小球藻对海水中Pb^(2+)的生物吸附研究  

Biosorption of Pb^(2+) in Seawater by Chlorella Pyrenoidosa

作　　者：寇希元[1] 张晓青[1] 张爱君[1] 张雨山[1] 王静[1] 

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192

出　　处：《化学工业与工程》2011年第2期40-44,共5页Chemical Industry and Engineering

基　　金：中央级公益性科研院所专项资金项目(K-JBYWF-2009-T04);国家"十一五"科技支撑计划课题资助项目(2006BAB03A08)

摘　　要：研究了小球藻对海水中Pb2+吸附的特性,探讨了吸附热力学和动力学。考察了吸附剂用量、pH值、温度、Pb2+的起始浓度和时间等对吸附的影响。研究表明,在试验浓度范围内,吸附剂的用量对吸附率的影响不大;pH值对吸附影响较大,小球藻吸附Pb2+的适宜pH值为4～6;小球藻对Pb2+吸附的吸附量与其浓度呈正相关;在25℃时,小球藻对Pb2+的吸附非常快,60 min达到吸附平衡,其动力学数据符合准二级动力学模型,对Pb2+的吸附可以用Freundlich等温方程来描述,对含铅污染的海水净化处理具有探索性及指导性意义。The process of biosorption of Pb^2＋ by chlorella pyrenoidosa,its adsorption thermodynamics and adsorption kinetics were investigated in this paper.The effects of biomass concentration,pH value,temperature,initial Pb^2＋ concentration and adsorption time on biosorption were studied respectively.Result showed that the adsorption rate did not fluctuate remarkably when the biomass concentration varied at the range of 0.5 g /L to 4 g /L.The biosorption was significantly affected by initial solution pH and the optimal pH value of biosorption of Pb^2＋ by chlorella pyrenoidosa was 4—6.On the other hand,the adsorption quantity of Pb^2＋ by chlorella pyrenoidosa was positively correlated with the initial concentration of Pb^2＋.Kinetic studies revealed that the biosorption was rapid,the absorption reached its equilibrium within 60 min at 25 ℃.These experimental results could be accurately described by second order kinetic model.The Freundlich model fitted the experimental data quite well.This can give references to purification process of seawater contained lead.

关 键 词：生物吸附 小球藻 动力学 PB2+ 

分 类 号：X703[环境科学与工程—环境工程]