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Studies on Development and Characterization of Amines Modified Bentonite Clay Adsorbent for the Adsorption of Carbon Dioxide

Ibrahim El Khalifah, Ali El Tayeb (2012) Studies on Development and Characterization of Amines Modified Bentonite Clay Adsorbent for the Adsorption of Carbon Dioxide. PhD thesis, Universiti Teknologi PETRONAS.

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Abstract

The aim of the present work is to systematically investigate the use of amine modified bentonite clay for C02 adsorption. For this purpose, different alkali and alkaline earth and transition metal cation forms of bentonite were treated with protonated mono-, di- and triethanolamine compounds to prepare different ammonium-bentonite adsorbents via ion exchange and d coordination complex mechanisms respectively. The structural characteristics, thermal analysis and surface properties of the synthesized materials as well as the raw material were investigated. C02 adsorption studies were gravimetrically conducted using magnetic suspension balance equipment under different temperatures and pressures conditions. The results show that the basal spacings of ammonium-bentonite complexes have increased with the molar mass of ammonium cations used and a monolayer configuration of ammonium cations in the interlayer space of bentonite was obtained. The presence of the common IR peaks of amine compounds has qualitatively supported the intercalation of ammonium cations in the interlayer space of bentonite. The thermal analysis of ammonium-bentonite complexes showed three thermal transition steps which attributed to desorption of the physically adsorbed water and dehydration, decomposition of intercalated ammonium cations and dehydroxylation of the structural water of the clay respectively. It was also found that the molar mass of amine compounds has an inverse effect on the specific surface area of ammonium�bentonite complexes. The presence of carbon, hydrogen and nitrogen in bentonite after treatment with amine compounds has quantitatively confirmed their intercalation into the inter layer space of bentonite. Based on C02 adsorption results, it was found that the C02 adsorption capacities over all studied ammonium-bentonites have increased by approximately 2.5 times in comparison with that of untreated bentonite.

Item Type: Thesis (PhD)
Academic Subject : Academic Department - Chemical Engineering - Process System Engineering
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Ahmad Suhairi Mohamed Lazim
Date Deposited: 16 Sep 2021 12:37
Last Modified: 16 Sep 2021 12:37
URI: http://utpedia.utp.edu.my/id/eprint/21202

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