Abstract
New composites have been synthesized containing nanographite (nGr)
particles as platforms for the deposition of UiO-66 crystals. The
samples were analyzed by X-ray diffraction, thermogravimetry, N2
adsorption and scanning electron microscopy. The addition of nGr
markedly increased the porosity determined by N2 adsorption (0.5 nm
ultramicropores were formed, and the volume in pores > 1.1
nm increased). This was the result of defects formation either on UiO-66
or at the nGr/UiO-66 interface. To assess the adsorptive properties and
the accessibility of the pores, adsorption of H2, CO2, C2H4 and C2H6 was
measured. The results have shown that not only the extent of the
porosity but also the interactions with the graphite phase and the
accessibility to the pores affect the amount adsorbed and the strength
of adsorption. Generally, the formation of composites had a positive
effect on the adsorption properties owing to an increased surface
heterogeneity and porosity.