Oxidative Degradation of Dimethyl Phthalate (DMP) by Persulfate Catalyzed by Ag⁺ Combined with Microwave Irradiation

Abstract:

The removal of dimethyl phthalate (DMP), which is a pollutant of concern in water environments, was carried out by sodium persulfate (SPS,Na₂S₂O₈) catalyzed by Ag⁺ combined with microwave irradiation. Effects of persulfate concentration, reaction time, microwave(MW) power and catalytic ion Ag+ on the degradation efficiency of DMP by persulfate were examined in batch experiments. The results showed that optimum Na2S2O8 concentration was 0.083mmol/L, and Ag+ concentration was 0.042 mmol/L. Increasing the MW irradiation time , persulfate concentration or Ag+ concentration might significantly accelerate DMP degradation. Catalytic ion Ag⁺ combined with microwave irradiation was an rapid method to activate persulfate, and thus to produce SO₄⁻ • which was a powerful oxidant and could degrade DMP effectively. About 80% of DMP and 70% of COD could be degraded in 140s under the conditions of 800W MW power.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 1209-1212
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.1209
• Online since: December 2012
• Authors: De Dong Sun, Xiao Xu Yan, Wen Ping Xue
• Keywords: Catalytic Oxidation, Dimethyl Phthalate, Microwave, Persulfate, Sulfate Radical

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