Electrochemical kinetics of gold dissolving in alkaline thiourea solution  

作　　者：柴立元 王云燕 

机构地区：[1]School of Metallurgical Science and Engineering, Central South University

出　　处：《Journal of Central South University of Technology》2006年第5期477-480,共4页中南工业大学学报（英文版）

基　　金：Project(50004009) supported by the National Natural Science Foundation of China

摘　　要：Kinetic parameters of the electrode reactions were measured by investigating steady-state current-potential behaviors. The results show that the apparent transfer coefficient of anodic process is 0.0582, diffusion coefficient of thiourea gold complex is 6.04×10~ -6 cm^2/s,anodic reaction order of thiourea is 2.0183, and anodic reaction order of OH^- is 0.0166. The theoretical kinetics equation of gold dissolving in alkaline thiourea solution is deduced, which indicates that anodic reaction order of thiourea is 2, and anodic reaction order of OH^- is 0. The theoretical values of the kinetic parameters are consistent with experimental values very well. The correctness of the mechanism is further demonstrated using apparent transfer coefficient according to the electrochemical dynamic equation of multi-electron reaction.Kinetic parameters of the electrode reactions were measured by investigating steady-state current-potential behaviors. The results show that the apparent transfer coefficient of anodic process is 0. 058 2, diffusion coefficient of thiourea gold complex is 6.04 × 10^-6 cm^2/s,anodic reaction order of thiourea is 2. 018 3, and anodic reaction order of OH^- is 0. 016 6. The theoretical kinetics equation of gold dissolving in alkaline thiourea solution is deduced, which indicates that anodic reaction order of thiourea is 2, and anodic reaction order of OH^- is 0. The theoretical values of the kinetic parameters are consistent with experimental values very well. The correctness of the mechanism is further demonstrated using apparent transfer coefficient according to the electrochemical dynamic equation of multi-electron reaction.

关 键 词：GOLD alkaline thiourea electrochemical kinetics 

分 类 号：TF831[冶金工程—有色金属冶金]