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Open AccessArticle

A Polypyrrole-Modified Pd-Ag Bimetallic Electrode for the Electrocatalytic Reduction of 4-Chlorophenol

1
College of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology, Luoyang 471023, China
2
Luoyang Key Laboratory of Soil Pollution Remediation Project, Henan University of Science and Technology, Luoyang 471023, China
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(11), 931; https://doi.org/10.3390/catal9110931
Received: 16 October 2019 / Revised: 5 November 2019 / Accepted: 5 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Palladium-Catalyzed Reactions)
A polypyrrole-modified bimetallic electrode composed of Pd-Ag on a Ti substrate (Pd-Ag/PPY/Ti) was successfully prepared via a chemical deposition method, and was applied to the electrocatalytic hydrodechlorination of 4-chlorophenol (4-CP) in aqueous solution. The electrode was characterized by cyclic voltammetry (CV), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Various influences on the dechlorination efficiency of 4-chlorophenol, including applied current, initial pH value, and temperature, were studied. The dechlorination efficiency of 4-CP reached 94% within 120 min under the optimum conditions, i.e., a dechlorination current of 6 mA, an initial pH of 2.30, and a temperature of 303 K. The apparent activation energy of the dechlorination of 4-CP by the Pd-Ag/PPY/Ti electrode was calculated to be 49.6 kJ/mol. The equivalent conversion rate constant kPd was 0.63 L.gPd−1·min−1, which was higher than the findings presented in comparable literature. Thus, a highly effective bimetallic electrode with promising application prospects and low Pd loading was fabricated. View Full-Text
Keywords: electrocatalytic hydrodechlorination; Pd-Ag; bimetallic electrode; electroless plating; 4-chlorophenol electrocatalytic hydrodechlorination; Pd-Ag; bimetallic electrode; electroless plating; 4-chlorophenol
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MDPI and ACS Style

Wei, X.; Zeng, L.; Lu, W.; Miao, J.; Zhang, R.; Zhou, M.; Zhang, J. A Polypyrrole-Modified Pd-Ag Bimetallic Electrode for the Electrocatalytic Reduction of 4-Chlorophenol. Catalysts 2019, 9, 931.

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