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Dechlorination of pentachlorophenol (PCP) in aqueous solution on novel Pd-loaded electrode modified with PPy–SDBS composite film

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Abstract

Pentachlorophenol (PCP) is a persistent pollutant and a suspected human carcinogen. It can be found in the air, water, and soil and enters the environment through evaporation from treated wood surfaces, industrial spills, and disposal at uncontrolled hazardous waste sites. Ecotoxicity of PCP necessitates the development of rapid and reliable remediation techniques. Electrocatalytic hydrogenolysis (ECH) has been proven as a promising method for detoxification of halogenated wastes, due to its rapid reaction rate, low apparatus cost, mild reaction conditions, and absence of secondary contaminants. Challenge for the application of ECH is to prepare a Pd-coated cathode with high stability, high catalytic activity, and low Pd loading level. In this work, Pd/polypyrrole–sodium dodecyl benzene sulfonate/meshed Ti (Pd/PPy–SDBS/Ti) electrode was prepared and was characterized by cyclic voltammetry, scanning electron microscopy, X-ray diffraction, and inductively coupled plasma-atomic emission spectrometry. Electrochemically reductive dechlorination of PCP on the Pd/PPy–SDBS/Ti electrode in aqueous solution was investigated. Pd microparticles were uniformly dispersed on PPy–SDBS film which was previously electrodeposited on the meshed Ti supporting electrode. The loading of Pd on the electrode was 0.72 mg cm−2. Electrocatalytic dechlorination of PCP was performed in a two-compartment cell separated by cation-exchange membrane. The PCP removal on the Pd/PPy–SDBS/Ti electrode could reach 100 % within 70 min with dechlorination current 3 mA when PCP initial concentration was 10 mg L−1 and initial pH was 2.4. Conversion of PCP on the Pd/PPy–SDBS/Ti electrode followed pseudo-first-order kinetics, and the apparent activation energy was 13.0 kJ mol−1. The removal of PCP still kept 100 % after 70 min dechlorination when the Pd/PPy–SDBS/Ti cathode was reused ten times. The electrode exhibited promising dechlorination potential with high electrocatalytic activity, good stability, and low cost.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (51278006), Research Fund for the Doctoral Program of Higher Education of China (20111103110007), The Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (CIT&TCD20130311), and Doctoral Fund of Innovation of Beijing University of Technology (YB201308).

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Authors and Affiliations

  1. College of Environmental & Energy Engineering, Beijing University of Technology, Beijing, 100124, China

    Zhirong Sun, Xuefeng Wei & Huan Zhang

  2. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Xiang Hu

  3. College of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang, 471023, China

    Xuefeng Wei

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  1. Zhirong Sun
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  2. Xuefeng Wei
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  3. Huan Zhang
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  4. Xiang Hu
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Correspondence to Zhirong Sun or Xiang Hu.

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Responsible editor: Angeles Blanco

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Sun, Z., Wei, X., Zhang, H. et al. Dechlorination of pentachlorophenol (PCP) in aqueous solution on novel Pd-loaded electrode modified with PPy–SDBS composite film. Environ Sci Pollut Res 22, 3828–3837 (2015). https://doi.org/10.1007/s11356-014-3641-x

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