施氏矿物吸附Cu^(2+)及氧化亚铁硫杆菌的实验研究  

An experimental study of the adsorption of Cu^(2+) and Acidothiobacillus ferrooxidans on schwertmannite

作　　者：苏贵珍[1,2] 陆建军[1] 陆现彩[1] 李娟[1] 屠博文[3] 

机构地区：[1]内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,江苏南京210093 [2]中国科学院地球化学研究所,贵州贵阳550002 [3]南京大学医学院,江苏南京210093

出　　处：《岩石矿物学杂志》2009年第6期575-580,共6页Acta Petrologica et Mineralogica

基　　金：国家重点基础研究发展计划资助项目(2007CB815603)

摘　　要：在金属硫化物的表生氧化过程中,施氏矿物是最常见的一种次生矿物。施氏矿物具有粒度小、比表面积大、表面吸附能高的特点,能够吸附环境流体中的重金属离子和微生物细胞,从而影响重金属元素及微生物的表生地球化学行为。利用化学合成的施氏矿物,开展了施氏矿物吸附Cu2+及氧化亚铁硫杆菌的实验。结果显示:施氏矿物对金属Cu2+及氧化亚铁硫杆菌均有较强的吸附性;施氏矿物对Cu2+的吸附基本符合Langmuir吸附模型,而对氧化亚铁硫的吸附行为不符合Langmuir模型,可用Freundlich模型描述;施氏矿物的存在对流体中微生物的活动性及其地球化学行为有重要影响,可能会降低氧化菌分解金属硫化物的效率。Schwertmannite,characterized by small particle size,high specific surface area and strong surface adsorption energy,is a common secondary mineral formed during the supergene oxidation of sulfides. Due to its adsorption capacity,it can affect geochemical behaviors of heavy metals and microorganism. This study has focused on the adsorption of Cu^2＋ and Acidothiobacillus ferrooxidans cells on the chemically synthesized schwertmannite. It is observed that the adsorption of Cu^2＋ and Acidothiobacillus ferrooxidans on schwertmannite is remarkable,and the biosorption process of Cu^2＋ is well consistent with the Langmuir model. The biosorption process of Acidothiobacillus ferrooxidans,however,is consistent with the Freundlich model instead of with the Langmuir model. It is deduced that the formation of schwertmannite in the ore-formaing environment can strongly affect geochemical behaviors of heavy metals and microorganism and may also affect the decomposing rate of metal sulfides.

关 键 词：施氏矿物 氧化亚铁硫杆菌 吸附作用 CU2+ 

分 类 号：P578.2[天文地球—矿物学] Q93-3[天文地球—地质学]