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Chemical Engineering Journal, 16 November 2012.
Tugba Olmez-Hanci, Idil Arslan-Alaton.
Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, 34469 Maslak, Istanbul, Turkey.
Abstract
UV-C photo-assisted persulfate (PS), hydrogen peroxide (H2O2) and peroxymonosulfate (PMS) oxidation processes were evaluated and compared for aqueous phenol degradation. The effect of initial oxidant concentration on PS/UV-C, H2O2/UV-C and PMS/UV-C treatment efficiencies was examined on the basis of phenol and total organic carbon (TOC) removals. Complete phenol degradation could be achieved under all examined reaction conditions with apparent phenol degradation rate constants varying between 0.069 ± 0.002 – 0.382 ± 0.003 min−1 accompanied with complete TOC removals (⩾97%) under optimized PS (20 mM), H2O2 (30 mM) and PMS (20 mM) concentrations. Hydroquinone, catechol and benzoquinone were quantified during H2O2/UV-C and PMS/UV-C treatment of phenol verifying a HO-dominated oxidation pathway. During PS/UV-C oxidation, the identification of benzoquinone and 3-phenoxyphenol verified the hydroxycyclohexadienyl radical and phenoxyl radical pathways in SO4.- mediated phenol oxidation.