Effect of canopy structures on CO₂ capture capacity and properties of NONMs

Novel nanoparticle organic hybrid materials (NOHMs), which have the potential for carbon dioxide physical-chemical capture capacity, have been synthesized. Multi-walled nanotubes (MWNTs), which have the physical storage capacity for gas, were assembled as the core of NOHMs. The surface of MWNTs was functionalized with Jeffamine M-2070 and M-1000 (polyetheramines), which can absorb carbon dioxide via chemical reaction. The structure of NOHMs was verified by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and UV-Vis spectroscopy. The weight percentages of MWNTs in NOHMs are 22.1 wt% and 21.4 wt%, respectively. Differential scanning calorimetry (DSC) curves show that the relative crystallinity percent of NOHMs-M2070 and NOHMs-M1000 is 38.88 and 40.56 %, respectively. Transmission electron microscopy (TEM) images show the morphology and structure of NOHMs at the nanometer level. Theological properties of NOHMs exhibit the viscosity and elasticity of NOHMs generated from liquid-like behavior varying the temperature and stress. CO₂ capture capacity is tested from 0 to 6 MPa at 298 K. The amine groups, ether groups, and physical interaction between MWNTs and JEFFAMINE have significant effect on CO₂ capture capacity. The storage property of MWNTs contributes to CO₂ capture capacity. NOHMs based on MWNTs with excellent regeneration capacity have the promising potential for CO₂ capture.