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Phthalate esters (PAEs) are used as plasticizers to impart flexibility and resilience to plastic products. In recent years, PAEs are a controversial issue because many phthalates are suspected to be mutagens, hepatotoxic agents and endocrine disruptors, and can lead to adverse effects on organisms even in a low concentration. Recently, sulfate (SO 4 · - ) radical based advanced oxidation processes have attracted great scientific interest due to their high efficiency in the degradation and mineralization of recalcitrant and/or toxic organic pollutants. In the present study aqueous dimethyl phthalate (DMP; 100 mg L -1 ), being selected as a model PAE, was treated by the persulfate (PS)/UV-C process at pH 3 and varying PS concentrations (0-60 mM). DMP and TOC abatements increased with increasing PS concentrations from 5 to 40 mM. Further increase in the initial PS concentration, however, reduced both the rate and extent of DMP and TOC removals. The highest pseudo-first-order abatement rate coefficient and electrical energy per order (EE/O) values obtained for DMP treatment with PS/UV-C oxidation were found as 0.4493 min -1 and 1.79 kWh m -3 order -1 , respectively, for PS = 30 mM, pH = 3, DMP = 100 mg L -1 . The second-order reaction rate coefficient for DMP with SO 4 · - was determined as 1.47×10 9 M -1 s -1 by the application of competition kinetics using phenol as the probe compound. Within the scope of the present study, aqueous DMP was also subjected to peroxymonosulfate (PMS)/UV-C and hydrogen peroxide (HP)/UV-C treatments. The performance of PS/UV-C treatment was found to be higher than that of PMS/UV-C and HP/UV-C treatments both in terms of DMP and TOC abatement rates at an initial oxidant concentration of 5 mM.

Performance of the Persulfate/UV-C Process for the Treatment of Dimethyl Phthalate from Aquatic Environments