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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/10790

    Authors: Ting-Nien Wu(吳庭年)
    Jr-Wei Wang
    Contributor: 圖書資訊館
    Keywords: Electrolysis
    Pt elect
    Date: 2010
    Issue Date: 2010-09-13 14:57:59 (UTC+8)
    Abstract: This study investigated the electrochemical dechlorination of pentachlorophenol (PCP) under
    the oxidative and reductive control with Pt electrodes. Lab experiments were conducted in a spiltless
    bath type reactor equipped with a Pt electrode as working electrode, a Pt wire as counter electrode,
    and an Ag/AgCl electrode as reference electrode. The constant-potential experiments were
    conducted by the control of an electrochemical analyzer, and three electrolytes including 1 M
    Na2SO4, KCl, and KI were tested for their suitability of facilitating PCP dechlorination. The
    conditions of the oxidative and reductive control in various electrolyte solutions were determined
    based on the results of cyclic voltammetry. The electrochemical removal of PCP was found efficient
    for all three tested electrolytes with the overpotential of hydrogen reduction, while the disappearance
    of PCP was only occurred in a 1 M KI solution with the overpotential of oxygen oxidation. The
    formation of the redox couple I3
    -/I- was observed in a 1 M KI solution with the oxidative control that
    might act as mediator to initiate indirect oxidation of PCP. The oxidative degradation of PCP was
    intensified with increasing positive potential, and the complete disappearance of PCP resulted in
    only 60% of dechlorination with the overpotential of oxygen oxidation. The reductive degradation of
    PCP works efficiently when applying the overpotential of hydrogen reduction, and it is ascribed to
    the formation of H atoms from water electrolysis that might dechlorinate the adsorbed PCP on the
    electrode surface. The complete dechlorination of PCP was not observed through the reductive
    degradation, and the progressive dechlorination revealed that the dichloro- and trichloro-phenolic
    compounds might be the intermediate products based on 50% release of chloride ions from PCP.
    Appears in Collections:[環境工程系所] 期刊論文

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