海黍子吸附重金属镉离子的研究  

Investigation of Cadmium (Ⅱ) Biosorption on Sargassum kjellmanum

作　　者：常秀莲[1] 王文华[1] 冯咏梅[1] 郑舒文[1] 

机构地区：[1]山东烟台大学化学生物理工学院,山东烟台264005

出　　处：《海洋通报》2003年第4期26-31,共6页Marine Science Bulletin

基　　金：山东省教育厅项目(J01C12)资助

摘　　要：采用廉价的多细胞褐藻海黍子对重金属镉离子进行吸附，研究海黍子不同的预处理方法、溶液的pH 值、初始 Cd2+ 浓度、外加盐等因素对 Cd2+ 的吸附特性的影响，并对吸附机理进行了初步的探讨，发现镉离子与海黍子中的钙离子发生离子交换作用，交换率占总吸附量的 38 %～50 %。适宜的 pH 范围为 3～6，海黍子的最大吸附量高达 181 mg/g，得出了适宜的吸附等温线方程，并进行了简单的洗脱研究。:Sargassum kjellmanum as a biosorbent is investigated under the following experimental conditions: pretreatment, pH, initial cadmium concentration and some common ions. Cadmium adsorption has a wide range of proper pH of 3～6. Various foreign cations have different effects on cadmium adsorption. The maximum cadmium uptake is 181 mg/g higher than that in other reported documents using Sargassum as biosorbent. Results demonstrate the existence of ion exchange between Ca2+ in Sargassum kjellmanum and Cd2+ in solution and the uptake ratio produced by ion exchange between Ca2+ and Cd2+ is about 38 %～50 % of the total Cd2+ uptake. Freundlich equation has modeled the adsorption processes well. A preliminary elution has been carried out.

关 键 词：海黍子 预处理 吸附等温线 镉离子 洗脱 重金属 

分 类 号：X703[环境科学与工程—环境工程]