气单胞菌SH10吸附银离子机制的研究

以气单胞菌SH10为生物吸附材料,从静电吸附作用、离子交换作用、络合作用、沉淀作用几方面研究了SH10吸附Ag 过程可能存在的作用机制.结果表明,气单胞菌SH10吸附银离子依赖于静电吸附作用;吸附Ag 前后溶液中Na 、K 、Mg2 浓度的变化较小,说明吸附过程中离子交换不明显;SH10表面的羧基、氨基和脂类基团经化学屏蔽后,对Ag 的吸附量明显下降,结合红外光谱分析结果,确定酰胺基CO-NH为SH10与银离子发生络合作用的主要官能团;电镜扫描结果表明,SH10在吸附过程中可以和Ag 形成沉淀沉积在细胞表面.

Studies on mechanisms of silver biosorption by Aeromonas SH10

The study on mechanisms of metal biosorption is helpful to improve the biosorption ability of organism. Mechanisms of silver biosorption by Aeromonas SH10 were discussed from several aspects such as electrostatic adsorption, ion exchange, complexation and deposition. Results showed that silver biosorption by SH10 didn't mainly depend on ion exchange duo to only slight increase of the contents of Na~ , K~ , Mg~ 2 in solution after biosorption, while electrostatic adsorption was found to be responsible for biosorption. Adsorptive capacity of silver ion decreased distinctly after functional groups such as carboxyl, amino and lipid groups on SH10 cell wall were chemically modified, respectively. Combined with FTIR spectra, amino groups were confirmed to be the main active groups that could combine with silver ion. SEM illustrated precipitation could take place on the cell wall of SH10.