生物膜细菌藻酸盐对Cu^(2+)的吸附动力学研究  

Kinetic study on Cu^(2+) biosorption by the bacterial alginate extracted from biofilm

作　　者：王琳[1] 张海玲[1] 林跃梅[1] 

机构地区：[1]中国海洋大学环境科学与工程学院,山东青岛266100

出　　处：《环境污染与防治》2009年第10期24-27,共4页Environmental Pollution & Control

基　　金：山东省自然科学基金资助项目(No.Z2007B07);山东省优秀中青年科学家奖励基金资助项目(No.2008BS06013)

摘　　要：以生物膜中提取的细菌藻酸盐为原料制备藻酸钙为吸附剂,对水溶液中的Cu2+进行了吸附动力学研究。试验结果表明,吸附时间、溶液初始pH和吸附剂投加量对藻酸钙吸附Cu2+影响显著。当溶液初始pH为4.0、Cu2+初始质量浓度为100mg/L、吸附剂投加量为0.7g/L时,藻酸钙对Cu2+的平衡吸附量为56.15mg/g。水溶液中Cu2+在藻酸钙上的吸附动力学过程可用准二级动力学方程来模拟。吸附等温线研究表明,藻酸钙吸附Cu2+的过程可用Langmuir和Freundlich模型来描述。100mmol/L乙二胺四乙酸(EDTA)可有效解吸95.6%的Cu2+,实现Cu2+的回收与吸附剂的重复利用。The biosorbent Ca-alginate was prepared with bacterial alginate extracted from biofilm as raw material. The obtained Ca-alginate was employed for the biosorption of copper, the effect of contacting time, initial pH and alginate dosage on Cu2＋ biosorption capacity were investigated. Keeping the initial Cu2＋ concentration of 100 mg/L, Ca-sludge alginate dosage of 0.7 g/L,the best Cu2＋ adsorption capacity （56.15 mg/g） was found at pH of 4.0. The biosorption process would be well described by pseudo second-order equation. The maximum adsorption capacities was found to be 66.23 mg/g by Langmuir adsorption isotherm,and the chemical reaction might exist in adsorption process because of the high fitting precision of Freundlich adsorption isotherm. Given the EDTA of 100 mmol/L,95.6% Cu2＋ could be desorbted, so that the Cu2＋ recovery and bio-adsorbent regenerated could be realized.

关 键 词：CU2+ 细菌藻酸盐 生物吸附 生物膜 

分 类 号：X703[环境科学与工程—环境工程]