Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (05): 973-980.doi: 10.3866/PKU.WHXB201302283

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Dechlorination of Benzenyltrichloride in CH3CN Solvent at a Silver Cathode

XU Ying-Hua, MA Hong-Xing, CAI Qian-Qian, ZHU Ying-Hong, MA Chun-An   

  1. State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou 310032, Zhejiang Province, P. R. China
  • Received:2013-01-11 Revised:2013-02-27 Published:2013-04-24
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21106133) and National Key Basic Research Program of China (973) (2012CB722604).


The reductive dechlorination mechanism of benzenyltrichloride at an Ag cathode was investigated using cyclic voltammetry (CV) and potentiostatic electrolysis, in CH3CN solvent containing 0.1 mol·L- tetrabutylammonium perchlorate (TBAP). The adsorption of Cl- generated during dechlorination was detected using wide anode region CV, based on its anodic reaction with Ag. The CV results indicated that: (1) Ag exhibited better electrocatalytic activity than Hg for the dechlorination; (2) the first reduction peak, which was divided from the reduction peak of benzenyltrichloride at -1.19 V (vs Ag/Ag+) when the scan rate was ≤50 mV·s-1, is an adsorption controlled process and its electron transfer occurred in a concerted way, and the electron transfer coefficient is approximately 0.25; (3) the potential region where departing Cladsorbed on Ag ranged from -0.75 to -1.75 V (vs Ag/Ag+ ). The electrolysis results indicated that dechlorination product selectivity was strongly dependent on the Ag electrode potential.

Key words: Ag electrode, Reductive dechlorination, Dechlorination mechanism, Wide anode region CV, Adsorption of Cl-


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