Formation of Hydrogen Peroxide by the Ozonation of Aqueous Humic Acid

Kim, Kei Woul; 김계월; Rhee, Dong Seok; 이동석

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P-ISSN1225-0163
E-ISSN2288-8985
SCOPUS, ESCI, KCI

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P-ISSN 1225-0163
E-ISSN 2288-8985

e-Submission

Vol.13, No.5

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Formation of Hydrogen Peroxide by the Ozonation of Aqueous Humic Acid

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985

2000, v.13 no.5, pp.659-665

Kim, Kei Woul
Rhee, Dong Seok

Kim, K. W., & Rhee, D. S. (2000). Formation of Hydrogen Peroxide by the Ozonation of Aqueous Humic Acid. , 13(5), 659-665.

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Abstract

The changes in $UV_{254}$ and concentrations of $H_2O_2$ formed by ozonation of aqueous humic acid in ozone/high pH, peroxone process and in the presence of radical scavenger, $HCO_3{^-}$ were investigated. This study confirmed that the formation of $H_2O_2$ by ozonation may undergo different reaction pathways compared to those of $UV_{254}$ reduction in the degradation of the humic acid. The concentration of $H_2O_2$ produced by ozonation was found to be increased with decreasing pH of the sample solution due to the higher stability of ozone molecules at acidic conditions. On the while, $UV_{254}$ reduction was found to be higher at alkaline conditions or larger amount of $H_2O_2$ additions as a radical promoter in which the producing of ${\cdot}OH$, ${\cdot}HO_2$ radicals can be more favorable. From the results, it has been suggested that the formation of $H_2O_2$ by ozonation depends mainly on the direct reactions of ozone with humic acid molecules, while $UV_{254}$ reduction is affected by both the indirect reactions of the radicals and direct reactions of ozone with humic acid.