Degradation Of Diethyl Phthalate By The Technology Of Electrochemistry Coupled With Ozone

Phthalates (phthalic acid esters, PAEs) as a kind of environmental endocrine disruptors, the related pollution problem has attracted much attention. Diethyl phthalate (DEP) was choosed as a model PAEs for degradation and mineralization mechanism of PAEs by the technology of electrochemistry coupled with ozone. The experiments were mainly conducted in a self-made electrochemical reactor with platinum (Pt) electrode was used as the anode. The mixture of oxygen and ozone from the ozone generator was continuous sparged into the reaction solution. The degradation and mineralization of DEP was investigated with three different cathodes, which include carbon felt, reticulated vitreous carbon (RVC) and carbon-polytetrafluoroethylene (carbon-PTFE) electrode. The stability of three different cathodes in the degradation of DEP system was also examined. Tthe results showed that hydrogen peroxide could be in situ generated from the sparged oxygen on three cathodes. The hydroxyl radicals('OH) with strong oxidative activity might be generated by the reaction of hydrogen peroxide with ozone for degradation and mineralization DEP.Compared with the other two cathode materials, the self-made carbon-PTFE electrode system had the most activity for degradation and mineralization of DEP and the total organic carbon(TOC) removal could be up to 91.8% after 1h. The experimental results also showed that the self-made carbon-PTFE cathode exhibited the excellent stability for degradation and mineralization of DEP. It can be seen that the self-made carbon-PTFE electrode has good electrochemical activity and stability in the wastewater treatment of PAEs with the technology of electrochemistry coupled with ozone. High performance liquid chromatography and other large-scale instruments were utilized for the analysis of the degradation and mineralization intermediates of DEP in detail and then the possible mechanism was suggested. The results of this thesis can provide the important theoretical and technical reference for the technology of electrochemistry coupled with ozone to treat phthalic acid ester pollutants in water environment.