Degradation of acetic acid with sulfate radical generated by persulfate ions photolysis

• Published in: Chemosphere (Oxford) Vol. 77; no. 2; pp. 194 - 200
• Main Authors: Criquet, Justine, Leitner, Nathalie Karpel Vel
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2009; Elsevier
• Subjects: Acetates; Acetic acid; Acetic Acid - metabolism; Air. Soil. Water. Waste. Feeding; Animal, plant and microbial ecology; Applied ecology; Applied sciences; Bicarbonates - chemistry; Biological and medical sciences; Byproducts; Carboxylic acids; Chemical Sciences; Degradation; Ecotoxicology, biological effects of pollution; Environment. Living conditions; Environmental Engineering; Environmental Restoration and Remediation; Environmental Sciences; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Hydrogen-Ion Concentration; Medical sciences; Mineralization; Other; Oxidation-Reduction; Persulfate; Photolysis; Pollution; Public health. Hygiene; Public health. Hygiene-occupational medicine; Radicals; Scavenging; Sulfate radical; Sulfates - chemistry; Ultraviolet Rays; Sulfate radical; Carboxylic acids; Photolysis; Mineralization; Persulfate; Carboxylic acid; Pollutant behavior; Acetic acid; Sulfates; Organic compounds; Photochemical degradation
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2009.07.040

The photolysis of S 2 O 8 2 - was studied for the removal of acetic acid in aqueous solution and compared with the H 2O 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.