Carbon Dioxide Retention on Bentonite Clay Adsorbents Modified by Mono-, Di- and Triethanolamine Compounds

Abstract:

A series of organic-inorganic hybrids were developed via intercalation process of primary, secondary and tertiary ammonium cations into different alkali and alkaline earth and transition metal cation forms of bentonite clay to be used as adsorbent materials for CO₂ capture under ambient temperature and slightly high pressure. The effect of the molar mass of amines on the structural characteristics, surface properties and CO₂ loading capacity of bentonite clay were investigated by X-ray diffraction, Brunauer-Emmett-Teller method and Magnetic Suspension Balance equipment, respectively. X-ray diffraction results revealed that the basal spacing of bentonite clay after modification with amines was increased with the molar mass of amine used, while BET results showed an inverse effect of the molar mass of amines on the surface area of the synthesized materials. The CO₂ loading capacity of the examined samples revealed that bentonite clay modified with monoethanolammonium cations retained higher CO₂ amount compared to those modified with di-and triethanolammonium cations. CO₂ adsorption isotherms on MEA⁺-Mg-MMT were conducted at 298, 323 and 348 K and different pressures. A decrease in CO₂ uptake with increasing temperature was observed, suggesting the exothermic nature of the adsorption process.

• Periodical: Advanced Materials Research (Volume 917)
• Pages: 115-122
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.917.115
• Online since: June 2014
• Authors: Ali E.I. Elkhalifah*, Mohammad Azmi Bustam, Mohd Shariff Azmi, T. Murugesan
• Keywords: Amine, Bentonite, CO₂ Adsorption, Intercalation, Organoclay

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