摘要
The dissolution of pyrite was studied with Phanerochaete chrysosporium(P.chrysosporium).This fungus resulted in the dissolution of 18%iron and 33%sulfur.The oxidization layer was formed on the pyrite surface,which probably consisted of iron oxide,iron oxy-hydroxide,iron sulfate,elemental sulfur and mycelia.The electrochemical characteristics of pyrite were studied in the systems without and with P.chrysosporium.P.chrysosporium could accelerate the dissolution of pyrite by decreasing pitting potential and polarization resistance plus improving polarization current,corrosion potential and corrosion current density.The dissolution of pyrite is the combined effect of enzymes,hydrogen peroxide,ferric iron and organic acids.Enzymes attack the chemical bonds by free radicals.Organic acids dissolve pyrite by acidolysis and complexolysis.Enzymes and hydrogen peroxide play an essential role in this process.
研究黄孢原毛平革菌(Phanerochaete chrysosporium)对黄铁矿的溶解。经该菌作用后,黄铁矿中铁和硫的溶解量分别为18%和33%。在黄铁矿表面形成的氧化层可能由铁的氧化物、FeOOH、硫酸铁、元素硫及菌丝体组成。研究黄铁矿在无菌和有菌体系的电化学特征。P.chrysosporium通过降低点蚀电位和极化电阻,提高极化电流、腐蚀电位和腐蚀电流密度的方式促进黄铁矿溶解。Phanerochaete chrysosporium对硫化物的溶解是酶、H_2O_2、Fe^(3+)和有机酸联合作用的结果。酶通过自由基攻击化学键,有机酸通过酸解和络合作用溶解黄铁矿。酶和H_2O_2在黄铁矿溶解过程中发挥了重要作用。
基金
Project(U1608254)supported by the National Natural Science Foundation of China
