Optimization of Processes Conditions of La3+-doped TiO2 Powder by Polymer Network Gel Method and its Photocatalytic Degradation of Methyl Orange Performance
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.
Titanium dioxideLa3+dopingPolymer network gel methodOrthogonal experimentMethyl orange
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