperature was 500 ℃,and pH=3,the degradation rate of Rhodamine B with initial concentration of 30 mg/L could reach 97.5％.%以提纯硅藻土为载体,钛酸四丁酯为前驱体,采用溶胶-凝胶法制备二氧化钛/硅藻土光催化复合材料.采用XRD、SEM、nT-IR等方法对复合材料进行分析表征,以罗丹明B为降解对象检测其光催化性能.结果表明:纳米二氧化钛均匀负载于硅藻土表面,其晶型为锐钛矿,晶粒尺寸为11.5 nm.二氧化钛负载量为25.5％、煅烧温度为500℃、pH=3时,初始质量浓度为30 mg/L的罗丹明B溶液降解率为97.5％.