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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/67841

    Title: Hydroxyl radical scavenging role of chloride and bicarbonate ions in the H2O2/UV process
    Authors: Chih-Hsiang Liao;Shyh-Fang Kang;Fu-An Wu
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: Advanced oxidation processes;Chlorobutane;Hydrogen peroxide;Ultraviolet light;Photolysis
    Date: 2001-08-01
    Issue Date: 2013-06-13 11:30:36 (UTC+8)
    Publisher: Camden: Elsevier Ltd
    Abstract: Simultaneous effect of inorganic anions, such as chloride and bicarbonate ions, on the scavenging of hydroxyl radicals (HO*) in the H2O2/UV process is the focus of this paper. The model compound of n-chlorobutane (BuCl) was used as the probe of HO*. By changing the pH conditions (2-9) and the concentrations of NaCl (0.25-2500 mM) and NaHCO3 (25 mM), the variation of HO* concentrations and the rate of H2O2 decomposition were compared. In general, the BuCl and H2O2 follow closely the first-order reaction within the first 10 and 40 min, respectively. In the presence of chloride alone at the pH range of 2-6, the HO* concentration in the reaction mixture increases with the increase of pH, and the HO* concentration at pH = 6 is 100 times of that at pH = 2. Including bicarbonate species in the solution, the peak HO* concentration was found at a certain pH, which shifts from 4, 5, to 5-7, as the molar ratios of chloride/bicarbonate species increase from 1 to 100. In addition, without bicarbonate species HO* concentration decreases significantly with increasing chloride concentration but remained rather unchanged beyond 1250 mM. In contrast, the HO* scavenging in the presence of bicarbonate species became relatively significant only when the chloride concentration reached beyond 250 mM. Throughout all experiments of different water quality conditions, the H2O2 decomposition rate remains rather unchanged.
    Relation: Chemosphere 44(5), pp.1193-1200
    DOI: 10.1016/S0045-6535(00)00278-2
    Appears in Collections:[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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