Degradation of acetic acid with sulfate radical generated by persulfate ions photolysis.
The photolysis of S(2)O(8)(2-) was studied for the removal of acetic acid in aqueous solution and compared with the H(2)O(2)/UV system. The SO(4)(-) radicals generated from the UV irradiation of S(2)O(8)(2-) ions yield a greater mineralization of acetic acid than the ()OH radicals. Acetic acid is oxidized by SO(4)(-) radicals without significant formation of intermediate by-products. Increasing system pH results in the formation of ()OH radicals from SO(4)(-) radicals. Maximum acetic acid degradation occurred at pH 5. The results suggest that above this pH, competitive reactions with the carbon mineralized inhibit the reaction of the solute with SO(4)(-) and also ()OH radicals. Scavenging effects of two naturally occurring ions were tested; in contrast to HCO(3)(-) ions, the presence of Cl(-) ions enhances the efficiency of the S(2)O(8)(2-)/UV process towards the acetate removal. It is attributed to the formation of the Cl() radical and its great reactivity towards acetate.
Criquet
Justine
J
UMR CNRS, Ecole Supérieure d'Ingénieurs de Poitiers, Université de Poitiers, France.
Leitner
Nathalie Karpel Vel
NK
D019342:Acetic Acid / Q000378:metabolism*; D001639:Bicarbonates / Q000737:chemistry; D052918:Environmental Restoration and Remediation; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010782:Photolysis; D013431:Sulfates / Q000737:chemistry*; D014466:Ultraviolet Rays
D001639:Bicarbonates; D013431:Sulfates; C069025:sulfate radical; D019342:Acetic Acid