研究了农药灭多威在ＴｉＯ２光催化下的降解产物、反应动力学及影响降解速率的因素．灭多威在ＴｉＯ２催化下１０ｍｉｎ内可被完全转换为无机物而失去毒害作用．ＩＲ研究表明，灭多威的分解产物为ＮＨ４＋、ＳＯ４２－和ＣＯ２，其分解过程为准一级反应．除铜和氯离子在低浓度时有促进作用，而高浓度为阻碍作用外，大部分阴、阳离子对降解均有不利影响． The degradation products, reaction kinetics and the factors affecting the degradation rate of pesticide methomyl under TiO2 photocatalysis were studied. Methomyl in TiO2 catalyzed within 10min can be completely converted to inorganic loss of toxic effects. IR studies have shown that the decomposition of methomyl is NH4 +, SO42- and CO2, the decomposition process quasi-first-order reaction. In addition to the role of copper and chloride ions in the promotion of low concentrations, while the high concentration of obstruction, most of the negative and positive ions have an adverse effect on the degradation.