Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (09): 779-782.doi: 10.3866/PKU.WHXB20000904

• Communication • Previous Articles     Next Articles

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

Fu Jin-Zhou, Liu Yue-Ying, Gu Ping-Ying, Shang Ding-Liang, Lin Zhong-Yu, Yao Bing-Xin, Weng Sheng-Zhou   

  1. State Key Laboratory for Physical Chemistry of Solid Surface,Deprtment of Biology,Department of Chemistry Ximen Uuiversity,Xiamen 361005
  • Received:2000-05-23 Revised:2000-06-21 Published:2000-09-15
  • Contact: Fu Jin-Zhou


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+ .

Key words: Lactobcillus, Silver, Biosorption, Bioreduction, Characterization