Synthesis and characterization of rGO/ZrO2 nanocomposite for enhanced removal of fluoride from water: kinetics, isotherm, and thermodynamic modeling and its adsorption mechanism

Synthesis and characterization of rGO/ZrO2 nanocomposite for enhanced removal of fluoride from water: kinetics, isotherm, and thermodynamic modeling and its adsorption mechanism

A nanocomposite of rGO/ZrO 2 prepared by a simple hydrothermal method using GO and ZrOCl 2 ·8H 2 O has been successfully utilized for the removal of fluoride from aqueous solutions by adsorption. The synthesized nanocomposite was characterized by various techniques, such as FT-IR, XRD, SEM, EDX, TGA...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (9), p.87523-87538
Main Authors: Mohan, Sweta, Kumar, Vijay, Singh, Devendra Kumar, Hasan, Syed Hadi
Format: Article
Language:eng
Subjects:
Adsorption
Fluorides
Isotherms
Nanocomposites
Surface chemistry
Thermodynamics
Zirconium dioxide
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Summary:A nanocomposite of rGO/ZrO 2 prepared by a simple hydrothermal method using GO and ZrOCl 2 ·8H 2 O has been successfully utilized for the removal of fluoride from aqueous solutions by adsorption. The synthesized nanocomposite was characterized by various techniques, such as FT-IR, XRD, SEM, EDX, TGA, XPS, Raman spectroscopy and BET surface area measurement. Various process parameters viz. rGO/ZrO 2 dose, initial fluoride concentration, temperature and pH, which influence the removal of fluoride, were studied and it was found that the maximum uptake capacity of the nanocomposite was 46 mg g −1 at 30 °C, pH 7, rGO/ZrO 2 dose of 0.5 g L −1 and initial fluoride concentration of 25 mg L −1 . The rGO/ZrO 2 possesses a high surface area (632 cm 2 g −1 ) and maximum adsorption occurs at neutral pH and ambient temperature. Therefore, rGO/ZrO 2 can be used for the adsorption of fluoride without much alteration in the quality of drinking water. The experimental data was applied to various kinetics, isotherm and thermodynamic studies. The monolayer adsorption of fluoride followed a pseudo-second order kinetic model, which was found to be spontaneous and endothermic in nature. The results obtained from the current adsorption system might be helpful for designing a continuous column system for the treatment of fluoride contaminated water. A nanocomposite of rGO/ZrO 2 prepared by a simple hydrothermal method using GO and ZrOCl 2 ·8H 2 O has been successfully utilized for the removal of fluoride from aqueous solutions by adsorption.
ISSN:2046-2069