鼠李糖脂对沉积物中Cd和Pb的去除作用  

REMOVAL OF HEAVY METALS FROM SEDIMENT BY RHAMNOLIPID

作　　者：时进钢[1] 袁兴中[1] 曾光明[1] 戴芳[1] 傅海燕[1] 

机构地区：[1]湖南大学环境科学与工程系,长沙410082

出　　处：《环境化学》2005年第1期55-58,共4页Environmental Chemistry

基　　金：国家"8 63"高技术资助项目 (No 2 0 0 1AA64 40 2 0 ;2 0 0 3AA64 40 10 ;2 0 0 4AA64 93 70 ) ;国家杰出青年科学基金 ( 5 0 42 5 92 7;5 0 2 2 5 92 6);高等学校博士学科点专项科研基金 ( 2 0 0 2 0 5 3 2 0 17)资助项目

摘　　要：用铜绿假单胞菌 (Pseudomonasaeruginosa )产生的鼠李糖脂生物表面活性剂对沉积物中重金属的去除作用进行了研究 研究表明 ,鼠李糖脂对沉积物中的Cd和Pb有明显的去除作用 ,在鼠李糖脂溶液的 pH值为 10 0的条件下对重金属的去除效率最好 ,而且当鼠李糖脂在沉积物上的吸附达到饱和时去除效率达到最大 通过连续萃取对提取前和提取后沉积物样品中重金属的形态进行分析 ,发现可交换态和有机结合态的重金属较容易去除 通过 4次连续的提取 ,使Cd和Pb的去除效率分别达到 80 1%和 36 5 %The potential of microbially-produced surfactant (rhamnolipid) to remove cadmium and lead from sediment was investigated in this study. The results show that rhamnolipid can remove cadmium and lead from sediment efficiently. The heavy metal removal was best when the pH of rhamnolipid solution was 10.0, and the removal was highest when the sorption of rhamnolipid on the sediment reached a plateau. The speciation of the heavy metals had an effect on the removal efficiency, and exchangeable and organic fractions could be removed efficiently. Four successive washings removed 80.1% cadmium and 36.5% lead.

关 键 词：重金属 去除效率 沉积物 去除作用 交换态 吸附 pH值 糖脂 鼠李糖 铜绿假单胞菌 

分 类 号：X131[环境科学与工程—环境科学]