Ali Elkhalifah
Al-Neelain University, Sudan
Title: CO2 adsorption equilibria on calcium exchanged bentonite modified by mono-, di- and triethanolamines
Biography
Biography: Ali Elkhalifah
Abstract
This research work investigates the adsorption characteristics of carbon dioxide on calcium form of bentonite modified by amines at ambient conditions. For this purpose, the native exchangeable cations initially presented in the interlayer space of bentonite were replaced by calcium ions, and then the exchanged bentonite was further treated with protonated mono-, di- and tri-ethanolamines via intercalation process. The characteristics of the prepared hybrids were analyzed by XRD, BET and TGA techniques. XRD results revealed that a gradual increase in the basal spacing of bentonite with an increase in the molar mass of amines was observed. Conversely, low surface area values for bentonite were recorded by BET method. However, the thermal analysis (TGA) of the samples showed a shift to lower values in the amount of the physically adsorbed water as well as its desorption temperature. Static adsorption of CO2 on amine-bentonite adsorbents at ambient conditions showed that the molar mass of amine has an inverse effect on the gas adsorption capacity, where bentonite modified by monoethanolamine adsorbed 0.6 mmol/g compared to 0.4 and 0.3 on that one treated with di- and triethanolamines due to the pore opening effect and a consequential higher surface area.
Recent Publications:
1.Ali E I Elkhalifah (2016) Development and characterization of amine-clay hybrid adsorbents for CO2 capture. Advanced Materials Research 1133: 547-551.
2. Ali E I Elkhalifah (2015) Selective adsorption of CO2 on a re-generable amine-bentonite hybrid adsorbent. Applied Clay Science 101: 213-219.
3. Ali E I Elkhalifah (2013) Effects of exchanged ammonium cations on structure characteristics and CO2 adsorption capacities of bentonite clay. Applied Clay Science 84: 391-398.
4. Ali E I Elkhalifah (2013) Thermal properties of different transition metal forms of montmorillonite intercalated with mono-, di-, and triethanolammonium compounds. Journal of Thermal Analysis and Calorimetry 112: 929-935.
5. Ali E I Elkhalifah (2011) Thermogravimetric analysis of different molar mass ammonium cations intercalated different cationic forms of montmorillonite. Journal of Thermal Analysis and Calorimetry 110: 765-771.
