Guégan Régis, Giovanela Marcelo, Warmont Fabienne, Motelica-Heino Mikael
Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France.
Centro de Ciências Exatas e da Tecnologia, Universidade de Caxias do Sul, 95070-560 Caxias do Sul, RS, Brazil.
J Colloid Interface Sci. 2015 Jan 1;437:71-79. doi: 10.1016/j.jcis.2014.09.043. Epub 2014 Sep 28.
A Na exchanged montmorillonite (Mt) was used as a starting layered material for the preparation of two organoclays synthesized with benzyl decyltrimethyl ammonium (BDTA) cationic surfactant and the tri-ethylene glycol mono n-decyl ether(C10E3), a nonconventional nonionic surfactant. The adsorption of the surfactants was performed at an amount of 0.7 times the cation exchange capacity (CEC) for BDTA and below the critical micelle concentration (cmc) where C10E3 is in a monomer state, leading to the intercalation of a lateral monolayer surfactant arrangement within the interlayer space and about 5-7% organic carbon content in organoclays. The environmental properties of both nonionic (C10E3Mt) and cationic (BDTAMt) organoclays were compared to those of the starting Mt clay with the sorption of three micro-pollutants: benzene, dimethyl-phthalate and paraquat. The adsorption isotherms and the derivative data determined through the fitting procedure by using Langmuir, Freundlich and Dubinin-Radushkevitch equation models explicitly highlighted the importance of the chemical nature of the micropollutants, which play on the adsorbents efficiency. The adsorption data combined with FTIR and XRD supplementary results suggest that C10E3Mt nonionic organoclay, although being less efficient for the retention of the different micropollutants, turned out to be the most polyvalent adsorbent since such hybrid material could adsorb the entire studied organic compounds.
钠交换蒙脱石（Mt）被用作起始层状材料，用于制备两种有机粘土，这两种有机粘土是用苄基癸基三甲基铵（BDTA）阳离子表面活性剂和三乙二醇单正癸醚（C10E3，一种非常规非离子表面活性剂）合成的。表面活性剂的吸附量为BDTA阳离子交换容量（CEC）的0.7倍，且在C10E3处于单体状态的临界胶束浓度（cmc）以下，这导致层间空间内横向单层表面活性剂排列的插层，且有机粘土中的有机碳含量约为5 - 7%。将非离子型（C10E3Mt）和阳离子型（BDTAMt）有机粘土的环境性质与起始Mt粘土对三种微污染物（苯、邻苯二甲酸二甲酯和百草枯）的吸附情况进行了比较。通过使用朗缪尔、弗伦德利希和杜宾宁 - 拉杜什凯维奇方程模型进行拟合程序确定的吸附等温线和导数数据明确突出了微污染物化学性质的重要性，其对吸附剂效率有影响。结合傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）补充结果的吸附数据表明，C10E3Mt非离子有机粘土虽然对不同微污染物的保留效率较低，但却是最具多价吸附能力的吸附剂，因为这种混合材料能够吸附所有研究的有机化合物。
