Lanthanum impregnated chitosan/β-cyclodextrin
(CS–La−βCD)
composite was prepared using a facile in situ fabrication
method and successfully evaluated for the adsorption of CrO4
2– and F–. The pristine and treated
CS–La−βCD was characterized using Fourier transform
infrared, scanning electron microscopy, energy dispersive X-ray spectroscopy
with mapping, X-ray diffraction, and thermal gravametric analytical
techniques. The optimum conditions for the uptake of CrO4
2– and F– were investigated as
a function of shaking time, dosage, initial ion concentration, pH,
and predatory ions in batch experiments. The equilibrium data were
fitted using Langmuir, Freundlich, and Dubinin–Radushkevich
models for the defluoridation and sorption of chromium onto CS–La−βCD.
The adsorption kinetics of CrO4
2– and
F– followed the pseudo-second order model. The maximum
Langmuir adsorption capacity was found to be 91.58 mg/g and 8.14 mg/g
for CrO4
2– and F–,
respectively at 303 K. Sequential adsorption and desorption studies
were carried out up to five cycles using 0.1 M of NaOH as an eluent
to check the reusability of the adsorbents.
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