浮游球衣菌对Cu^(2+)的吸附及生物吸附机理初探  

Sorption of Cu^(2+) by Sphaeotilus natans and its biosorption mechanism

作　　者：秦玉春[1] 关晓辉[1] 王海涛[1] 鲁敏[1] 

机构地区：[1]东北电力大学化学工程学院,吉林132012

出　　处：《环境科学学报》2008年第5期892-896,共5页Acta Scientiae Circumstantiae

基　　金：吉林省科技发展计划资助项目(No.20050505);东北电力大学博士科研启动基金资助(No.BSJXM-200705)~~

摘　　要：以浮游球衣菌(Sphaeotilus natans)为生物吸附剂,对废水中Cu2+的吸附规律进行了研究,并采用红外光谱分析法、扫描电子显微镜-X射线能量散射光谱和离子交换实验探讨了Cu2+与浮游球衣菌可能的作用机理.结果表明,pH值是影响菌体吸附Cu2+的主要因素,吸附的最佳pH值为5.5;Cu2+与Ca2+,Na+之间存在着离子交换作用,同时还存在着Cu2+与带负电荷细菌表面的静电吸引作用,—CONH2和—OH是菌体吸附Cu2+的主要活性基团,当溶液pH值较高时,Cu2+能形成氢氧化物微沉淀沉积在细胞表面.To examine the possibility of metal bioaccumulation by Sphaeotilus natans, its ability to absorb Cu^2＋ and its biosorption mechanism were studied. FITR,SEM - EDX and ion exchange were applied to investigate the biosorption of Cu^2＋ by Sphaeotilus natans. The results show that the sorption is mainly influenced by the pH. Sphaeotilus natans adsorbs the most Cu^2＋ at pH 5.5. Ion exchange between Cu^2＋ and cellular Ca^2＋ or Na^＋ occurs on the cell surface and electrostatic attraction may coexist with the sorption process. The principal activated groups on the cell surface were --CONH2 and --OH. Microprecipitation of Cu^2 ＋ may occur on the Sphaeotilus natans cell surface at pH 〉 5.5.

关 键 词：浮游球衣菌(Sphaeotilus natans) CU^2+ 生物吸附 吸附机理 

分 类 号：X703.1[环境科学与工程—环境工程]