摘要
制备出H3PW12O40/La-N-TiO2催化剂并采用红外光谱,N2吸附-脱附分析,透射电镜和紫外漫反射进行结构表征。红外光谱检测表明,复合催化剂中H3PW12O40保留了Keggin结构;掺杂La-N之后,复合催化剂的BET比表面积是母体TiO2的两倍;透射电镜检测表明,催化剂由相对均匀的球形颗粒组成,分散性良好;紫外漫反射检测表明,掺杂La和N元素后所制备的复合催化剂对可将光的光响应性能明显提高。对吡虫啉的光催化实验表明,所制备的不同负载量催化剂中30%H3PW12O40/0.3%La-1.0%N-TiO2具有最好的光催化活性(≥400nm),光照3h后吡虫啉降解率为91.57%,光照6h后吡虫啉降解率达98.89%,基本上完全降解。
Catalysts H3 PW12 O40/La-N-TiO2 were prepared and characterized by FT-IR ,N2 adsorption-desorp-tion analysis ,SEM and UV-Vis diffuse reflection spectrum （DRS） .It was demonstrated that Keggin structure of H3 PW12 O40 retained in composite materials by the FT-IR test ;After doping La-N ,the BET surface area of them is nearly 2 times as that of pure TiO2 ;the SEM images of the catalysts revealed that they were consist of relatively uniform spherical grains with good dispersion ;UV-Vis DRS showed the photoresponse performance of the prepared composites for the visible light area were improved after doping La and N .The prepared com-posites were used as photocatalysts in degradation of pesticide imidacloprid .Results revealed that 30% H3 PW12 O40/0.3% La-1.0% N-TiO2 possessed the best photocatalytic activity under visible light above 400 nm .Thus , imidacloprid were degraded 91.57% after 3 h irradiation .When 30% H3 PW12 O40/0.3% La-1.0% N-TiO2 was used as catalysts ,degradation ration could even reach 98.89% after 6 h .
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2014年第2期460-464,共5页
Spectroscopy and Spectral Analysis
基金
Institution of Chemical Materials,China Academy of Engineering Physics
