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标题：ADSORPTION MECHANISM OF A NOVEL CHELATING SURFACTANT BY SOILS: INFLUENCE OF THE SOIL FRACTIONS
本地全文：下载
作者：Jingru Diao ; Baowei Zhao ; Fengfeng Ma 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2020
卷号：29
期号：1
页码：231-238
语种：English
出版社：PSP Publishing
摘要：Adsorption kinetics and isotherms of a novel chelating surfactant sodium V-lauroyl ethylenedia- mine triacetate (LED3A), onto two types of soils (Sa1 and Sb1) and their respective organic-matter-extracted samples (Sa2 and Sb2) were investigated to get better understanding on characteristics of the LED3A adsorption onto soil minerals and organic matters. The experiments were conducted in batches. The pseudo-second-order kinetic mode provided the most accurate representation for adsorption of LED3A onto Sa1 and Sb1. The isotherms of adsorption onto the soil samples were found reasonably fitted to the Langmuir equation. The maximum adsorption capacity (qm) was in the sequence of Sb2>Sa2>Sb1>Sa1. The greater adsorption by H2O2- treated soils than untreated soils indicates that the soil minerals, especially the mineral types and content, might dominate the adsorption of LED3A, whereas the soil organic matters would play an minor role in the surfactant adsorption. The adsorption mechanisms were further confirmed by X-ray diffraction (XRD) patterns of the soil samples. The formation of hemimicelle via chelation between LED3A and clay minerals is probable the primary mechanism of LED3A adsorption, which resulted in cooperative adsorption and the exponential increase of adsorption amount as LED3A equilibrium concentration increased above its CMC. The results will provide meaningful information about the behavior and mechanism of LED3A adsorption so as to apply LED3A to remediate soils contaminated by both organics and heavy metals.
关键词：Chelating surfactant;adsorption;clay mineral;soil organic matter