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(xué) 礦物工程系, 長(zhǎng)沙 410083)
摘 要: Fe2+的氧化在細(xì)菌浸礦過(guò)程中具有重要作用， 細(xì)菌浸銅過(guò)程中， Cu2+的存在對(duì)T.ｆ菌的生長(zhǎng)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(xué)反應(yīng)機(jī)理，并測(cè)定了相應(yīng)的電極過(guò)程動(dòng)力學(xué)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(yīng)的可逆性。對(duì)電極穩(wěn)態(tài)及暫態(tài)過(guò)程研究表明， 當(dāng)Cu2+濃度在12mmol/L以下時(shí)， Cu2+的存在不會(huì)抑制Fe2+在T.f菌修飾粉末微電極上的氧化， 適量Cu2+加強(qiáng)T.f菌氧化Fe2+的作用是在于其加快了電荷傳遞速率。
關(guān)鍵字: 細(xì)菌浸礦; T.f菌修飾粉末微電極; 電化學(xué)機(jī)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
