黑藻对镉离子的生物吸附研究  

STUDY ON BIOSORPTION OF HYDRILLA VERTICILLATA FOR Cd^(2+)

作　　者：黄灵芝[1,2] 曾光明[1] 黄国和[1] 李丽峰[2] 

机构地区：[1]湖南大学环境科学与工程学院,湖南长沙410082 [2]长沙理工大学化学与环境工程学院,湖南长沙410077

出　　处：《水处理技术》2009年第2期62-64,共3页Technology of Water Treatment

基　　金：国家研究发展计划(863)项目(2004AA649370);国家重点基础研究发展计划(973)项目(2005CB724203);国家杰出青年科学基金(50225926,50425927);湖南省教育厅资助项目(08C113)

摘　　要：研究了黑藻对镉离子的吸附作用,考察了溶液pH、镉离子初始浓度、吸附剂用量和吸附时间等因素对吸附的影响。在选定的吸附条件下,即pH为6.0,吸附剂用量为2g·L-1,吸附时间为120min时,对于50mg·L-1的Cd2+溶液,黑藻对Cd2+的吸附效率为96%,吸附量为24.1mg·g-1。常温下黑藻对Cd2+的吸附作用可用Langmiur、Freundlich和Dubinin-Radushkevich(D-R)等温吸附模型进行拟合,相关系数r2分别达到0.9852、0.9901和0.9982,说明吸附反应符合这三种吸附模型。The biosorption of Hydrilla Verticillata for Cd^2＋was studied.Thee ffect of pH, initial concentration,biosorbent dosage and contact time was studied in batch experiment. Under the selected conditions, pH being 6.0, biosorbent dosage being 2 g.L^-1 and adsorption time being 120 min, the removal rates to Cd^2＋ was 96% and the adsorption capacity was 24.1 mg·g^-1. Sorption isotherms were studied to explain the removal mechanism by fitting isotherms data into Langmiur,Freundlich and D-R equation. The r^2 respectively achieves 0.9852, 0.9901 and 0.9982 at 25℃

关 键 词：黑藻 Cd2+ 生物吸附 等温吸附模型 

分 类 号：TQ424[化学工程]