A MIL-101(Cr) and Graphene Oxide Composite for Methane-Rich Stream Treatment

Composite materials of MIL-101(Cr) and graphene oxide (GO) were synthesized with various concentrations of the two materials using the solvothermal method. The composites were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR), and N2 adsorption–desorption isotherms (Brunnauer, Emmett, and Teller surface area measurement). Methyl mercaptan (MeSH), CO2, and CH4 adsorption capacities of samples were measured using a homemade volumetric apparatus. The results indicated that the hybrid material, which contained ∼5 wt % graphene oxide, exhibited the highest capacity and reversibility toward MeSH and CO2 sorption. Increases of ∼12 and ∼30% in adsorption capacity in comparison to that of pure MIL-101 for CO2 and MeSH, respectively, were observed for MIL-101@GO 5 wt %. The MeSH adsorptive capacity on MIL-101 and MIL-101@GO composites was analyzed for the first time in this study, and a high uptake (∼32 mmol/g) was obtained. The obtained adsorptive capacity is the highest reported ...