高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (2): 372.doi: 10.7503/cjcu20130578

• 物理化学 • 上一篇    下一篇

氧化亚铁硫杆菌的胞外电子传递研究

梁方圆1, 吴冉冉1, 曹昌丽1, 郑越1,2, 杨朝晖2, 赵峰1()   

  1. 1. 中国科学院城市环境研究所, 厦门 361021
    2. 湖南大学环境科学与工程学院, 长沙 410082
  • 收稿日期:2013-06-24 出版日期:2014-02-10 发布日期:2013-10-23
  • 作者简介:联系人简介: 赵 峰, 男, 博士, 研究员, 博士生导师, 主要从事生物电化学系统研究. E-mail: fzhao@iue.ac.cn
  • 基金资助:
    中国科学院知识创新工程重要方向项目(批准号: KZCX2-EW-402)、 中国科学院百人计划和国家自然科学基金(批准号: 21177122)资助

Research on Extracellular Electron Transfer of Acidithiobacillus Ferrooxidans

LIANG Fangyuan1, WU Ranran1, CAO Changli1, ZHENG Yue1,2, YANG Zhaohui2, ZHAO Feng1,*()   

  1. 1. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
    2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
  • Received:2013-06-24 Online:2014-02-10 Published:2013-10-23
  • Contact: ZHAO Feng E-mail:fzhao@iue.ac.cn
  • Supported by:
    † Supported by the Main Direction Program of Knowledge Innovation(No;KICX2-EW-402), the Hundred Talents Program of CAS and the National Natural Science Foundation of China(No.21177122)

摘要:

使用循环伏安、 计时电流等电化学方法研究了氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans, At. f)的胞外电子传递机理. 通过比较分别以亚铁离子和单质硫为电子供体培养的At. f的循环伏安曲线的还原峰可知, At. f具有胞外电子传递能力; 恒压-0.4 V时, 加入亚铁离子能够促进At. f的胞外电子传递; 好氧条件比厌氧条件产生/变化的电流大1个数量级, 说明At. f在好氧条件下具有较强的电化学活性. 此外, 采用X射线衍射、 傅里叶变换红外光谱及扫描电子显微镜等对菌体的表面特征进行了分析.

关键词: 氧化亚铁硫杆菌, 电子传递, 浸矿, 循环伏安, 计时电流

Abstract:

Extracellular electron transfer of Acidithiobacillus ferrooxidans(At. f) was investigated using cyclic voltammetry and chronoamperometry. Compared with cyclic voltammograms with ferrous ion or sulfur as electron donors, At. f has the extracellular electron transfer capability, and the reduction peak is produced by At. f under the condition of a constant potential -0.4 V, adding ferrous ion to the system could improve extracellular electron transfer. The current produced/changed under aerobic condition is more than one order of magnitude than under anaerobic condition. It illustrates that At. f has the stronger electrochemical activity under aerobic condition. In addition, surface characteristics of At. f were analyzed using X-ray diffraction, Fourier transform infrared spectra and scanning electron microscopy. These results could provide a basis for improving metal leaching rate.

Key words: Acidithiobacillus ferrooxidan, Electron transfer, Bioleaching, Cyclic voltammetry, Chronoam-perometry

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