Interactions of Monovalent Organic Cations with Pillared Clays.
Interactions of Monovalent Organic Cations with Pillared Clays.
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单价有机阳离子与柱状粘土的相互作用。
DOI：
10.1006/jcis.1998.5896
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发表时间：
1999
影响因子：
9.9
通讯作者：
Van Damme H
中科院分区：
文献类型：
--
作者：
Mishael;Rytwo;Nir;Crespín;Annabi;Van Damme H
通过吸附测量和X射线衍射研究了酸活化柱撑粘土与几种有机阳离子包括染料（亚甲蓝，MB;结晶紫，CV;吖啶黄，AF）和苄基衍生物（苄基三甲基铵，BTMA;苄基三乙基铵，BTEA）之间的相互作用。当染料从低离子强度溶液中吸附时，吸附是不可逆的，但在低于粘土的阳离子交换容量（CEC）（0.6 meq/g）的水平下饱和。CV与CEC值的差异最大。这种吸附模式被解释在层间吸附与空间位阻的柱撑画廊。另一方面，当染料从高离子强度溶液中吸附时，可以达到远远超过粘土的CEC的吸附水平，特别是对于MB和CV。这被解释在第二个吸附模式，涉及形成的粘土的外表面上的分子聚集体，如通过X-射线衍射证明。的阳离子苄基衍生物的行为是显着不同的，与吸附水平始终低于CEC和减少吸附的离子强度增加，预期为非络合物形成阳离子。版权所有1999年学术出版社。
Interactions between an acid-activated pillared clay and several organic cations including dyes (methylene blue, MB; crystal violet, CV; acriflavin, AF) and benzyl derivatives (benzyltrimethylammonium, BTMA; benzyltriethylammonium, BTEA) were studied by adsorption measurements and X-ray diffraction. When the dyes were adsorbed from low ionic strength solutions, adsorption was irreversible but saturated at levels below the cation exchange capacity (CEC) of the clay (0.6 meq/g). The difference with CEC value was largest for CV. This mode of adsorption was interpreted in terms of interlayer adsorption with steric hindrance in the pillared galleries. On the other hand, when the dyes were adsorbed from high ionic strength solutions, adsorption levels well beyond the CEC of the clay could be reached, in particular for MB and CV. This was interpreted in terms of a second adsorption mode, involving formation of molecular aggregates on the outer surface of the clay, as evidenced by X-ray diffraction. The behavior of the cationic benzyl derivatives was markedly different, with an adsorption level always below the CEC and a decrease of adsorption as the ionic strength was increased, as expected for non-complex-forming cations. Copyright 1999 Academic Press.