微波诱导ClO2催化降解水中DBP反应机理的研究

Reaction mechanism of dibutyl phthalate degradation in water by microwave-induced ClO catalytic oxidation

以邻苯二甲酸二丁酯(DBP)为研究对象,用SPE-GC-MS、UV-Vis及HPLC研究了微波诱导ClO2催化氧化水中DBP的过程。结果表明,与水浴法相比,微波的引入能较好地提高DBP去除率,微波-ClO2-催化剂具有较高的协同氧化效应。微波诱导ClO2催化氧化反应的中间产物为邻苯二甲酸(PA),提出了DBP被氧化降解的反应途径,并指出微波诱导Cl O2催化氧化DBP反应首先进行单电子转移,再进行自由基的氧化反应,进攻位点为芳环侧链的酯基,而不是芳环。

With dibutyl phthalate as the research substrate,the reaction oxidation processes of microwave-induced ClO2 catalytic oxidation in water were studied by solid-phase extraction gas chromatography-mass spectrometry(SPE-GCMS),ultraviolet-visible spectroscopy(UV-Vis) and high performance liquid chromatography(HPLC) techniques.The results showed that the microwave radiation method could improve DBP removals efficiently,compared with water bath method. The microwave-ClO2-catalyst oxidation process had high synergistic oxidation effect. The main intermediate phthalic acid(PA) was identified. Reaction pathways of dibutyl phthalate degradation by microwave-induced ClO2 catalytic oxidation were proposed. A single electron transfer reaction is produced firstly in DBP degradation by microwave-induced ClO2 catalytic oxidation system,followed by a free radical oxidation. It is believed that the radicals formed in microwave-induced ClO2 catalytic oxidation reaction maintain the attack on the alkyl chain rather than the aromatic ring of DBP.