溶胶凝胶法制备LaMn1-XVXO3及光催化氧化性能

Preparation and Photocatalytic Oxidation of LaMn1-XVXO3 by Sol-Gel Method

摘要:

以La(NO₃)₂、MnC₄H₆O₂、柠檬酸和乙二醇(EG)为主要原料,NH₄VO₃为掺杂试剂,采用溶胶凝胶法制备LaMnO₃和LaMn_1-XV_XO₃粉体。采用XRD进行晶体结构表征；采用甲基橙(MO)模拟污水,进行光催化降解实验。研究了煅烧温度、催化剂用量和掺杂量对光催化氧化降解率的影响,讨论MO降解的动力学规律。结果表明700-900 ℃煅烧温度不影响LaMnO₃晶体结构和光催化氧化降解率；掺杂量影响LaMn_1-XV_XO₃晶体结构,光催化氧化降解率随着掺杂量增加而呈下降趋势；光催化氧化实验中,LaMn_1-XV_XO₃粉体效果高于LaMnO₃,两者均符合一级动力学方程。

Abstract:

Using La(NO₃)₂, MnC₄H₆O₂, citric acid and ethylene glycol (EG), LaMnO₃and LaMn_1-XV_XO₃powers were prepared by Sol-gel with dopant NH₄VO₃. The cayalst were characterized by XRD and used methy orange (MO) as object on photocatalytic oxidation experiment. And effect of heat temperature, cayalyst mass and dopant amount were discussed on degradation rate of MO respectively. The kinetic equations of the process of MO photodegradation were explored. The results show that crystal structure and photocatalytic oxidation degradation rate of MO by LaMnO₃ had been not affect by calcination temperature higher than 700 _oC; the photocatalytic oxidation degradation rate of MO by LaMn_1-XV_XO₃decreased with the increase of the doping amount due to effect of V ion on LaMn_1-XV_XO₃crystal structure; the catalysts were followed first-order kinetic.