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Oxidative Coupling Reaction of Purified Aldrich Humic Acid by Horseradish Peroxidase  

Jee, Sang-Hyun (Department of Civil Engineering, Kyung Hee University)
Kim, Do-Gun (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Kim, Jeong-Hyun (Department of Civil Engineering, Kyung Hee University)
Ko, Seok-Oh (Department of Civil Engineering, Kyung Hee University)
Publication Information
Abstract
Oxidative coupling reactions of humic substances (HS) can be catalyzed by a variety of natural extracellular enzymes and metal oxides. In this study, property changes of HS induced by a natural enzyme, horseradish peroxidase (HRP), and the effect of it to microfiltration (MF) were investigated. PAHA was transformed by oxidative coupling reaction with HRP and hydrogen peroxide ($H_2O_2$), verifying the catalytic effects of the HRP. Size exclusion chromatography (SEC) revealed that weight-average molecular weight (MWw) of PAHA was proportionally increased with the dosages of HRP and $H_2O_2$, indicating the transform action of HS into larger and complex molecules. An increase in the conformational stability of HS was achieved through the promotion of intermolecular covalent bondings between heterogeneous humic molecules. Spectroscopic analysis (fluorescence and infrared spectroscopy) proved that functional groups were transformed by the reaction. Additionally, HS and transformed products were undergone microfiltration (MF) to examine the treatment potential of them in a water treatment facility. Original HS could not be removed by MF but larger molecules of transformed products could be removed. Meanwhile, transformed products caused more fouling on the filtration than original HS. This results proved that natural organic matter (NOM) can be removed by MF after its increase in molecular size by oxidative coupling reaction.
Keywords
Humic Acid; Oxidation Coupling Reaction; Horseradish peroxidase (HRP); Hydrogen Peroxide ($H_2O_2$); Catalytic Effect;
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