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Removal of cadmium(II) from aqueous solution by hydroxyapatite-encapsulated zinc ferrite (HAP/ZnFe2O4) nanocomposite: kinetics and isotherm study

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Abstract

In this study, HAP/ZnFe2O4 nanocomposite has been synthesized in two simple steps. The different characterization techniques confirm the fabrication of HAP/ZnFe2O4 magnetic binary nanocomposite. The composite was successfully applied as nanoadsorbent for the elimination of Cd(II) ions from its aqueous solution. The composite was able to remove 89.6% of Cd(II) ions under optimum experimental conditions. The equilibrium sorption data were very much in agreement with the Freundlich adsorption model, and the maximum sorption capacity was recorded to be 120.33 mg/g. Kinetic data of the cadmium ion removal was well concurrent with the pseudo-second-order kinetics rate model. This magnetic HAP/ZnFe2O4 nanocomposite can be applied as an environmentally friendly, low-cost, productive sorbent for the evacuation of Cd(II) ions from wastewater in light of its high sorption capacity.

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Acknowledgments

The authors deeply acknowledged the National Institute of Technology, Silchar, and Gurucharan College, Silchar, India; Indian Institute of Technology, Guwahati, India; Tezpur University, Assam, India; and Sophisticated Test and Instrumentation Centre, Cochin University of Science and Technology, Kerala, India, for analytical facilities.

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Correspondence to Krishna Chandra Das.

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Responsible editor: Tito Roberto Cadaval Jr

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Das, K.C., Dhar, S.S. Removal of cadmium(II) from aqueous solution by hydroxyapatite-encapsulated zinc ferrite (HAP/ZnFe2O4) nanocomposite: kinetics and isotherm study. Environ Sci Pollut Res 27, 37977–37988 (2020). https://doi.org/10.1007/s11356-020-09832-8

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  • DOI: https://doi.org/10.1007/s11356-020-09832-8

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