Arsenite oxidation by ultrasound combined with ultraviolet in aqueous solution

Seban Lee, Mingcan Cui, Seungmin Na, Jeehyeong Khim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study aims to investigate the sonophotochemical oxidation of As(III) to As(V) using the synergistic effect of a strong oxidant that is a hydroxyl radical. The rate constant, k, in the ultrasound (US), ultraviolet C (UV-C), and US/UV-C processes was found to be 1.65 × 10 -4, 3.65 × 10 -4, and 8.31 × 10 -4 s -1 respectively. The highest power densities were 21.26, in the case of UV-C, and 26.27WL -1 for US. Finally, the combined US/ UV-C system gave a synergistic effect value of 1.57. This was similar to the synergistic effect value of the production of hydroxyl radicals with potassium iodide (KI) solution using the same combined process. Moreover, the reaction rate of the As(III) oxidation to As(V) in the US/UV-C process increased with a gradual increase in pH. The reaction rates were found to be 1.88 × 10 -3 at pH 11 and 8.31 × 10 -4 s -1 at pH 7. Therefore, the reaction rate at pH 11 was 2.3 times faster than that at pH 7.

Original languageEnglish
Article number07GD15
JournalJapanese journal of applied physics
Volume51
Issue number7 PART2
DOIs
Publication statusPublished - 2012 Jul

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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