Abstract
This study explores the possibility of developing an eco-friendly adsorbent for effective remediation of groundwater fluoride, a well-known health hazard affecting more than 25 nations on the various continents. A facile and milder approach has been adopted to synthesize chitosan-modified ZnO/ZnFe2O4 nanocomposites. The synthesized materials have been characterized by different spectroscopic, microscopic, and diffractometric techniques. X-ray photoelectron spectroscopy and X-ray diffraction studies have confirmed the formation of pure and highly crystalline ZnO/ZnFe2O4 nanocomposites. The presence of surface-adsorbed chitosan in the modified ZnO/ZnFe2O4 has been confirmed by FT-IR and thermogravimetric analysis. The results from microscopic and BET surface area analysis of ZnO/ZnFe2O4 nanocomposites indicated that chitosan plays a crucial role in modulating the surface morphology and surface properties of the nanocomposites. The nanocomposites exhibit excellent adsorption performance in the remediation of groundwater fluoride. Experimental conditions have been systematically designed to evaluate the optimum adsorption condition for fluoride, and the results have been analyzed with various non-linear models to describe the kinetics and isotherms of adsorption. The adsorption primarily follows Lagergren pseudo-first-order kinetics, and the Langmuir adsorption capacity is varied from 10.54 to 13.03 mg g−1 over the temperature range 293–323 K. The thermodynamics study reveals that the adsorption process is endothermic and spontaneous. The mechanism of adsorption has been proposed based on the spectroscopic analysis of the fluoride-loaded adsorbent. The adsorption is non-specific in nature as co-existing anion can reduce its fluoride removal capacity. The effect of the co-existing anions on adsorption of fluoride follows the trend PO43− > CO32− > SO42− > Cl−. The adsorbent can be reused successfully for the 5th consecutive cycles of adsorption-desorption study. This study offers a very promising material for remediation of groundwater fluoride of affected areas.
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Acknowledgments
We thank Mr. Debajit Gogoi, Research Scholar, Department of Chemistry, Tezpur University, for supplying the field water sample. We also thank SAIF-GU, NEIST-Jorhat, STIC-Cochin, and CNN-JMI for extending their instrumental facilities to us.
Funding
GKS acknowledges the Science and Engineering Research Board, India, for providing the fellowship (N-PDF File No. PDF/2016/000110). Raju Sharma is grateful to IASc-INSA-NASI, India, for providing fellowship under Focus Area Science Technology Summer Fellowship to carry out the research.
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Electronic Supplementary Information provides the detail of characterization of the products; adsorption isotherm and kinetics data; water quality parameters and comparison of the performance of various adsorbent (Table S1 to S3) and Figures S1 to S8. This material is available free of cost either from the author or from the publisher at the website https//www. (PDF 1185 kb)
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Sarma, G.K., Sharma, R., Saikia, R. et al. Facile synthesis of chitosan-modified ZnO/ZnFe2O4 nanocomposites for effective remediation of groundwater fluoride. Environ Sci Pollut Res 27, 30067–30080 (2020). https://doi.org/10.1007/s11356-020-09270-6
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DOI: https://doi.org/10.1007/s11356-020-09270-6