Abstract
UV/S 2O 8 2− process was studied for the oxidation of monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) in aqueous solution. UV/H 2O 2 and UV/TiO 2 were also applied to the oxidation of the target compounds. TiO 2 was added at a low dosage (50 mg/L), considering a condition advantageous for catalyst separation. Under the experimental condition of this study ([S 2O 8 2−] 0 = [H 2O 2] 0 = 1 mM, [TiO 2] 0 = 50 mg/L), UV/S 2O 8 2− was more effective for oxidizing MMA and DMA than UV/H 2O 2 and UV/TiO 2. The oxidation rate of DMA by UV/S 2O 8 2− could be accelerated by increasing the ratio of [S 2O 8 2−]/[DMA]. The oxidation efficiencies of MMA and DMA by UV/S 2O 8 2− 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/S 2O 8 2− is an effective oxidation process for MMA and DMA.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
