This research adopts the diethyl hydroxylamine (DEHA) promote ozone (O3) degradation of dimethyl phthalate (DMP), and established the O3 / DEHA system that can enhanced O3 oxidation ability. It mainly explored the effect of pH, DEHA dosages, ozone flux and DMP dosages in O3 / DEHA system and the oxidation mechanism in the system. And the degradation products were analyzed through gas chromatography /mass spectrometry (GC/MS). Experimental results showed that the DEHA can effectively promote the decomposition of ozone and obviously improved DMP degradation rate under acid condition (pH = 3), the promoting effect was best when DEHA dosage was 25 μΜ. DMP degradation rate increased with the increase of ozone flux, and increased with the decreases of DMP concentration, the reaction conformed to the first order kinetics reaction by dynamics calculation. Adding tert-butyl alcohol (TBA) significantly inhibited the degradation of the DMP, confirmed the ·OH plays an important role in the degradation of DMP under acid condition. Through the analysis of the product, it can be deduced that DMP degradation pathway in O3 / DEHA system mainly started from the chain scission of benzene ring, and then the intermediates transformed to esters molecules and acids which were finally mineralized to water and carbon dioxide.
