【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。更多还原

【Abstract】 Catalysts H3PW12O40/La-N-TiO2were prepared and characterized by FT-IR,N2adsorption-desorption analysis,SEM and UV-Vis diffuse reflection spectrum(DRS).It was demonstrated that Keggin structure of H3PW12O40retained in composite materials by the FT-IR test;After doping La-N,the BET surface area of them is nearly 2times 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 composites were used as photocatalysts in degradation of pesticide imidacloprid.Results revealed that 30%H3PW12O40/0.3%La-1.0%N-TiO2possessed the best photocatalytic activity under visible light above 400nm.Thus,imidacloprid were degraded 91.57%after 3hirradiation.When 30%H3PW12O40/0.3%La-1.0%N-TiO2 was used as catalysts,degradation ration could even reach 98.89%after 6h.更多还原