Effects of acidification time of MWCNTs on carbon dioxide capture of liquid-like MWCNTs organic hybrid materials

In this study, liquid-like multi-walled carbon nanotubes (MWCNTs) nanoparticle organic hybrid materials (MWCNTs-NOHMs) were prepared without solvent at room temperature (25 degrees C) by employing MWCNTs with different acidification times as the core, KH560 as the corona and M2070 as the canopy. The acidification time of MWCNTs on CO2 capture capacity of the MWCNTs-NOHMs was investigated. The number of amine groups on the surface of the MWCNTs-NOHMs increased with the prolongation of acidification time. The CO2 capture capacity of the MWCNTs-NOHMs decreased with the extension of the acidification time for the MWCNTs. This is due to the superior fluidity and poorer viscosity of the MWCNTs-NOHM left in acid for a shorter time period. The superior fluidity and poorer viscosity provided larger molecule intervals and weaker intermolecular forces, making it easier for CO2 to charge into the potential space. CO2 can react with amine groups. However, because of the low fluidity and the high viscosity of the MWCNTs-NOHM left in acid for a longer time, its physisorption was unsatisfactory. Chemisorption was also influenced via reducing the contact between CO2 and the reactive groups. The regeneration capacity and adsorption stability of the MWCNTs-NOHMs are great, rendering them as potential materials for CO2 adsorption.