Aminated graphite oxides and their composites with copper-based metal-organic framework: in search for efficient media for CO2 sequestration

New composites of a copper-based metal-organic framework and graphite oxide modified by urea (GO-U) were synthesized. The materials and the parent composite components were characterized using X-ray diffraction, FT-IR spectroscopy, potentiometric titration, sorption of nitrogen, thermal analysis, elemental analysis, Raman spectroscopy, UV-Vis spectroscopy, and scanning electron microscopy. The introduction of GO-U does not prevent the formation of MOF crystal structure. The synergistic effect of the composite formation is clearly seen in the surface features. The new materials exhibit a unique texture, high porosity and nitrogen enriched surface chemistry. Incorporation of amino groups in the specific chemical and structural environment enhances CO2 adsorption. Therefore, this kind of composites has a potential application in CO2 capture technologies to remit global warming.