Chitosan-Graphene Oxide Hydrogels with Embedded Magnetic
Iron Oxide Nanoparticles for Dye Removal
Nirbhai Singh
Sk Riyajuddin
Kaushik Ghosh
Surinder K. Mehta
Abhijit Dan
10.1021/acsanm.9b01909.s001
https://acs.figshare.com/articles/journal_contribution/Chitosan-Graphene_Oxide_Hydrogels_with_Embedded_Magnetic_Iron_Oxide_Nanoparticles_for_Dye_Removal/10278038
We report a facile
design and synthesis of magnetic iron oxide
(IO) incorporated chitosan-graphene oxide (CSGO) hydrogel nanocomposites
(CSGOIO) by employing <i>in situ</i> mineralization of iron
ions in a hydrogel matrix. The mechanism of their formation was investigated
by various physical methods, viz., FTIR, XRD, VSM, TGA, SEM, TEM,
and BET. This approach was shown to have a direct impact on the morphological
features and the structural order of the nanocomposites. The potential
of the prepared nanocomposites for effective removal of a cationic
dye, methylene blue (MB), from aqueous solution was investigated by
performing a series of batch adsorption experiments, in line with
the effect of adsorbent dosage, initial dye concentration, contact
time, pH, ionic strength, and temperature. The adsorption was fairly
influenced by the pH and ionic strength of the medium, indicating
an electrostatic interaction between the adsorbent and MB molecules.
The kinetics of adsorption followed a pseudo-second-order model, and
equilibrium capacity was described by the Freundlich adsorption model.
Interestingly, the nanocomposites exhibited a fast removal performance
with a rate constant of 0.06 g mg<sup>–1</sup> min<sup>–1</sup>. The hydrogel nanocomposites were found to possess an excellent
adsorptive property after four successive cycles at different pH of
the solution, thus providing a cost-effective material for dye removal
applications. Therefore, this material, enabling dye removal in a
wide variety of solution conditions, offered a promising platform
for sustainable development of water purification technology.
2019-11-08 22:31:18
material
water purification technology
solution
Magnetic Iron Oxide Nanoparticles
CSGOIO
BET
XRD
CSGO
MB
batch adsorption experiments
IO
FTIR
pH
TEM
SEM
dye removal applications
Chitosan-Graphene Oxide Hydrogels
oxide
hydrogel nanocomposites
strength
TGA
adsorbent
Freundlich adsorption model
VSM