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High efficient degradation of dimethyl phthalate from Cu(II) and dimethyl phthalate wastewater by EDTA enhanced ozonation: Performance, Intermediates and Mechanism
Abstract and Figures：In this study, the presence of Cu(II) ions was found for the first time to severely inhibit +-dimethyl phthalate (DMP) degradation by ozone due to the formation of the stable complex Cu(II)-DMP. However, 100% DMP removal was rapidly reached when ethylenediamine tetraacetic acid (EDTA) was added with a Cu(II)/EDTA molar ratio of 3:1. Subsequent studies indicated that Cu(II)-DMP is sequestrated by EDTA, then DMP was degraded and Cu(II) was removed by precipitation. The freshly formed Cu-EDTA2− and organic nitrogen intermediates further decomposed O3 into %OH, which induced to the rapid degradation of DMP. The kobs of CuEDTA/O3 were 9–10 times greater than the kobs of DMP removed by ozonation alone within 10 min. The reaction mechanism involved a %OH generation was proposed. The %OH and O2%- are generated from the rapid reaction between ozone and EDTA. Acting as a more strongly negative species, the specific Cu(II) in Cu-EDTA complexes is more inclined to react with O2%- to give Cu(I), accelerating the forward reaction to produce more %OH. The synergistic removal of DMP and Cu(II) can be achieved after reaction. Therefore, this study provides an effective method to dispose metal ion and organic pollutant wastewater.
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