纳米TiO_2的制备及其光催化活性  

Preparation and photocatalytic characteristics of nanometer-sized TiO_2 by the polyacrylamide gel method

作　　者：邵忠宝[1] 陈艳芳[1] 栾万强 陈雪冰[1] 

机构地区：[1]东北大学 [2]韩国明知大学

出　　处：《材料研究学报》2005年第2期213-217,共5页Chinese Journal of Materials Research

摘　　要：用高分子凝胶法制备纳米TiO2,研究了烧结温度对晶粒大小的影响以及粉体的平均粒径和光催化活性的关系.结果表明:高分子凝胶形成的小且均匀的网格限制了TiO2晶粒之间的接触和团聚,因此在较低温度下即可合成分散性好、平均粒径细小、粒径均匀且无团聚具有锐钛矿结构的纳米TiO2.随着煅烧温度的升高,纳米TiO2的平均粒径逐渐增大.纳米TiO2平均粒径的减小可提高其光催化活性以及对次甲基蓝的降解速率.适量的TiO2可以使次甲基蓝的降解率达到70%.Nanometer-sized TiO2 was synthesized by polyacrylamide-gel method. Acrylamide and N,N-methyenbisacrylamide were used to make polyacrylamide-gel from an aqueous solution of titanium (III) chloride. The effect of sintering temperature on mean particle size of and the photocatalytic activity of nanometer-sized crystalline TiO2 were studied by FTIR, XRD and TEM. The results showed that unaggolmeration can be obtained by sintering at lower temperature as a result of polyacrylamide network with fine and even the nanometer-sized crystalline TiO2 with high activity. The mean particle size of nanometer-sized crystalline TiO2 increased with the increasing of firing temperature. The photocatalytic activities increased with the decreasing of the average particle size of nanometer-sized crystalline TiO2 when the concentration of methylene blue was 10 mg/L and the concentration of TiO2 was 3 g/L.

关 键 词：无机非金属材料 高分子凝胶 纳米粉体 光催化活性 TIO2 

分 类 号：TB383[一般工业技术—材料科学与工程] TB321