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Study on Electrocatalytic Destruction of 4-Chlorophenol in Aqueous Solution

Author: LinLiLi
Tutor: SongShuang；HeZhiQiao
School: Zhejiang University of Technology
Course: Environmental Science
Keywords: Pd-Ni/Ni electrode Ti/SnO2-Sb/PbO2 electrode Chlorophenol Electrocatalytic Reduction Electrocatalytic oxidation Mechanism
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 164
Quote: 1
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Abstract


Electrode materials affect the electrode structure, thereby affecting the electrode catalytic performance and service life of the main factors. In this study, prepared Pd-Ni bimetallic complex modified nickel foam electrode (Pd-Ni/Ni) was and lead dioxide doped SnO 2 -Sb middle layer (Ti / SnO 2 -Sb/PbO 2 ) electrode, chlorophenol (4-CP) as the target pollutants, two electrode as the working electrode electrocatalysis of 4-CP reductive dechlorination and electro-catalytic oxidation degradation studies. Characterization Pd-Ni/Ni electrode by scanning electron microscopy (SEM) and X-ray spectroscopy (EDX), we can see the double diameter of the metal particles of Pd-Ni is less than 50 nm, and uniformly dispersed in the foamed nickel substrate. High performance liquid chromatography (HPLC) analysis showed Pd-Ni/Ni electrode ratio Pd / Ni (single metal Pd Modified foamed nickel electrode) or Ni / Ni (single metal Ni modified foamed nickel electrode) electrode has a higher catalytic efficiency, Phenol is the main dechlorinated product. 4-CP initial concentration and elevated temperature of the solution is increased to make the current efficiency is increased, while the reduced With the reduction current to increase the current efficiency. In the the application current of 20mA, the solution temperature 15 ° C, and the initial concentration of 4-CP 1mM conditions ,4-CP dechlorination efficiency up to 82%. In addition, according to the difference of the Pd-Ni/Ni, Pd / Ni of Ni / Ni three electrode electrochemical impedance spectroscopy and their dechlorination efficiency in the current conditions, the inferred rate under different polarization conditions controlling step. With the X-ray diffraction (XRD) and SEM Ti / SnO 2 -Sb/PbO 2 electrode characterization, the results showed that the electrode surface are mainly β-PbO 2 , and the PbO 2 coverage completely, grain arrangement more uniform and dense. At a current density of 10 mA cm -2 , 4-CP initial concentration of 100 mg L -1 as well as supporting electrolyte Na 2 SO 4 concentration of 0.25 M under the conditions, TOC removal rate of 59.8%. With the increase of the current density, target pollutants (4-CP) removal efficiency and TOC removal were increased, but at the same time required for oxidation power (electricity) per unit volume of solution actually adopted also increased. Along with the increase of initial concentration and concentration of the supporting electrolyte, TOC removal were showing slow after the fast and slow down after the trend. ,4-CP in the molecular structure of chlorine substituents removal in the experimental conditions can be transformed into hypochlorite strong oxidizing substances, promote degradation. Finally, based on the experimental results of the rate-determining step and possible degradation mechanism was inferred.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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