Oxidation of methylated arsenic species by UV/S2O82-
- Oxidation of methylated arsenic species by UV/S2O82-
- 윤성환; 이석헌; 김태훈; 이명주; 유승호
- UV/S2O8 2-; UV/H2O2; UV/TiO2; OHㆍradical; SO4ㆍ-radical
- Issue Date
- Chemical engineering journal
- VOL 173, 290-295
- 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.
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