Add time:07/30/2019         Source:sciencedirect.com

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 Cu-EDTA/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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