硅胶固定的褐藻渣对重金属Cu^(2+)吸附特征研究  

Biosorption of Cu^(2+) by silica-gel-immobilized brown algae residue

作　　者：杨沛珊[1,2] 于艳卿[1,2] 李超峰[1,2] 邹晓兰[1,2] 王新亭[1] 朱校斌[1] 

机构地区：[1]中国科学院海洋研究所,山东青岛266071 [2]中国科学院研究生院,北京100049

出　　处：《海洋科学》2011年第2期44-51,共8页Marine Sciences

基　　金：国家863计划项目(2006AA06Z362)

摘　　要：褐藻渣是褐藻工业产生的固体废弃物,直接排放到环境中容易破坏水体生态平衡。本研究用硅胶固定的褐藻渣吸附重金属Cu2+,并对其吸附特征进行了检测。结果表明,吸附pH、Cu2+初始浓度以及吸附时间对吸附过程均有很大的影响。该吸附材料对初始浓度在2.0 mmol/L以下的Cu2+溶液吸附率可达85%,25℃时最大吸附容量在0.7～0.8 mmol/g之间;其吸附等温线符合Langmuir、Dubimim-Radushkevich方程,基本符合Freundlich方程;吸附动力学过程符合伪二级动力学模型,说明吸附限速步骤是化学吸附过程;实验结果表明硅胶固定的褐藻渣可以用于吸附Cu2+,其成本低廉,选择性好。Algal residues,solid wastes in brown algae industrial production,can destroy ecological balance if they are discharged directly into natural waters.We investigated the biosorption characteristics of Cu2＋ by silica-gel-immobilized algal residues.The experimental data show that pH,initial Cu2＋ concentrations,and contact time have significant impact on biosorption process.The removal of Cu2＋ could reach about 85% when initial Cu2＋ concentration was below 2mmol/L,and the maximum adsorption capacities was around 0.7～0.8mmol/g at 25 °C.We also fit our equilibrium data with Langmuir,Freundlich or Dubinin-Radushkevich isotherm models.Kinetic features of Cu2＋ biosorption were modeled by pseudo first-order and pseudo second-order equations.The results indicate that the silica-gel-immobilized algal residue is low-cost,selective,easily regenerated,and of improved mechanical strength,and can be used for remove heavy metals from wastewater.

关 键 词：生物吸附 褐藻渣 固定化 CU2+ 

分 类 号：X799[环境科学与工程—环境工程]