(377z) MOF-GO Hybrid Nanocomposite Adsorbents for Methane Storage
In this study, the storage of methane in nanocomposite adsorbents comprising of metal-organic framework (MOF) and graphene oxide (GO) was investigated. Three different sets of MOF-GO nanocomposites comprising of HKUST-1 and pristine GO, reduced GO (rGO), and carboxyl-functionalized GO (fGO) were developed by solvothermal method and their methane storage characteristics were assessed through high-pressure methane adsorption measurements. The formation of MOF-GO nanocomposites was confirmed by XRD, FTIR, XPS, SEM, and TEM. All three types of nanocomposites exhibited higher surface area and porosity than the pristine MOF. Our results indicated that MOF@rGO nanocomposite with 10wt% rGO exhibited the best performance with a methane deliverable capacity of 193 cm3(STP)/cm3 in the pressure range of 5.8-65 bar and at room temperature which was approximately 30% higher than that of pristine HKUST-1 with capacity of 149 cm3(STP)/cm3. Moreover, the methane deliverable capacity of MOF@GO and MOF@fGO were found to be 181 and 162 cm3(STP)/cm3, respectively. The findings of this study demonstrate the synergistic effect of graphene oxide on methane storage performance of MOF-GO nanocomposites.