TY - JOUR
T1 - Mineralization of organic acids by the photo-electrochemical process in the presence of chloride ions
AU - Shih, Yu Jen
AU - Chen, Kuan Hsiang
AU - Huang, Yao Hui
PY - 2014/5
Y1 - 2014/5
N2 - This investigation demonstrates an indirect chloride photo-electrochemical method for mineralizing the organic acids (5mM), including acetic, maleic, malonic, citric, oxalic, and succinic acids. The electrolytic reactor (12cm×12cm×30cm) held 2.5L solution, in which both anode and cathode were the titanium-based dimensionally stable anode (Ti-DSA) that was coated with RuO2/IrO2. Different active chlorine species with various redox potentials, including OCl-, HOCl, and Cl2, produced in NaCl medium were the major oxidants depending on the pH of the electrolysis. The results revealed that a pH in the range 2.5-7 maximized the removal rate of total organic carbon (TOC) of citric acid solution. The UV-254nm light was then utilized in the NaCl electrolysis to support a photo-electrochemical reaction. The substantial improvement in the mineralization efficiency for all organic acids was attributed to the hydroxyl radicals (OH) and chlorine radicals (Cl) from HOCl upon activation by the UV irradiation.
AB - This investigation demonstrates an indirect chloride photo-electrochemical method for mineralizing the organic acids (5mM), including acetic, maleic, malonic, citric, oxalic, and succinic acids. The electrolytic reactor (12cm×12cm×30cm) held 2.5L solution, in which both anode and cathode were the titanium-based dimensionally stable anode (Ti-DSA) that was coated with RuO2/IrO2. Different active chlorine species with various redox potentials, including OCl-, HOCl, and Cl2, produced in NaCl medium were the major oxidants depending on the pH of the electrolysis. The results revealed that a pH in the range 2.5-7 maximized the removal rate of total organic carbon (TOC) of citric acid solution. The UV-254nm light was then utilized in the NaCl electrolysis to support a photo-electrochemical reaction. The substantial improvement in the mineralization efficiency for all organic acids was attributed to the hydroxyl radicals (OH) and chlorine radicals (Cl) from HOCl upon activation by the UV irradiation.
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U2 - 10.1016/j.jtice.2013.09.010
DO - 10.1016/j.jtice.2013.09.010
M3 - Article
AN - SCOPUS:84895928088
VL - 45
SP - 962
EP - 966
JO - Journal of the Taiwan Institute of Chemical Engineers
JF - Journal of the Taiwan Institute of Chemical Engineers
SN - 1876-1070
IS - 3
ER -