以MnCl2電化學氧化法礦化有機酸之研究

天龍

doi:10.6844/NCKU.2012.00246

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以MnCl2電化學氧化法礦化有機酸之研究

Mineralization of Organic Acid in the presence of MnCl2 by Electrochemical Oxidation Method

天龍 , Masters　　Advisor：黃耀輝　　

英文 DOI： 10.6844/NCKU.2012.00246

電解氧化； Ti-DSA ； MnCl2 ； HOCl ； ε-MnO2 ； Electrochemical oxidation ； MnCl2 ； HOCl ； ε-MnO2 ； Ti-DSA

Abstract │ Reference (185) │ Altmetrics

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The electrochemical oxidation of numerous organic species is investigated under reaction with chlorine system. The electrolysis of chloride salts can give rise to the chlorine chemistry, in which the presence of HOCl dominated by pH condition has a great impact on the degradation of organic acids. Meanwhile, among the electrolytes, including Mg, Na, and Fe chloride salts, the manganese cations can be electrically and chemically oxidized to ε-MnO2 which is deposited directly on the anode surface resulting in a high voltage. The electrolytic reactor (12x12x40 cm3) can accommodate 3.5 L solution in a batch reaction in which both anode and cathode were made of titanium coated with RuO2/IrO2 (Ti-DSA). The oxidation rate of organic acid and the crystal structure of manganese dioxide are determined by the electrolytical parameters, including the pH value, current density, temperature and the electrode material. The results showed that the electrolysis of 20 mM MnCl2 using Ti-DSA electrode (current 1A, pH 3) is much more efficient to completely mineralize the oxalic acid (2 mM) in 60 minutes (TOCr ≥ 98%) than the electrolysis of Mg, Na, and Fe chloride salts. Furthermore, the electrochemical system of MnCl2 (current 5A, pH 3) substantially improves the TOC removal of citric acid (0.694 mM) in 2 hours (TOCr ≥ 94%). Of the chlorine species, HOCl has relatively high activity for the degradation of organic acids. Besides, the ε-MnO2 was also valid to oxidize the organic acids solely. A novel chloride electrochemical technology combined the ε-MnO2 deposition on anode has proved to be a potential process particularly for managing the wastewater of organic acids.

Reference ( 185 ) 〈TOP〉

[1] R. J. Watts and A. L. Teel, "Chemistry of Modified Fenton's Reagent (Catalyzed H2O2 Propagations--CHP) for In Situ Soil and Groundwater Remediation," Journal of Environmental Engineering, vol. 131, pp. 612-622, 2005.
連結：
[2] R. J. Watts and A. L. Teel, "Treatment of Contaminated Soils and Groundwater Using ISCO," Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management, vol. 10, pp. 2-9, 2006.
連結：
[3] Y. E. Yan and F. W. Schwartz, "Kinetics and Mechanisms for TCE Oxidation by Permanganate," Environmental Science & Technology, vol. 34, pp. 2535-2541, 2000.
連結：
[4] Y.-H. Huang, Y.-J. Shih, and C.-H. Liu, "Oxalic Acid Mineralization by Electrochemical Oxidation Processes," Journal of Hazardous Materials, vol. 188, pp. 188-192, 2011.
連結：
[5] C. Comninellis and A. Nerini, "Anodic Oxidation of Phenol in the Presence of Nacl for Wastewater Treatment," Journal of Applied Electrochemistry, vol. 25, pp. 23-28, 1995.
連結：

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