Jung, Jong-Tae Kim, Jong-Oh Choi, Jae-Young 2024-01-20T21:36:13Z 2024-01-20T21:36:13Z 2021-09-03 2009-03 0922-6168 https://pubs.kist.re.kr/handle/201004/132688 This study was conducted to investigate the effect of a photocatalysis/oxidant system for the treatment of humic acid and hazardous heavy metals in aqueous solutions. Hydrogen peroxide, ozone, and potassium peroxodisulfate were tested as oxidants. The effect of oxidant concentration was conducted with a pH of 7, a UV intensity of 64 W, and a TiO2 dosage of 0.3 g L-1. The oxidant addition in the UV/TiO2 system enhanced the degradation efficiency of humic acid and hazardous heavy metals compared to no addition of an oxidant. The addition of oxidants over the amounts of H2O2 50 mg L-1, O-3 20 g m(-3), and K2S2O8 50 mg L-1 inhibits the system efficiency. The negative effect of higher oxidant concentrations likely results from OH radical quenching caused by the excess oxidant. Therefore, the optimal dosages of oxidants such as a hydrogen peroxide, ozone, and potassium peroxodisulfate were found to be 50 mg L-1, 20 g m(-3), and 50 mg L-1, respectively. The degradation efficiency of UV/TiO2/oxidant systems for the removal of humic acid and hazardous heavy metals was much greater in the UV/TiO2/H2O2 system using H2O2 as an oxidant. English SPRINGER PHOTOCATALYTIC DEGRADATION TRIHALOMETHANE FORMATION TIO2 WATERS Effect of various oxidants in a photocatalysis/filtration system for the treatment of contaminants Article 10.1007/s11164-009-0034-8 1 RESEARCH ON CHEMICAL INTERMEDIATES, v.35, no.3, pp.243 - 248 RESEARCH ON CHEMICAL INTERMEDIATES 35 3 243 248 scie scopus 000267709200002 2-s2.0-77952474052 Chemistry, Multidisciplinary Chemistry Article; Proceedings Paper PHOTOCATALYTIC DEGRADATION TRIHALOMETHANE FORMATION TIO2 WATERS Photocatalysis Ozone Titanium oxide Persulfate Hydrogen peroxide