氧化行為的影響
(1. 北京有色金屬研究總院, 北京 100088;
2. 中南大學 礦物工程系, 長沙 410083)
摘 要: Fe2+的氧化在細菌浸礦過程中具有重要作用, 細菌浸銅過程中, Cu2+的存在對T.f菌的生長代謝和其氧化Fe2+的能力有一定影響。 制備了T.f菌修飾碳粉粉末微電極, 研究了Cu2+存在下Fe2+在T.f菌修飾粉末微電極上氧化的電化學反應機理,并測定了相應的電極過程動力學參數(shù)。 循環(huán)伏安研究表明, Cu2+的存在不影響Fe2+在T.f菌修飾粉末微電極上的氧化反應的可逆性。對電極穩(wěn)態(tài)及暫態(tài)過程研究表明, 當Cu2+濃度在12mmol/L以下時, Cu2+的存在不會抑制Fe2+在T.f菌修飾粉末微電極上的氧化, 適量Cu2+加強T.f菌氧化Fe2+的作用是在于其加快了電荷傳遞速率。
關鍵字: 細菌浸礦; T.f菌修飾粉末微電極; 電化學機理
WANG Dian-zuo1, 2, RUAN Ren-man1
(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


