摘要
采用溶胶-凝胶法在玻璃基片上制备掺杂钼酸根离子(MoO42-)、高锰酸根离子(MnO42-)、钨酸根离子(WO42-)和锡酸根离子(SnO32-)等复杂无机阴离子的二氧化钛光催化薄膜。光催化实验表明钼酸根离子、高锰酸根离子和钨酸根离子的掺杂都在不同程度上降低了薄膜的光催化性能,掺杂浓度不同对薄膜光催化性能的影响略有不同,而掺杂浓度为0.006mol·L-1的锡酸根离子可以提高薄膜的光催化活性。利用傅立叶红外光谱研究了掺杂复杂无机阴离子对纳米二氧化钛表面结构的影响,结果表明SnO32-掺杂后TiO2的晶格振动峰出现明显的宽化,分析认为SnO32-通过热分解产生SnO2,抑制TiO2粒子在热处理过程中生长,有利于形成更细小的晶体,从而提高其光催化活性。
TiO2 photocatalytic film was prepared by sol-gel method doped with inorganic anions such as MoO4^2-, MnO4^2-, WO4^2- and SnO3^2- respectively on the glass substrate surface. Photocatalytic tests show that MoO4^2-, MnO4^2-, WO4^2- doping decrease the activity of TiO2 more or less, the effects of whose concentrations differ a litter. However, SnO3^2- doping with 0.006 mol.L^-1 increases the photocatalytic activity of TiO2 film. The effect of inorganic anion doping on the surface structure of nano-TiO2 was investigated by FT-IR. The results show that the optimized concentration is 0.006 mol.L^-1. FT-IR spectra of the TiO2 films doped with different anions show a broadened TiO2 characterized peak exists on TiO2 film doped with SnO3^2-. The possible reason is that SnO3^2- may produce SnO2 during the heating decomposition process due to its thermal instability, which will inhibit the growth of TiO2 grain to form finer crystal and improve the photocatalytic activity.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期873-875,共3页
Rare Metal Materials and Engineering
基金
军械工程学院院基金资助(YJJXM0613)
关键词
二氧化钛薄膜
光催化
无机阴离子
掺杂
TiO2 film
photocatalytic activity
inorganic anion
doping
