Metal solubilization from metal-containing solid materials by cyanogenic Chromobacterium violaceum
Metal solubilization from metal-containing solid materials by cyanogenic Chromobacterium violaceum
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DOI：
10.1016/j.jbiotec.2004.03.031
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发表时间：
2004-09-30
影响因子：
4.1
通讯作者：
Brandl, H
中科院分区：
文献类型：
--
作者：
Faramarzi, MA;Stagars, M;Brandl, H
在氰化物形成条件下，在含金属固体如镍粉或电子废料的存在下，培养不同的生氰细菌菌株（紫色色杆菌、荧光假单胞菌、巨大芽孢杆菌）。所有微生物都能够形成水溶性金属氰化物，然而，具有不同的效率。C. violaceum能够从细粒镍粉中以四氰基镍酸盐[Ni（CN）（4）（2-）]的形式活化镍。从电子废弃物中以二氰金酸盐[Au（CN）（2）（-）]的形式微生物增溶金。此外，氰化物络合铜被检测到在生物处理切碎的印刷电路板废料。关于四氰镍酸盐的形成，C.紫色假单胞菌的抑菌效果优于荧光假单胞菌和B。巨大的除前人报道的C. violaceum，研究结果首次证明了微生物从固体材料中动员除金以外的金属，并代表了一种基于某些微生物形成HCN能力的新型微生物金属动员。结果可能有潜在的工业应用（生物回收，生物修复）关于处理含金属的固体，因为金属氰化物可以很容易地通过色谱手段分离，并通过吸附到活性炭上回收。(C)2004 Elsevier B.V保留所有权利。
Different cyanogenic bacterial strains (Chromobacterium violaceum, Pseudomonas fluorescens, Bacillus megaterium) were cultivated under cyanide-forming conditions in the presence of metal-containing solids such as nickel powder or electronic scrap. All microorganisms were able to form water-soluble metal cyanides, however, with different efficiencies. C. violaceum was able to mobilize nickel as tetracyanonickelate [Ni(CN)(4)(2-)] from fine-grained nickel powder. Gold was microbially solubilized as dicyanaoaurate [Au(CN)(2)(-)] from electronic waste. Additionally, cyanide-complexed copper was detected during biological treatment of shredded printed circuit boards scrap. Regarding the formation of tetracyanonickelate, C. violaceum was more effective than P. fluorescens or B. megaterium. Besides a few previous reports on gold solubilization from gold-containing ores or native gold by C. violaceum, the findings demonstrate for the first time the microbial mobilization of metals other than gold from solid materials and represent a novel type of microbial metal mobilization based on the ability of certain microbes to form HCN. The results might have the potential for industrial applications (biorecovery, bioremediation) regarding the treatment of metal-containing solids since metal cyanides can easily be separated by chromatographic means and be recovered by sorption onto activated carbon. (C) 2004 Elsevier B.V All rights reserved.