负载型纳米TiO2光催化剂的制备及其光催化活性

采用悬浮聚合法制备粉煤灰-聚苯乙烯微珠载体，通过矿化接枝技术将水热法制备的纳米TiO2负载在粉煤灰-聚苯乙烯微珠载体上，制成负载型纳米TiO2光催化剂。用x射线衍射仪、扫描电子显微镜对负载型纳米TiO2光催化剂进行了表征；通过光催化降解甲醛实验评价了负载型纳米TiO2光催化剂的活性。实验结果表明，纳米TiO2在载体上分散良好，平均粒径为36．4nm；该催化剂活性较高，明显优于粉体纳米TiO2光催化剂，重复使用10次左右，该催化剂的活性无明显下降。

Preparation of Supported Nanometer-sized Titanium Dioxide Photocatalyst and Its Photocatalytic Activity

Fly ash-polystyrene microsphere carrier was prepared by suspension polymerization method. Using graft mineralization technology, nanometer-sized TiO2 prepared by hydrothermal precipitation method was loaded onto the surface of fly ash-polystyrene microsphere carrier to prepare the supported nanometer-sized TiO2 photocatalyst. The photocatalyst was characterized with XRD and SEM and its photocatalytic activity was estimated in the formaldehyde photocatalytic degradation experiment. The experimental results show that the nanometer-sized TiO2 particles are even distributed on the microsphere surface with 36.4 nm of average diameter. The photocatalytic activity of the supported nanometer-sized TiO2 photocatalyst is significantly higher than that of TiO2 powder catalyst and decreased little after used for about 10 times.