La3+掺杂TiO2粉体的高分子网络凝胶法制备工艺优化及其光催化降解甲基橙性能OA北大核心CSTPCD

La3+-doped TiO2 powder was prepared by using a polymer network gel method,and the preparation process was optimized through orthogonal experiments.The crystalline structure and light absorption properties of TiO2 powder were characterized by BET,XRD,UV-Vis and STEM,while photocatalytic degradation experiments were carried out with methyl orange as a target.The results show that when La3+doped TiO2 powder was prepared by using the polymer network gel method,the calcination temperature had the most significant impact on the optical absorption wavelength of TiO2,followed by the doping amount and the holding time in order.The optimal preparation conditions determined by orthogonal experiments are as follows.La3+doping amount is 0.5%mol,the calcination temperature is 800℃,and the holding time is 30 min.When the calcination temperature was too high or too low,the improvement of photocatalytic activity of La3+doped TiO2 was hindered,and the optimal temperature range was between 650℃and 700℃.La3+doping not only inhibited the transition from anatase to rutile phase,but also inhibited grain growth.When the doping amount of La3+was 1.0%mol,however,the photocatalytic effect was the best.The photocatalytic degradation of methyl orange by titanium dioxide was a zero-level reaction,and doping did not change the type of photocatalytic reaction.