10.1021/am401887g.s001
Gao Wei
Gao
Wei
Yue-E Miao
Yue-E
Miao
Chao Zhang
Chao
Zhang
Zhe Yang
Zhe
Yang
Zhenyan Liu
Zhenyan
Liu
Weng Weei Tjiu
Weng Weei
Tjiu
Tianxi Liu
Tianxi
Liu
Ni-Doped Graphene/Carbon Cryogels and Their Applications
As Versatile Sorbents for Water Purification
American Chemical Society
2013
recycling use
cryogel
carbonization process
RF skeletons
graphene oxide
gelation process
metal ions
NGCC
hydrogel precursor
bulk form
Versatile Sorbents
Ni nanoparticles
2013-08-14 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Ni_Doped_Graphene_Carbon_Cryogels_and_Their_Applications_As_Versatile_Sorbents_for_Water_Purification/2386858
Ni-doped
graphene/carbon cryogels (NGCC) have been prepared by adding resorcinol
and formaldehyde to suspension of graphene oxide (GO), using Ni<sup>2+</sup> ions as catalysts for the gelation process to substitute
the usually used alkaline carbonates. The metal ions of Ni<sup>2+</sup> have elevated the cross-linking between GO and RF skeletons, thus
strengthening the whole cryogel. The as-formed three-dimensional (3D)
interconnected structures, which can be well-maintained after freeze-drying
of the hydrogel precursor and subsequent carbonization under an inert
atmosphere, exhibit good mechanical properties. During the carbonization
process, Ni<sup>2+</sup> ions are converted into Ni nanoparticles
and thus embedded in the interconnected structures. The unique porosity
within the interconnected structures endows the cryogels with good
capability for the extraction of oils and some organic solvents while
the bulk form enables its recycling use. When ground into powders,
they can be used as adsorbents for dyestuffs. Therefore, the as-obtained
cryogels may find potential applications as versatile candidates for
the removal of pollutants from water.