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).

Abstract:

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-

MSC2000: 

  • O646