Journal of Natural Gas Science and Engineering | 2019
Synthesis and characterization of iso-reticular metal-organic Framework-3 (IRMOF-3) for CO2/CH4 adsorption: Impact of post-synthetic aminomethyl propanol (AMP) functionalization
Abstract
Abstract In this study, an iso-reticular metal-organic framework-3(IRMOF-3) exhibiting microporosity was synthesized from organic linker 2-amino terephthalic acid and salt zinc nitrate hexahydrate (Zn-(NO3)2.6H2O) via catalyst-free, solution-based direct mixing technique. Three samples of IRMOF-3 were post-synthetically functionalized with aminomethyl propanol (AMP) with three different concentrations of 25\u202fwt%, 50\u202fwt% and 75\u202fwt% to produce AMP@IRMOF-3. The structural and texture properties of AMP@IRMOF-3 were studied by FESEM, FTIR, pore size distribution, powder XRD, TGA/DTG, N2 adsorption-desorption isotherms, their selective CO2/CH4 adsorption behaviour over various temperatures (298.15\u202fK, 323.15\u202fK, and 348.15\u202fK). The results showed an enhancement in CO2 adsorption capacity from 1.39\u202fmmol/g to 3.90\u202fmmol/g due to successful incorporation of CO2 philic functionalities. Furthermore, the adsorption isotherms were studied by applying Langmuir, Freundlich, Langmuir-Freundlich, and Toth isotherm models. The isotherms study revealed the unfavourable adsorption behaviour with an increase in AMP loadings with a homogenous system.