Review on the progress and evaluation on the application feasibility of electrocatalytic hydrodechlorination technology in detoxificiation of chlorinated organic pollutants
The massive use of the chlorinated organic compounds in the pharmaceutical,pesticide and dye industries has led to their overexposure in environment.Due to the bearing carbon-chlorine(C-Cl)bonds,chlorinated organic pollutants(COPs)are generally chemically stable and highly resistant to natural degradation.They are also highly toxic,carcinogenic and bio-accumulative,thus delivering significant environmental risks.Electrocatalytic hydrodechlorination(EHDC)represents a promising technology for COPs treatment.It proceeds by the in-situ generation of atomic hydrogen(H)on the catalyst surface via water dissociation.These H* are highly active for the hydrodechlorination of C—Cl bonds,which enable the conversion of the C—Cl bond and Cl atom to the C—H bond and Cl-,respectively.Overall,the EHDC process can significantly reduce the molecular toxicity and chemical stability of COPs,and improve the biodegradability of the wastewater.Compared to the hydrodechlorination technology driven by Fe0 or H2,EHDC technology is superior in the aspects of(1)mild reaction conditions and controllable process,(2)low chemical input and(3)high reaction selectivity and few yield of toxic by-products.Palladium metal(Pd)has been preferably developed as EHDC catalyst,owing to its robust performance in H* generation,adsorption and activation of C—Cl bonds.This work reviews the research progress achieved in the EHDC field,including the rules to design active catalysts,the insight into the electron transfer path and the interfacial reaction mechanism as well as the strategies to tune the performance of Pd-based catalysts.We also summarize the remaining challenges to the scale application of EHDC technology in practical environmental pollution abatement,and put forward the possible development prospects for this technology.
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