1 research outputs found
Oxygen-Content-Controllable Graphene Oxide from Electron-Beam-Irradiated Graphite: Synthesis, Characterization, and Removal of Aqueous Lead [Pb(II)]
A high-energy electron beam was applied
to irradiate graphite for the preparation of graphene oxide (GO) with
a controllable oxygen content. The obtained GO sheets were analyzed
with various characterization tools. The results revealed that the
oxygen-containing groups of GO increased with increasing irradiation
dosages. Hence, oxygen-content-controllable synthesis of GO can be
realized by changing the irradiation dosages. The GO sheets with different
irradiation dosages were then used to adsorb aqueous PbĀ(II). The effects
of contact time, pH, initial lead ion concentration, and ionic strength
on PbĀ(II) sorption onto different GO sheets were examined. The sorption
process was found to be very fast (completed within 20 min) at pH
5.0. Except ionic strength, which showed no/little effect on lead
sorption, the other factors affected the sorption of aqueous PbĀ(II)
onto GO. The maximum PbĀ(II) sorption capacities of GO increased with
irradiation dosages, confirming that electron-beam irradiation was
an effective way to increase the oxygen content of GO. These results
suggested that irradiated GO with a controllable oxygen content is
a promising nanomaterial for environmental cleanup, particularly for
the treatment of cationic metal ions, such as PbĀ(II)