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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＋ .
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 ° C) did not affect the biosorption. The biosorptive efficiency (91%) and Biosorptive capacity (Ag + 125 mg · g -1 dry weight biomass) was achieved under the conditions of Ag + 100 mg · L -1, biomass 800 mg · L -1, pH 4.5 and 30 ° C 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 +.