细菌还原Au--(3+)制备金催化剂的研究

从不同来源的细菌菌株筛选获得一株吸附还原Au3＋较强的菌株d01，经鉴定为巨大芽孢杆菌（bACIluSMEgATHErIuM）d01。菌株d01在Au3＋浓度600Mg/l下仍能较好生长。从电化学反应表明，该菌具有较强的还原力，它能将金催化剂的前驱体Au3＋/αfE2O3还原成具有催化CO＋O2→CO2的高分散度的Au0/αfE2O3催化剂国家自然科学基金;固体表面物理化学国家重点实验室资

Study on the Reduction of Supported Noble Metal Ions Using Bacteria

负载型贵金属离子细菌还原的探索研究傅锦坤于新生林种玉胡荣宗（固体表面物理化学国家重点实验室厦门大学化学系厦门361005）刘月英姚炳新翁绳周（厦门大学生物学系厦门361005）生物化学法制备高分散度贵金属（rH、PT、Pd、Ag、Au）催化剂的研究中...The Gram positive bacteria strain D01 selected From various samples, are possessed of the stronger reducing ability. Its culture was easy. Supported Rh 3+ , Pt 4+ , Pd 2+ , A + g, Au 3+ could be adsorbed and reduced by this bacteria.The results obtained by IR techniques shown that there was the biochemistry action between the bacteria and the noble metal ions. Using the cyclic voltammograph method indicated that the reducing ability of the bacteria were stronger. XPS experiments Further indicated above noble ions could be reduced by this bacteria with diFFerent degree, the reduction did not be inFluenced by the kinds of noble metal ions and supports. The results shown that the properties of redox of above noble metal ions For electron transFer were the same. The preparation of Au catalyst with high dispersion ( Au 0 For nanometer particles ) on (Fe 2O 3)was also studied.国家自然科学基金（风险基金）;固体表面物理化学国家重点实验室基

Characterization of Adsorption and Reduction of Noble Metal Ions by Bacteria

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.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

Spectroscopic Characterization on the Biosorption and Bioreduction of Ag(Ⅰ ) by Lactobacillus sp. A09

Some characteristics of Ag＋ biosorption and bioreduction by Lactobacillus sp. A09 biomass were reported. The optimum pH value of Ag＋ biosorption by strain A09 was 4.5. Temperature(6～ 50 ℃ ) did not affect the biosorption. The biosorptive efficiency (91％ ) and biosorptive capacity(Ag＋ 125 mg· g－ 1 dry weight biomass ) were achieved under the conditions of Ag＋ 100 mg· L－ 1, biomass 800 mg· L－ 1, pH 4.5 and 30 ℃ for 24 h contact. TEM analysis indicated that A09 biomass could reduce Ag＋ to Ag0 as Ag particles on the surface of cells. IR spectroscopy showed that － CO2－ and － HN－ C=O on the surface of cells may involve in the precession for adsorbing Ag＋ .国家自然科学基金!(29743001和29876026

Preparation of Highly Dispersive Supported Gold Catalyst by Microbial Reduction Method

After widely screening, a kind of bacteria was obtamed, which is casy to culture and hasstrong ability of reducing Au3+ to Au0.It was used to prepare the highly dispersive Au/a-Fe2O3catalyst by in situ reducmg the Au3+ ions impregnated on a-Fe2O3 supporter to Au0 particles.with a mean size of 5 nm, under the condition of 28℃ and pH 4.5.The reductive degree ofAu3+ was up to 100%.This catalyst showed good catalytic property for the oxidation of carbonmonoxide, the percent conversion of 1.5% CO, balanced withe air was up to 100% under thecondition of 25--28℃and GHSV 500mL·h-1·g-1, and the percent conversion of 100% lastedfor 75 h at 25 ℃.国家自然科学基金;固体表面物理化学国家重点实验室基

Spectroscopic characterization on the biosorption and bioreduction of Ag(I) by Lactobacillus sp. A09

Some characteristics of Ag+ biosorption and bioreduction by Lactobacillus sp. A09 biomass were reported. The optimum pH value of Ag+ biosorption by strain A09 was 4.5. Temperature(6 similar to 50 degrees C) did not affect the biosorption. The biosorptive efficiency (91%) and biosorptive capacity(Ag(+)125 mg . g(-1) dry weight biomass) were achieved under the conditions of Ag(+)100 mg . L-1, biomass 800 mg . L-1, pH 4.5 and 30 degrees C for 24 h contact, TEM analysis indicated that A09 biomass could reduce Ag+ to Ag-o as Ag particles on the surface of cells. IR spectroscopy showed that -CO2- and -HN -C = O on the surface of cells may involve in the precession for adsorbing Ag+