负载型纳米TiO_2光催化剂的制备及其光催化活性

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

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。

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.