SrTiO_3的合成及其光催化还原CO_2的性能

Synthesis of SrTiO_3 and its performance in photocatalytic reduction of CO_2

本文采用水热合成法制备钙钛矿型半导体光催化剂钛酸锶,紫外光激发下,在甲醇溶液中还原CO2制得甲酸甲酯,并通过负载Ag降低了电子与空穴的复合几率,有效地提高了光催化活性。同时,发现了Ag的负载量、负载方法以及表面活性剂对光催化活性的影响规律。借助XRD分析了催化剂的晶型并计算出颗粒的粒径,SEM、TEM、HRTEM观测了催化剂颗粒的形貌,UV-vis吸收光谱检测了其光激发特性。最终,获得了一步水热法制备Ag含量为5wt%的Ag/SrTiO3具有较高催化活性的优化实验结果。

In this paper,a perovskite type of Ag/SrTiO3 was prepared hydrothermally and used for photocatalytic reduction of CO2 in methanol under illumination of UV light.The loaded nanoparticles of Ag decreased the recombination probability of electron-hole pairs and increased the photocatalytic activity.The effects of loaded amount of Ag,loading procedure and surfactant on their catalytic activities were found.After combining the SEM,TEM and HRTEM analysis on morphology and the particle size,as well as the UV-vis measurement on irritation characteristics of the catalysts,we obtained an optimal catalyst of 5wt%Ag/SrTiO3with higher catalytic activity by a one step hydrothermal method.