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Hydrothermally Shape-Controlled Synthesis of TiO2/Graphene for Fluoride Adsorption Studies
journal contribution
posted on 2019-10-17, 15:35 authored by Sapna Nehra, Manjula Nair, Dinesh KumarAlthough
graphene has great potential in mitigating hazardous constituents
that exist in wastewater,
its stability, aggregation, and reusability are points of concern.
To overcome this problem, we have prepared graphene incorporated with
titanium oxide recyclable adsorbent by a hydrothermal strategy for
the removal of fluoride from an aqueous system. The pristine graphene
oxide with titanium oxide graphene (TiO2–GO) nanocomposite
was analyzed using several interpretative tools, namely, field emission
scanning electron microscopy, Brunauer–Emmett–Teller,
Fourier transform infrared, X-ray diffraction, and X-ray photoelectron
spectroscopy. The TiO2–GO nanocomposite exhibited
good adsorption toward the toxic fluoride ion, with an adsorption
capacity of 342 mg/g at pH 6.0 and a high surface area of 278 m2/g. Thermodynamic parameters ΔG°,
ΔH°, and ΔS°
revealed that adsorption is endothermic and spontaneous, and the equilibrium
condition is favored by Langmuir, Freundlich, Dubinin–Radushkevich,
and Temkin adsorption isotherms. Adsorption–desorption up to
the sixth cycle without the release of nanomaterial in solution confirms
its reusability. Consequently, TiO2–GO adsorbent
is a promising adsorbent owing to its sustainability, reusability,
and efficient adsorption, even in the presence of foreign ions in
wastewater.
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Keywords
surface areaFluoride Adsorption Studiesnanocompositegraphene oxidereusabilityadsorption capacityequilibrium conditiontitanium oxideTemkin adsorption isothermsX-ray diffractionhydrothermal strategyHydrothermally Shape-Controlled Synthesisfield emission scanning electron microscopyfluoride ionTiOpH 6.0adsorbenttitanium oxide grapheneX-ray photoelectron spectroscopywastewater
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