氧化行为的影响
(1. 北京有色金属研究总院, 北京 100088；
2. 中南大学 矿物工程系, 长沙 410083)
摘 要: Fe2+的氧化在细菌浸矿过程中具有重要作用， 细菌浸铜过程中， Cu2+的存在对T.ｆ菌的生长代谢和其氧化Fe2+的能力有一定影响。 制备了T.ｆ菌修饰碳粉粉末微电极, 研究了Cu2+存在下Fe2+在T.f菌修饰粉末微电极上氧化的电化学反应机理，并测定了相应的电极过程动力学参数。 循环伏安研究表明， Cu2+的存在不影响Fe2+在T.f菌修饰粉末微电极上的氧化反应的可逆性。对电极稳态及暂态过程研究表明， 当Cu2+浓度在12mmol/L以下时， Cu2+的存在不会抑制Fe2+在T.f菌修饰粉末微电极上的氧化， 适量Cu2+加强T.f菌氧化Fe2+的作用是在于其加快了电荷传递速率。
关键字: 细菌浸矿; T.f菌修饰粉末微电极; 电化学机理
（1. General Research Institute for Nonferrous Metal, Beijing 100088, China;
2. Department of Mineral Engineering,
Central South University, Changsha 410083, China）
Abstract:The oxidation of Fe2+ plays a very important role in bio-leaching, the exist of Cu2+ has a un-excluded influence on the oxidation of Fe2+ and the growth of thiobacillus ferrooxidans. Using the thiobacillus ferroxidans modified carbon powder microelectrode, the electrochemical mechanism of the influence of Cu2+ on the oxidation of Fe2+ was studied. The Cyclic voltammetry study shows that the presence of Cu2+ can not change the reversibility of Fe2+ oxidation reaction. Steady potentiodynamic and transient stair-step measurement demonstrate that the presence of Cu2+ can not suppress the oxidation of Fe2+ on the thiobacillus ferroxidans modified powder microelectrode. However when the concentration of Cu2+ is under 15mmol/L , it can enhance the mass transfer coefficient and accelerate the charge transfer rate of oxidation reaction
Key words: bio-leaching; thiobacillus ferroxidans modified powder microelectrode; electrochemistry mechanism
