低温溶胶法制备W、N-TiO_2/SiO_2/Fe_3O_4磁性光催化剂降解动力学研究

Kinetics of Photo-catalytic Degradation of Methyl Orange by W,N-TiO_2/SiO_2/Fe_3O_4 Magnetic Photocatalyst

采用低温溶胶法制备W、N-Ti O2/Si O2/Fe3O4磁性光催化剂,研究其对有机污水中的甲基橙暗反应吸附规律和光反应催化降解性能。用所制备的W、N-Ti O2/Si O2/Fe3O4磁性光催化剂降解不同浓度的甲基橙,得出其降解反应为一级反应;符合Langmiur-Hinshelwood(L-H)动力学模型,反应速率常数k=2.18 mg/(L·min),表观吸附平衡常数K=0.075(L/mg);反应半衰期随着初始浓度的增加而延长。

W,N-Ti O2/ Si O2/ Fe3O4 magnetic photocatalyst was prepared by low temperature sol-gel method,and its adsorption and catalytic degradation of methyl orange in organic wastewater respectively during the dark reaction and photoreaction was studied. Through degradation of methyl orange with different concentrations by the W,N-Ti O2/ Si O2/ Fe3O4 magnetic photocatalyst,the degradation was confirmed to be a first-order reaction meeting the Langmiur-Hinshelwood（ L-H） kinetics model with reaction rate constant k= 2. 18 mg /（ L·min） and apparent adsorption equilibrium constant K = 0. 075（ L / mg）. The half-life of reaction was found to lengthen with the increase in the initial concentration of methyl orange.