Photochemical Degradation of Micropollutants in Aqueous Media

• Published in: IOP conference series. Earth and environmental science Vol. 272; no. 2; pp. 22080 - 22085
• Main Authors: Khandarkhaeva, M S, Batoeva, A A, Sizykh, M R, Aseev, D G, Tsydenova, O V
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.06.2019
• Subjects: Aqueous solutions; Atrazine; Catalysts; Chlorophenol; Environmental degradation; Herbicides; Iron; Micropollutants; Mineralization; Organic carbon; Oxidants; Oxidation; Oxidizing agents; p-Chlorophenol; Photochemicals; Photooxidation; Pollutants; Solar radiation; Total organic carbon; Triclosan
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/272/2/022080

Natural sunlight was employed to enhance degradation of micropollutants in a Fenton-like oxidative system involving persulfate as the oxidant and ferrous iron (Fe(II)) as the catalyst Fe2+/S2O82−/Solar. Experiments were carried out in a bench-scale compound parabolic collector (CPC) and a batch photoreactor. The micropollutants tested were p-chlorophenol, atrazine, and triclosan. The reaction rates and degree of micropollutant degradation increased in the order: {Solar} < {S2O82−/Solar} < {Fe2+/S2O82−} << {Fe2+/S2O82−/Solar}. It was proven that photocatalytic oxidation activated by solar radiation leads not only to complete degradation of micropollutants, but also to substantial drops in levels of total organic carbon in the solution (i.e. leads to mineralization). Based on the results, a method of deep degradation of toxic organic pollutants based on the solar photo-Fenton process Fe2+/S2O82−/Solar was suggested.