Effect of Acidity in Montmorillonite Interlayers on the Sorption of Aniline Derivatives

Abstract

Abstract-Sorption of aniline and its derivatives by montmorillonite substituted by cations of widely different acidity depends upon the polarizing power of the interlayer cations. Infra-red spectra indicate that the anilines are mostly bound to the interlayer cations through water molecules, except in Cs montmorillonite, where bonding to the oxygen surfaces of the alumino-silicate sheets seems to predominate. Anilines are weak bases, which compete with the oxygen surfaces for protons of acidic interlayer water. Consequently, the tendency of anilines to act as proton donors in the clay interlayers increases with the polarizing power of the exchangeable cation. The concept of 'basic' water is introduced to account for some of the features of the spectra ofCs montmorillonite treated with the organic ligands.

Adsorption of Dimethylanilines on Montmorillonite in High-Pressure Liquid Chromatography

“…Dimethyl-substituted anilines may serve as model compounds for the study of the interactions of aniline and its derivatives, in particular pesticides and their decomposition products, with clays (Theng, 1974). In a less direct way they are also models for various compounds containing amino groups, because the amino groups displays a strong affinity with clays (see e.g., Yariv et al, 1969) and may dominate the interaction of many molecules which contain an amino group with clays. In the present study HPLC columns of SP-bentonite were used to gain insight into the interaction of the dimethylanilines with bentonite.…”

“…H H Yariv et aL (1969) claimed that both interactions may take place. If the adsorption is indeed through the hydration shell of the exchangeable cations, the increase in the retention time with the basicity of the ring-substituted dimethylanilines suggests the predominance of interaction (I) in the adsorption of dimethylanilines.…”

An Ultraviolet Spectroscopic Method for Monitoring Surface Acidity of Clay Minerals under Varying Water Content

“…Surface acidity is inherently related to spontaneous chemical change within and on the edges of the clay lattice (Paver and Marshall, 1934;Kerr et al, 1955), and plays a governing role in the chemical and physical behavior of many surface-adsorbed molecules (McAuliffe and Coleman, 1955;Dodd and Satyabrata, 1960;Fripiat et al, 1964;Swoboda and Kunze, 1964;Russell, 1965;Serratosa, 1966;Farmer and Mortland, 1966;Talhoun and Mortland, 1966;Mortland, 1968 ;Harter and Ahlrichs, 1969;Yariv et al, 1969).…”

Chromate adsorption on acid-treated and amines-modified clay

“…It was believed that aniline species vertically placed in the interlayer of montmorillonite and tied to Na ? via water molecule (Yariv et al 1969). Fixed aniline gave rise to the IR bands at 2,900, 2,593, 1,493 cm -1 (Fig.…”

“…However, as negatively polarized minerals, they cannot fix hazardous anionic chemical species, such as chromate, nitrate, arsenate, etc. Retention of anions and improvement of adsorption of cationic pollutants in aqueous solutions using clays were possible by adopting appropriate chemical modifications of clays (acid activation, intercalation, treatment with organic compounds) (e.g., Bergaya and Lagaly 2001;Yariv and Cross 2001;Komadel and Madejová 2006;Lagaly et al 2006;Lee and Tiwari 2012).…”