Arsenite oxidation by ultrasound combined with ultraviolet in aqueous solution

Seban Lee; Mingcan Cui; Seungmin Na; Jeehyeong Khim

doi:10.1143/JJAP.51.07GD15

Arsenite oxidation by ultrasound combined with ultraviolet in aqueous solution

Seban Lee, Mingcan Cui, Seungmin Na, Jeehyeong Khim

Research output: Contribution to journal › Article › peer-review

11 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 language	English
Article number	07GD15
Journal	Japanese journal of applied physics
Volume	51
Issue number	7 PART2
DOIs	https://doi.org/10.1143/JJAP.51.07GD15
Publication status	Published - 2012 Jul

ASJC Scopus subject areas

General Engineering
General Physics and Astronomy

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title = "Arsenite oxidation by ultrasound combined with ultraviolet in aqueous solution",

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.",

author = "Seban Lee and Mingcan Cui and Seungmin Na and Jeehyeong Khim",

year = "2012",

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doi = "10.1143/JJAP.51.07GD15",

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T1 - Arsenite oxidation by ultrasound combined with ultraviolet in aqueous solution

AU - Lee, Seban

AU - Cui, Mingcan

AU - Na, Seungmin

AU - Khim, Jeehyeong

PY - 2012/7

Y1 - 2012/7

N2 - 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.

AB - 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.

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JO - Japanese journal of applied physics

JF - Japanese journal of applied physics

IS - 7 PART2

M1 - 07GD15

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Arsenite oxidation by ultrasound combined with ultraviolet in aqueous solution

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