煤炭生物脱硫的电化学作用机理

Electrochemical Mechanism of Coal Biodesulphurization

讨论了微生物生长的电化行为和特性，描述了生物电化学作用机理及反应模型，对煤炭生物脱硫过程的细菌Zeta电位、铁离子的变化及外控电位下的细菌生长规律进行了实验研究，结果表明：氧化亚铁硫杆菌（T．f．）的Zeta电位在pH=2．0左右时，达到峰值5mV，在此条件下有比较大的活性；细菌生长是通过将Fe^3＋氧化为Fe^3＋过程中获取能量，随着Fe^3＋逐渐被氧化，其浓度相应下降，Fe^3＋浓度缓慢地上升，而溶液中的总铁浓度先下降而后又平缓上升；在-500mV电位下，T．f．菌的生长期缩短，浓度增加5～10倍．

The electrochemistry behavior, bioelectrochemical mechanism and reaction model of thiobacillus ferrooxidans （T. f. ） were described. During coal biodesulphurization, the bacterial Zeta potential, variations of iron ions and bacterial growth under applied potential were investigated. The results show that T.f. keeps more activity when Zeta potential is 5 mV and pH is around 2.0. T.f. acquires energy to grow by the oxidation of Fe^2＋ to Fe^3＋. Fe^2＋ concentration decreases with its gradual oxidation, while the Fe^3＋ concentration slowly rises, and the concentration of total iron ions decreases and then smoothly increases. The growing period of T. f. was shortened, and the concentration of it increased by 5～10 times.