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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。
The H3PW12O40 / La-N-TiO2 catalyst was prepared and characterized by infrared spectroscopy, N2 adsorption-desorption analysis, transmission electron microscopy and ultraviolet diffuse reflectance spectroscopy. The results of FTIR showed that the Keggin structure was retained in the composite catalyst H3PW12O40. After La-N was doped, the BET specific surface area of the composite catalyst was twice that of the parent TiO2. Transmission electron microscopy showed that the catalyst consisted of relatively uniform spherical particles with dispersibility Good; UV diffuse reflectance test showed that the composite catalyst prepared by doping La and N elements can obviously improve the light response performance. The photocatalytic activity of imidacloprid showed that 30% H3PW12O40 / 0.3% La-1.0% N-TiO2 had the best photocatalytic activity (≥400nm) and the degradation rate of imidacloprid was 91.57% After 6 hours, the degradation rate of imidacloprid was 98.89%, which was almost completely degraded.