Fe-C-TiO_2的制备与表征

Preparation and characterization of Fe-C-TiO_2

以金红石型TiO2(TIO-R)、葡萄糖及FeC2O4为前驱物,在氩气气氛中煅烧制备Fe-C-TiO2催化剂,以内分泌干扰物阿特拉津作模型污染物,研究Fe-C-TiO2可见光催化H2O2降解阿特拉津的光催化反应特性。结果表明,煅烧温度影响Fe-C-TiO2的组成(碳包覆量和负载Fe的存在形式)及催化活性;673 K煅烧温度下Fe-C-TiO2的碳包覆量约为2.5%,而负载Fe主要以高活性的α-Fe2O3形式存在;Fe-C-TiO2能在可见光下催化H2O2降解阿特拉津,反应45 min后,阿特拉津的降解率达99%,远高于TIO-R的催化活性,负载Fe与TIO-R之间存在明显的协同效应;反应体系的荧光光谱分析显示,阿特拉津的降解涉及较单纯羟基自由基(.OH)更为复杂的反应机理。

Abstract： Fe-C-TiO2 photocatalysts were prepared by calcination of rutile TiO2, glucose and FeC204 in argon atmosphere, and the photocatalytic properties of Fe-C-TiO2 with H2O2 photocatalysis were also studied by using atrazine as model pollutants. The results indicate that the calcination temperature has great effects on the constituent（carbon coating and existing form of Fe） and photoactivities of Fe-C-TiO2, the carbon coating of Fe-C-TiO2 calcined at 673 K is approximately 2.5%, and iron element is in the form of α-Fe2O3 which has high catalytic activity. Atrazine can be degraded with H2O2 photocatalyzed by Fe-C-TiO2 under visible irradiation, the degradation ratio reaches 99% after reaction for 45 min, and the degradation efficiency is evidently higher than that of the TIO-R. The fluorescence spectnma analysis indicates that the reaction process is not limited to the generation of hydroxyl free radical （.OH） in the system.