纳米TiO_2光催化降解聚乙二醇反应

Photocatalytic Degradation of Polyethylene Glycol with TiO_2 Nanoparticles

以纳米TiO2为光催化剂,对聚乙二醇(PEG)水溶液进行光催化降解实验。生成物CO2的量及剩余反应物浓度随时间变化的结果表明,反应为零级反应,且催化反应速率与PEG平均分子量成反比。热重、核磁共振波谱的检测结果证实,降解过程中有低分子量聚乙二醇和甲酸酯及其他低分子量酯等中间产物生成,最终矿化为CO2和H2O。

The photocatalytic degradation of polyethylene glycol（PEG） with TiO2 nanoparticles as the photo-catalyst was investigated. The fact that the amount of CO2 and the concentration of residue varied with reaction time indicates that it is a reaction of zero order and the degradation rate of PEG is negatively proportional to the average molecular weight of PEG. TGA and NMR results show that low molecular weight PEG, esters and other intermediates were produced during the degradation reaction. PEG was finally mineralized to CO2 and H2O.