N-十二酰基乙二胺三乙酸钠对黄土吸附Pb、Zn的影响  

Effect of Sodium N-lauroyl Ethylenediamine Triacetate on Loess Soil Adsorption toward Pb and Zn

作　　者：乔洪涛[1] 赵保卫[1] 刁静茹[1] 马锋锋[1] QIAO Hong-tao;ZHAO Bao-wei;DIAO Jing-ru;MA Feng-feng(School of Environmental and Municipal Engineering/Lanzhou Jiaotong University, Lanzhou 730070, China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《山东农业大学学报（自然科学版）》2017年第2期166-170,共5页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：国家自然科学基金:新型螯合型表面活性淋洗修复重金属-有机物复合污染土壤的作用机制(41261077);甘肃省自然科学基金:具有螯合性能的表面活性剂修复重金属-有机物氟化物污染土壤的作用与原理(1010RJZA070)

摘　　要：新型螯合型表面活性剂N-十二酰基乙二胺三乙酸钠盐(LED3A),不仅具备普通表面活性剂的所有性能,而且能与重金属离子形成较高稳定性的螯合物。本文研究了黄土对Pb、Zn的吸附及LED3A对其吸附行为的影响,以期为LED3A洗脱修复重金属污染土壤提供参考。Pb、Zn在黄土上的吸附试验结果表明,黄土对Pb的专性吸附能力大于Zn;Tempkin和Langmuir等温吸附模型能够较好的拟合黄土对Pb、Zn的等温吸附过程;LED3A对黄土吸附Pb、Zn的影响试验结果表明,当LED3A浓度达到5 g·L^(-1)时,其对Pb、Zn吸附量的影响最大,分别使Pb、Zn的吸附量减少2.38和6.38 g·kg^(-1);LED3A单体对Pb的螯合能力大于Zn,而LED3A胶束对Zn的螯合能力强于Pb,LED3A能够有效削弱黄土对Pb、Zn的吸附作用。Novel chelating surfactant,sodium N-lauroyl ethylenediamine triacetate,has all the properties of ordinary surfactants.The chelating surfactant also has the ability to chelate heavy metal ions,forming stable chelating complexes.The batch experiment was conducted to investigate adsorption of Pb and Zn on loess soil and effect of LED3A on their adsorption behavior.In order to provide references for the remediation of heavy metal contaminated soil by LED3A.The results of adsorption of Pb and Zn on loess soil experiment showed that the adsorption capacity of Pb on loess soil was significantly greater than that of Zn.Isothermal adsorption process could be best described by the Tempkin and Langmuir isothermal adsorption models.The effect of LED3A on adsorption of Pb and Zn onto loess soil showed that LED3A could inhibit the adsorption of Pb and Zn on loess soil.When the concentration of LED3A reached5g·L-1,its inhibitory effect on the adsorption capacity of Pb and Zn reached the maximum,2.38and6.38g·kg-1,indicating that the chelating ability of LED3A monomer to Pb was stronger than that of Zn,and the chelating ability of LED3A micelles to Zn was stronger than that of Pb.

关 键 词：N-十二酰基乙二胺三乙酸钠盐 黄土 吸附 Pb、Zn 

分 类 号：X53[环境科学与工程—环境工程]