污染控制技术及原理
秦玉春,关晓辉,王海涛,鲁敏.浮游球衣菌对Cu2+的吸附及生物吸附机理初探[J].环境科学学报,2008,28(5):892-896
浮游球衣菌对Cu2+的吸附及生物吸附机理初探
- Sorption of Cu2+ by Sphaeotilus natans and its biosorption mechanism
- 基金项目：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)
- 作者
- 单位
- 秦玉春
- 东北电力大学化学工程学院, 吉林 132012
- 关晓辉
- 东北电力大学化学工程学院, 吉林 132012
- 王海涛
- 东北电力大学化学工程学院, 吉林 132012
- 鲁敏
- 东北电力大学化学工程学院, 吉林 132012
- 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.
- Abstract：To examine the possibility of metal bioaccumulation by Sphaeotilus natans,its ability to absorb Cu2+ and its biosorption mechanism were studied.FITR,SEM-EDXand ion exchange were applied to investigate the biosorption of Cu2+ by Sphaeotilus natans.The results show that the sorption is mainly influenced by the pH.Sphaeotilus natans adsorbs the most Cu2+ at pH 5.5.Ion exchange between Cu2+and cellular Ca2+ 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 Cu2+ may occur on the Sphaeotilus natans cell surface at pH >5.5.
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