摘要
采用化学沉淀法通过自掺杂制备了纳米TiO_(2-x)N_x粉体,并采用无机粘结剂法将其负载在基片上,再通过滴涂法对其进行贵金属修饰,从而得到修饰型光催化剂M/TiO_(2-x)N_x。采用XRD,XPS,UV-Vis等测试对其进行表征,并以甲基橙溶液为光催化降解对象,研究了M/TiO_(2-x)N_x的可见光活性。研究发现在负载TiO_(2-x)N_x表面沉积Ag,Pt,Pd和Rh均可提高其光催化活性。在最佳掺杂量时,M/TiO_(2-x)N_x的可见光活性的顺序为Pd/TiO_(2-x)N_x>Pt/TiO_(2-x)N_x>Rh/TiO_(2-x)N_x>Ag/TiO_(2-x)N_x>TiO_(2-x)N_x。光催化机理分析表明M/TiO_(2-x)N_x光催化剂的活性取决于光生电子的激发方式及其转移途径。
Nano TiO2-xNx powders were prepared by self-doping chemical precipitation process. The powders were loaded onto a substrate fixed by an inorganic adhesion. The noble metal modified M/TiO2-xNx was prepared by drop coating, which was characterized by XRD, XPS and UV-visible absorption spectrometry. The visible-light photocatalytic activities of M/TiO2-xNx were investigated by photocatalytic degradation of methyl orange solution. Deposition of Ag, Pt, Pd and Rh enhanced the photocatalytic activity of TiO2-xNx. The ability to dsgrade the methyl orange solution was in the order of Pd/TiO2-xNx〉Pt/TiO2-xNx〉Rh/TiO2-xNx〉Ag/TiO2-xNx〉 TiO2-xNx. The photocatalytic activity depended on the generation and transfer pathway of photogenerated electrons in the M/TiO2-xNx photocatalyst.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期138-141,共4页
Rare Metal Materials and Engineering
基金
天津市"高等学校科技发展基金计划项目"资助(20060910)
关键词
化学沉淀法
TiO2-xNx
光催化剂
可见光活性
贵金属修饰
光催化机理
chemical precipitation process
TiO2-xNx photocatalyst
visible-light activity
noble metal modified
photocatalytic mechanism
