Yoon, Sung-Hwan Lee, Seockheon Kim, Tae-Hun Lee, Myunjoo Yu, Seungho 2024-01-20T16:30:21Z 2024-01-20T16:30:21Z 2021-09-05 2011-09-15 1385-8947 https://pubs.kist.re.kr/handle/201004/129985 UV/S2O82- process was studied for the oxidation of monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) in aqueous solution. UV/H2O2 and UV/TiO2 were also applied to the oxidation of the target compounds. TiO2 was added at a low dosage (50 mg/L), considering a condition advantageous for catalyst separation. Under the experimental condition of this study ([S2O82-](0) = [H2O2](0) = 1 mM, [TiO2](0) = 50 mg/L), UV/S2O82- was more effective for oxidizing MMA and DMA than UV/H2O2 and UV/TiO2. The oxidation rate of DMA by UV/S2O82- could be accelerated by increasing the ratio of [S2O82-]/[DMA]. The oxidation efficiencies of MMA and DMA by UV/S2O82- were lower at initial pH 7 than at initial pH 3 and 10. This phenomenon was attributable to the radical-scavenging effect of bicarbonate, which was added as a pH-buffering solute. The results shown in this study show that UV/S2O82- is an effective oxidation process for MMA and DMA. (C) 2011 Published by Elsevier B.V. English ELSEVIER SCIENCE SA PHOTOCATALYTIC OXIDATION PHOTOCHEMICAL OXIDATION DIMETHYLARSINIC ACID PHENYLARSONIC ACID HYDROGEN-PEROXIDE ORGANOARSENIC COMPOUNDS OXIDIZING-AGENT WATER-TREATMENT DRINKING-WATER AQUEOUS-MEDIA Oxidation of methylated arsenic species by UV/S2O82- Article 10.1016/j.cej.2011.04.057 1 CHEMICAL ENGINEERING JOURNAL, v.173, no.2, pp.290 - 295 CHEMICAL ENGINEERING JOURNAL 173 2 290 295 scie scopus 000295753700003 2-s2.0-80052567506 Engineering, Environmental Engineering, Chemical Engineering Article PHOTOCATALYTIC OXIDATION PHOTOCHEMICAL OXIDATION DIMETHYLARSINIC ACID PHENYLARSONIC ACID HYDROGEN-PEROXIDE ORGANOARSENIC COMPOUNDS OXIDIZING-AGENT WATER-TREATMENT DRINKING-WATER AQUEOUS-MEDIA UV/S2O82- UV/H2O2 UV/TiO2 SO4 center dot- radical OH center dot radical Monomethylarsonic acid (MMA) Dimethylarsinic acid (DMA)