黑藻对铅离子的生物吸附  

Adsorption of Pb^(2+)in Water onto Hydrilla Verticillata

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：《化工环保》2008年第4期288-291,共4页Environmental Protection of Chemical Industry

基　　金：国家高技术研究发展计划(863计划)(2004AA649370);国家重点基础研究发展计划(973计划)(2005CB724203);国家杰出青年科学基金资助项目(50225926,50425927)

摘　　要：研究了黑藻对 Pb^(2+)的生物吸附作用,考察了溶液 pH、Pb^(2+)初始质量浓度、黑藻加入量和吸附时间对吸附效果的影响。实验结果表明,溶液 pH 在2.5～5.0时吸附效果最好,吸附20 min 基本达到平衡。在溶液 pH 为4.0、黑藻加入量为2 g/L、吸附时间为60 min、Pb^(2+)初始质量浓度为100 mg/L 的条件下,黑藻对 Pb^(2+)的吸附量为47.5 mg/g。通过元素分析和等温吸附模型对黑藻吸附 Pb^(2+)的机理进行了研究,发现黑藻吸附 Pb^(2+)是阳离子交换过程,吸附符合 Langmuir、Freundlich 和 D-R 等温吸附模型。考察了 Cd^(2+)、Cu^(2+)和 Ni^(2+)对黑藻吸附 Pb^(2+)的影响,结果表明,Cd^(2+)、Cu^(2+)和 Ni^(2+)的存在不干扰黑藻对 Pb^(2+)的吸附。The adsorption of Pb^2＋ onto Hydrilla verticillata was studied. The effects of solution pH, Pb〉 initial concentration, Hydrilla verticiUata dosage and contact time on the adsorption were investigated. The results show that the adsorption effect is the best when the solution pH is 2.5 - 5.0, and the adsorption can attain balance after 20 min. Under the conditions of pH 4. 0, Hydrilla verticillata dosage 2 g/L, adsorption time 60 min, and Pb^2＋ initial concentration 100 mg/L, the adsorption capacity is 47.5 mg/g. The element analysis and the isothermal adsorption model study indicate that the adsorption mechanism is cation exchange, and the adsorption accords with Langmuir, Freundlich and D-R isothermal adsorption models. The effects of Cd^2＋, Cu^2＋ and Ni^2＋ on the adsorption of Pb^2＋ onto Hydrilla verticillata were studied, too. It shows that the existence of Cd^2＋ , Cu^2＋and Ni〉 has no effects on the adsorption.

关 键 词：黑藻 铅离子 生物吸附 等温吸附模型 

分 类 号：X703.1[环境科学与工程—环境工程]