采用二氧化钛悬浮液对二甲基亚砜(DMSO)进行光催化氧化降解研究,并考查催化剂的种类和投加量、溶液pH和DMSO初始浓度、添加Na2S2Os对DMSO降解速率的影响,以寻求DMSO的最优降解条件.结果表明,采用P25型TiO2颗粒、TiO2添加量为1.00 g·L-1、在pH为7、DMSO初始浓度50 μmol·L-1条件下,DMSO的去除率可以达到70％.DMSO的TiO2光催化降解符合一级动力学模型.在TiO2光催化降解DMSO的过程中,Na2S2O8作为电子受体可提高DMSO的光催化降解速率与量子产率,因此对光催化降起到协同作用.%Photocatalytic degradation of DMSO in aqueous TiO2 suspensions was investigated. The effects of catalyst type, catalyst dose, pH and initial concentration on the degradation rate were studied to find the optimal degradation conditions. Langmuir - Hinshelwood kinetic model was used to describe the photocatalytic degradation kinetic of DMSO, and the results showed that the photocatalytic degradation of DMSO met the first -order kinetic. The addition of persulphate, as an electron acceptor, had a positive contribution to the degradation rate of the system. It could increase the photocatalytic degradation rate and apparent quantum yield, appropriate concentration of persul-fate might play a synergistic role in photocatalytic reduction.
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