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贵金属离子非酶法生物还原机理初探
引用本文:林种玉,傅锦坤,吴剑鸣,刘月英,程琥.贵金属离子非酶法生物还原机理初探[J].物理化学学报,2001,17(5):477-480.
作者姓名:林种玉  傅锦坤  吴剑鸣  刘月英  程琥
作者单位:State Key Laboratory for Physical Chemistry of Solid Surface,Department of Chemistry,Department of Biology,Xiamen University,Xiamen 361005
基金项目:国家自然科学基金资助项目(29876026,29743001)
摘    要:在微生物湿法冶金回收贵金属的研究工作中,掌握金属非酶法生物还原的作用过程及本质是优化浸出工艺条件,设计高效,经济的生物加收技术的关键,因此有关细菌固定金属的作用机制的研究一直为人们所关注,冻干的海藻(Chlorella vulgaris)和四氯金(Ⅲ)酸盐AuCl4]-相互作用,Au3+快速被还原为Au ,继而缓慢地被还原成Au1],厌氧的脱硫弧菌属(Desulfovibrio desulfuricans)的休止细胞能将溶液中的钯离子还原为金属钯,用丙酮酸钠,甲酸钠或氢气作为电子供体2],我们试图从失活细菌与金属离子的界面出发,利用谱学技术,考察细菌与金属离子之间的相互作用本质,为开发利用生物体作为吸附剂进行废水处理,回收贵重或有害金属以及制备高分散度负载型金属催化剂3]提供理论依据。

关 键 词:巨大芽孢杆菌  贵金属  生物吸附  非酶法生物还原  FTIR  
收稿时间:2000-10-24
修稿时间:2000年10月24

Preliminary Study on the Mechanism of Non- enzymatic Bioreduction of Precious Metal Ions
LIN Zhong-yu,FU Jin-kun,Wu Jian-Ming,LIU Yue-ying,CHENG Hu.Preliminary Study on the Mechanism of Non- enzymatic Bioreduction of Precious Metal Ions[J].Acta Physico-Chimica Sinica,2001,17(5):477-480.
Authors:LIN Zhong-yu  FU Jin-kun  Wu Jian-Ming  LIU Yue-ying  CHENG Hu
Institution:State Key Laboratory for Physical Chemistry of Solid Surface,Department of Chemistry,Department of Biology,Xiamen University,Xiamen 361005
Abstract:Preliminary study on the mechanism of non-enzymatic bioreduction of gold,silver,platinum,palladium and rhodium ions by Bacillus megatherium D01 biomass has been carried out by means of TEM,XRD,XPS and FTIR methods. The results showed that after contacted with D01 biomass,Au3+ has been completely reduced to elemental,cell bound Au0 for 2h and about 45% Rh3+ to Rh0 for 2 d at 30℃ and pH 3.5 without biochemical or chemical cofactors; the cardinal mechanism of D01 cell accumulating metal ions was biosorption,and the primary location where biosorption occurred was the D01 cell wall; active groups such as carbonyl of amido bond and carboxyl on the cell wall may complex or chelate with the precious metal ions; and aldose and ketose,i.e.,hydrolysate of part polysaccharide on the cell wall in acidic medium,served as the election donor,and reduced soluble precious metal ions to atoms.
Keywords:Bacillus megatherium  Precious metal  Biosorpton  Non-enzymatic bioreduction  FTIR
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