Thermal properties of different transition metal forms of montmorillonite intercalated with mono-, di-, and triethanolammonium compounds

Elkhalifah, A.E.I. and Azmi Bustam, M. and Murugesan, T. (2013) Thermal properties of different transition metal forms of montmorillonite intercalated with mono-, di-, and triethanolammonium compounds. Journal of Thermal Analysis and Calorimetry, 112 (2). pp. 929-935. ISSN 13886150

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Abstract

In the present study, different transition metal forms of montmorillonite have been intercalated with mono-, di-, and triethanolammonium cations via d coordination mechanism to investigate their thermal behavior, structural characteristics, surface properties, and elemental composition using TG, XRD, BET, and CHNS techniques. Thermogravimetric analysis showed two thermal transition steps for transition metal-exchanged montmorillonites, which attributed to desorption of the physically adsorbed water and hydrated water, and dehydroxylation of the structural water; whereas for ammonium- montmorillonite complexes, the TG curves showed three thermal transition steps which attributed to desorption of the adsorbed water and dehydration, decomposition of the ammonium cations in the interlayer space of montmorillonite, and the dehydroxylation of the structural water. The thermal analysis of ammonium-montmorillonites affirmed that the molar mass of amine compounds used affects both desorption temperature (position) and the amount of the adsorbed water (intensity). XRD results revealed that the molar mass of amine used has linear relation with the basal spacings of the corresponding ammonium-montmorillonites, indicating structural changes. BET results showed that the molar mass of amines has an inverse effect on the surface area of the studied samples. CHNS analysis for the studied samples quantitatively confirmed the intercalation of ammonium cations into the interlayer space of montmorillonite. © 2012 Akadémiai Kiadó, Budapest, Hungary.

Item Type: Article
Additional Information: cited By 7
Uncontrolled Keywords: Ammonium-montmorillonite; Coordination mechanisms; Desorption temperatures; Elemental compositions; Intercalation process; Structural characteristics; Thermal behaviors; Thermal transitions, Ammonium compounds; Desorption; Positive ions; Thermoanalysis; Thermogravimetric analysis; Transition metals, Clay minerals
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 09 Nov 2023 15:51
Last Modified: 09 Nov 2023 15:51
URI: https://khub.utp.edu.my/scholars/id/eprint/3643

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