title: A comparative study of HO•- and SO4•--based AOPs for the degradation of non-ionic surfactant Brij30.
abstract: In the present study aqueous solutions of Brij30, an alcohol ethoxylate surfactant, were photocatalytically and photochemically treated by employing the TiO2/UV-A, H2O2/UV-C and persulfate (PS)/UV-C processes. During TiO2/UV-A treatment, even in short reaction periods (10 minutes), high rates of Brij30 removals were achieved; however, longer experiment periods (240-480 minutes) were needed in order to obtain notable total organic carbon (TOC) removals. Increasing the TiO2 dosage exhibited a positive effect on treatment efficiencies. For initial pH value of 3.0, increasing the TiO2 dosage from 1.0 to 1.5 g/L resulted in an improvement in Brij30 removal from 64% to 79% after 10 minutes whereas 68 and 88% TOC removals were observed after 480 minutes, respectively. Brij30 removal was very fast and complete via both H2O2/UV-C and PS/UV-C treatments, accompanied with significant mineralization rates ranging between 74 and 80%. Toxicity assessed by Vibrio fischeri, was found to be similar to that of the original Brij30 solution during H2O2/UV-C treatment, while in the PS/UV-C process, the relative inhibition of Brij30 towards V. fischeri fluctuated throughout the treatment and eventually non-toxic products were formed by the oxidation of SO4•- radicals.
authors.affiliation: Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey E-mail: kabdasli@itu.edu.tr.
authors.forename: Işık
authors.initials: I
authors.lastname: Kabdaşlı
authors.affiliation: Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey E-mail: kabdasli@itu.edu.tr.
authors.forename: Çisem
authors.initials: Ç
authors.lastname: Ecer
authors.affiliation: Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey E-mail: kabdasli@itu.edu.tr.
authors.forename: Tugba
authors.initials: T
authors.lastname: Olmez-Hanci
authors.affiliation: Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey E-mail: kabdasli@itu.edu.tr.
authors.forename: Olcay
authors.initials: O
authors.lastname: Tünay
mesh_terms: D048908:Aliivibrio fischeri / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D000077423:Polidocanol; D011092:Polyethylene Glycols / Q000737:chemistry* / Q000494:pharmacology; D013431:Sulfates / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry* / Q000494:pharmacology; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000494:pharmacology; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D013431:Sulfates; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D000077423:Polidocanol; D011092:Polyethylene Glycols; D006861:Hydrogen Peroxide