胞外聚合物同铁离子交互作用及对微生物分解黄铁矿的影响

his study investigated the interaction of Fe3+ and extracellular polymeric substances (EPS) of Acidithiobacillus ferrooxidans and its effect on microbial decomposition of pyrite under different pH. The electrochemical characteristic of EPS and iron-containing EPS were analyzed by the measurement of Zeta potential and cyclic voltammetry curves. Results showed that both EPS solution were positively charged at lower pH and could be easily attached to the negatively charged surface of pyrite, and iron-containing EPS solution is more conducive to the oxidation reaction of pyrite. Experimental results of the pyrite decomposition indicated that the promoting effect of EPS on the decomposition process of pyrite oxidized by Fe3+ was not obvious at lower pH, whereas the promoting effects was significant at higher pH.