Abstract

Organo-mineral derivatives of montmorillonite modified by salts of quaternary ammonium compounds are promising adsorbents for wastewater purification from heavy metal anions, as well as anionic dyes and pesticides. The understanding of the mechanism of anion adsorption by the example of montmorillonite modified by didecyldimethylammonium chloride cationic surfactant is expanded. The high rate of chromium anion adsorption, the appearance of adsorption capacity only during charge exchange of the surface, and the pH dependence of adsorption, including for pH-independent nitrate anions, indicate that a significant contribution to adsorption of anions is made by silanol and aluminol groups on the edge surface of the aluminosilicate layers of the mineral. The redistribution of access to various types of adsorption centers of the surface for adsorptive is the mechanism of inversion of the adsorption properties for montmorillonite. The inner negatively charged surface is screened by the double layer of the surfactant molecules that block the interlayer space. The surfactant molecules are not hydrated, which impedes delamination of the mineral in aqueous medium.

中文翻译：

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阳离子表面活性剂对蒙脱土吸附性能的反演机理

摘要

季铵化合物盐改性的蒙脱土的有机矿物衍生物是用于从重金属阴离子以及阴离子染料和农药中纯化废水的有希望的吸附剂。以二癸基二甲基氯化铵阳离子表面活性剂改性的蒙脱土为例，进一步了解了阴离子的吸附机理。铬阴离子的高吸附速率，仅在表面电荷交换时才具有吸附能力，以及吸附的pH依赖性，包括与pH无关的硝酸根阴离子，表明硅烷醇和三氯甲烷对阴离子的吸附有重要贡献。矿物的硅铝酸盐层边缘表面上的铝硅烷基团。进入表面的各种类型吸附中心进行吸附的重新分布是蒙脱土吸附性能反转的机理。内部带负电的表面被阻挡层间空间的双层表面活性剂分子所屏蔽。表面活性剂分子没有水合，这阻碍了矿物在水性介质中的分层。