N-LED3A的Zeta电位及洗脱Pb、Zn污染土壤的效果  

Zeta Potential of New Chelating Surfactant and Its Effect on Washing Heavy Metals

作　　者：乔洪涛[1] 赵保卫[1] 刁静茹[1] 马锋锋[1] 

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：《兰州交通大学学报》2017年第1期130-135,共6页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(41261077);甘肃省自然科学基金(1010RJZA070)

摘　　要：螯合型表面活性剂胶束对重金属的螯合作用是其洗脱污染土壤中重金属的主要机制,而Zeta电位是表征胶束稳定性的重要指标之一.因此,选用螯合型表面活性剂N-十二酰基乙二胺三乙酸钠盐(N-LED3A),考察了NLED3A的Zeta电位及洗脱Pb、Zn污染土壤的效果.结果表明:当N-LED3A的Zeta电位绝对值大于66mV时,NLED3A胶束的稳定性较高,其对重金属Pb、Zn的洗脱效果最佳,最佳洗脱浓度为7 000mg·L-1,pH值为9;K+和Na+对洗脱有抑制作用.The main mechanism of chelating surfactant to wash heavy metal contaminated soil is its micelles chelating heavy metal ions.Zeta potential is one of the important indexes to characterize the stability of colloidal dispersion system.The batch experiment was conducted to investigate Zeta potential and washing effect of chelating surfactant,sodium N-lauroyl ethylenediamine triacetate （N-LED3A） on Pb and Zn contaminated soils.Zeta potentials and washing experiments of N-LED3A under different conditions showed that N-LED3A had higher micelle stability and the best washing effect on heavy metals Pb and Zn when Zeta potential of N-LED3A was higher than 66 mV.Both K^＋ and Na^＋ had inhibitory effect on washing Pb and Zn by N-LED3A.

关 键 词：新型螯合型表面活性剂 ZETA电位 洗脱作用 重金属 

分 类 号：X53[环境科学与工程—环境工程]