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利用硅藻土结构特性和纳米二氧化钛(TiO_2)优越光催化活性,以提纯硅藻土为载体,钛酸四丁酯为前驱体,采用溶胶-凝胶法制得纳米TiO_2/硅藻土光催化复合材料。通过XRD、EDS、SEM、FT-IR对复合材料进行晶型结构和形貌表征分析,考察煅烧条件对复合材料光催化性能影响。实验结果表明:TiO_2/硅藻土复合材料最佳煅烧温度为650℃、煅烧时间3h,此时TiO_2晶型以混晶形式存在,晶粒尺寸为39.9nm;在300W高压汞灯光照3h对罗丹明B溶液降解率达到100%,经过5次重复利用后对罗丹明B降解率仍达到70.53%以上。
Based on the structural characteristics of diatomite and the excellent photocatalytic activity of TiO 2, the diatomite as carrier and tetrabutyl titanate as precursors were prepared by sol-gel method. The photocatalytic activity of nano TiO 2 / diatomite material. XRD, EDS, SEM and FT-IR were used to characterize the crystal structure and morphology of the composites. The effects of calcination conditions on the photocatalytic properties of the composites were investigated. The experimental results show that the optimum calcination temperature of TiO 2 / diatomite composite is 650 ℃ and the calcination time is 3h. At this time, the TiO 2 crystal forms as a mixed crystal with the grain size of 39.9 nm. When the 300W high- The degradation rate of Ming B solution reached 100%, and the degradation rate of Rhodamine B was still over 70.53% after five times of repeated use.