Degradation of acesulfame in aqueous solutions by electro-oxidation

作者：Punturat Voramin; Huang Kuo Lin^*

来源：Journal of the Taiwan Institute of Chemical Engineers, 2016, 63: 286-294.

DOI：10.1016/j.jtice.2016.03.016

• Acesulfame degradation
• Electro-oxidation
• Boron-doped diamond (BDD) electrode
• Biodegradation-resistant pollutant
• Municipal wastewater treatment

The electrochemical oxidation of acesulfame (acesulfame potassium (ACE-IC)) on different electrodes or in various aqueous solutions was investigated in this study. The performance in terms of ACE-K degradation and total organic carbon (TOC) removal of tested anodes was in the order boron-doped diamond (BDD) > PbO2 > Pt, although ACE-IC could not be directly oxidized on these electrodes in cyclic voltammetric analysis. At the same electrolysis time, the ACE-IC degradation and TOC removal efficiencies increased with an increasing current density or anode area, but decreased with the increase of initial ACE-IC concentration. The ACE-K degradation was slightly influenced by temperature at 25-50 degrees C. The apparent pseudo-first-order rate constants of ACE-K oxidation were similar in ACE-IC-spiked 1 M Na2SO4 solution and municipal wastewater matrices (influent (IN), before biological treatment (BBT), and after biological treatment (ABT)) ((1.73-2.32) x 10(-3) s(-1)). Although the TOC removal (consistent with mineralization current efficiency) in these wastewater matrices followed the order ABT approximate to IN > BBT, the complete mineralization of ACE-IC and TOC was achieved. Accordingly, the electrooxidation process has great potential to be used to improve the biodegradation-resistant ACE-K degradation and TOC removal in secondary biological wastewater treatment.

• 出版日期2016-6