Adsorption
is an important technique for the separation and purification
of various gases. In this study, two types of graphene materials with
various morphologies are employed to modify metal–organic frameworks
(MOFs) and improve their adsorption capacities. SEM, XRD, as well
as Raman and IR spectroscopies are adopted to analyze the microstructures
of these as-prepared samples. After the combination process, the adsorption
abilities of UiO-66 and ZIF-8 are enhanced significantly (an increase
of more than 48% for the n-hexane adsorption), and
the adsorption amounts of CO2, methanol, and n-hexane reach 9.32, 17.48, and 4.26 mmol g–1, respectively.
The remarkably improved performances are induced by the more favorable
orbit interaction between the graphene basal plane and the adsorbed
gases. Moreover, the natural three-dimensional (3D) continuous and
porous structure of the 3D graphene network is not only beneficial
to the adsorption ability but also improves the stability of MOFs
at a high temperature.