UiO-66-NH(2)/GO Composite: Synthesis, Characterization and CO(2) Adsorption Performance

In this work, a new composite materials of graphene oxide (GO)-incorporated metal-organic framework (MOF)(UiO-66-NH(2)/GO) were in-situ synthesized, and were found to exhibit enhanced high performances for CO(2) capture. X-ray diffraction (XRD), scanning electron microscope (SEM), N(2) physical adsorption, and thermogravimetric analysis (TGA) were applied to investigate the crystalline structure, pore structure, thermal stability, and the exterior morphology of the composite. We aimed to investigate the influence of the introduction of GO on the stability of the crystal skeleton and pore structure. Water, acid, and alkali resistances were tested for physical and chemical properties of the new composites. CO(2) adsorption isotherms of UiO-66, UiO-66-NH(2), UiO-66/GO, and UiO-66-NH(2)/GO were measured at 273 K, 298 K, and 318 K. The composite UiO-66-NH(2)/GO exhibited better optimized CO(2) uptake of 6.41 mmol/g at 273 K, which was 5.1% higher than that of UiO-66/GO (6.10 mmol/g). CO(2) adsorption heat and CO(2)/N(2) selectivity were then calculated to further evaluate the CO(2) adsorption performance. The results indicated that UiO-66-NH(2)/GO composites have a potential application in CO(2) capture technologies to alleviate the increase in temperature of the earth’s atmosphere.