Degradation kinetics and mechanism of polychloromethanes reduction at Co-MoS2 /graphite felt electrode

Mohammed Dauda, Muhammad H. Al-Malack, Chanbasha Basheer*, Mohammad Nahid Siddiqui, Almaz Jalilov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, the electrochemical dechlorination of different polychloromethanes (CCl4, CHCl3, and CH2 Cl2) on a Co-MoS2 graphite felt cathode was investigated. The Co-MoS2 electrocata-lyst was prepared hydrothermally on a graphite felt support. The prepared catalyst’s characterization revealed the formation of hybridized CoSx and MoS2 nanosheets deposited on the pore structures of graphite. The influencing factor for the electro-dechlorination parameters such as applied current density, pH, and sample concentration on the dechlorination rate was optimized. A significant capac-itive reduction current density peak of approximately 1 mA/cm2 was noted for CCl4 at a potential of −0.3 V (vs. AgCl). The dechlorination mechanism was attributed to the stepwise hydrogenolysis mechanism that involves the organochlorides bond cleavage by H* insertion. It was noted that the Co-MoS2 graphite felt electrode exhibited excellent catalytic activity toward the reduction of each of the chlorinated compounds with high selectivity toward the higher-order organochloride. Moreover, the dechlorination rates for each of the compounds were suited to the first-order kinetic model, and the estimated apparent rate constants showed the dechlorination in the following sequence CH2 Cl2 (k3 = 9.1 × 10−5 s−1) < CHCl3 (k2 = 1.5 × 10−3 s−1) < CCl4 (k1 = 2.8 × 10−3 s−1).

Original languageEnglish
Article number929
JournalCatalysts
Volume11
Issue number8
DOIs
StatePublished - Aug 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Catalyst electrode
  • Electrochemical dechlorination
  • Halogenated organics
  • Kinetic model

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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