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细菌吸附还原贵金属离子特性及表征
引用本文:傅锦坤,张伟德,刘月英,林种玉,姚炳新,翁绳周,曾金龙.细菌吸附还原贵金属离子特性及表征[J].高等学校化学学报,1999,20(9):1452-1454.
作者姓名:傅锦坤  张伟德  刘月英  林种玉  姚炳新  翁绳周  曾金龙
作者单位:1. 厦门大学固体表面物理化学国家重点实验室,化学系,厦门,361005
2. 厦门大学固体表面物理化学国家重点实验室,生物系,厦门,361005
基金项目:国家自然科学基金!29876026,2974301,固体表面物理化学国家重点实验室资助
摘    要:提炼、富集贵金属是细菌固定金属的重要用途.部分细菌还可还原金属离子,如海藻、枯草杆菌等均有较强的吸附、还原AU3+等金属离子的能力1~3].本文研究了从生态环境中筛选的几种细菌及其吸附、还原Pd2+、Pt4+、Au3+、Ag+、Rh3+等贵金属离子的特性,以期了解细菌固定金属的作用机制,提高细菌的还原能力,并将所得结果用于回收贵金属和制备高分散度贵金属催化剂.1实验部分D01细菌从生态环境中筛选、培养,并按常规微生物法制备大量菌体.所用仪器为SCR20BC高速冷冻离心机,BairdPS-4电感耦合等离子原子发射光谱仪,740SXFTIR光…

关 键 词:细菌  贵金属  还原

Characterization of Adsorption and Reduction of Noble Metal Ions by Bacteria
FU Jin-kun,ZHNAG Wei-De,LIU Yue-ying,LIN Zhong-yu,YAO Bing-Xin,WENG Sheng-Zhou,ZENG Jin-Long.Characterization of Adsorption and Reduction of Noble Metal Ions by Bacteria[J].Chemical Research In Chinese Universities,1999,20(9):1452-1454.
Authors:FU Jin-kun  ZHNAG Wei-De  LIU Yue-ying  LIN Zhong-yu  YAO Bing-Xin  WENG Sheng-Zhou  ZENG Jin-Long
Abstract:The biomass D01 was screened from the soil of mining area and it was identified as Bacillus megatherium. It is able to adsorb and reduce the noble metal ions such as Pd2+,Au3+ and Ag+ etc. at room temperature. At pH 3. 5, the adsorbed ratio were 93. 2%,99. 5% and 98. 1%, respectively within 2 h. In situ TEM images showed that the Au, Ag particles adsorbed on the cell wall grew up gradually. Some of the Au particles formed polyhedron particles, while some ones broke off from the cell. The particle size can be controlled to be several nano-meters to more than a hundred nano-meters. XPS and XRD results indicated that Au3+, Ag+ and Pd2+ could be reduce to metals much faster than Rh3+ and Pt4+ by Dol. Peaks at 3 087 and 1 664 cm-1 in the IR spectra of D01 reduced gradually while interacting with metal ions, implying that metal ions were coordinated and reduced on the site of acylamide of D01. This is a promising method for preparation of metal catalysts with high dispersion and nano-meter sized metal particles.
Keywords:Bacteria  Noble metal  Reduction
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