镧掺杂二氧化钛光催化性能的研究（毕业设计论文doc）.doc

镧掺杂二氧化钛光催化性能的研究
摘要
光催化技术是目前处理有机废水的有效手段。而TiO2薄膜是众多光催化材料中较为优越的一种,但因其光催化效率低而限制了它的应用。金属离子掺杂是改善TiO2薄膜光催化性能的有效途径,本实验用稀土离子La3+掺杂TiO2薄膜,并对其光催化效果进行了测定。
实验采用改进的溶胶-%%(mol分数)的La/TiO2薄膜和纯TiO2薄膜,并用所制薄膜进行光催化甲基橙溶液试验,考察了La3+掺杂对TiO2光催化性能的影响。
结果表明:各种掺杂量的膜片(包括纯膜)都有一个最佳镀膜厚度,纯膜四层膜催化效果最好,%的膜片一层膜光催化效果最好,%的膜片三层膜效果最好。在不同的掺杂浓度下,%%的膜片和纯膜,%的膜片光催化效果略逊于纯膜。说明适量的镧掺杂可以在一定程度上提高TiO2薄膜的光催化性,但掺杂量并不是越多越好。
关键词: TiO2薄膜溶胶-凝胶法光催化掺杂
Study on the Photocatalytic Activity of
TiO2 with Lanthanum Doping
Abstract
The photochemical catalysis technology is at present processes anic waste water the effective method. But the TiO2 thin film is in the multitudinous photochemical catalysis material a more superior one kind, but because its photochemical catalysis efficiency lowered has limited its application. The metallic ion doping is improves the TiO2 thin film photochemical catalysis performance the effective way, This experiment dopes the TiO2 thin film with the rare earth ion La3+, and has carried on the determination to its photochemical catalysis effect.
The experiment uses the improvement the sol - gel preparation to mix lanthanum % and mixes lanthanum % (the mol score) the La/TiO2 thin film and the pure TiO2 thin film, and used to make the thin film to carry on the photochemical catalysis methyl orange solution experiment, Inspected the La3+ doping to the TiO2 photochemical catalysis performance influence.
The result indicated: Each kind of diaphragm (including pure diaphragm) all has a best diaphragm thickness, pure diaphragm four catalyses effects best, mixes a lanthanum % diaphragm photochemical catalysis effect well, mixes the lanthanum % diaphragm three effects to be best. Under the different doping density, The catalysis effect of the lanthanum % diaphragm is better than to mix the lanthanum % diaphragm and the pure diaphragm, but mixes the lanthanum % diaphragm photochemical catalysis pared to the pure diaphragm dif