Kinetics of the electrochemical process of galena electrodes in the diethyldithiocarbamate solution

Li-li Cheng1), Ti-chang Sun1), Xian-ping Luo2), and Dian-zuo Wang3) 1) School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China 3) Chinese Academy of Engineering, Beijing 100038, China

摘 要：The electrochemical process of galena in a pH 12.8 buffer solution was investigated using chronoamperometry and chronopotentiometry. To establish kinetic parameters on the surface of galena in the diethyldithiocarbamate solution, the exchange current density and the dependence of current density on reaction time were determined. Experimental results demonstrate that the exchange current density of galena is 1.585×10?2 A/m2 in the diethyldithiocarbamate-free solution. In the diethyldithiocarbamate solution, the thickness of lead diethyldithiocarbamate adsorbed on the surface of galena is 3.28 molecular layers, the diffusion coefficient of diethyldithiocarbamate on the surface of galena electrodes is 1.13×10?10 m2/s, and the exchange current density of galena is 0.45 A/m2. Lead diethyldithiocarbamate on the surface of galena is firmly adsorbed.

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