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Improved arsenite adsorption using iron-impregnated marble dust with surface functionalized by quaternary ammonium ions

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Abstract

The present study investigates the application of marble dust impregnated with iron and functionalized with quaternary ammonium ions [using ammonium persulphate (APS)] as a novel adsorbent for the removal of arsenite ions from wastewater. The optimal modification parameters were found to be 0.1 M FeCl3, 0.125% NaOH (w/v) and 0.0125 M of APS at a temperature of 80 °C. The maximum uptake capacity of As(III) ions was found to be 50 mg/g with 3.5 g/L of adsorbent for 90 min at pH = 7.0. Maximum negative ∆G° value (− 7.7 kJ/mol) was obtained at 298 K, indicating that low temperature favoured adsorption. Freundlich and Temkin isotherm models gave the best correlation coefficient (R2 > 0.95). The kinetic data were suitably described by pseudo-second-order kinetics. Film diffusion was inferred to be the rate-controlling mechanism based on Boyd plots. The synthesized adsorbent can be regenerated by flushing with an alkaline solution.

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Acknowledgements

The authors are thankful to Technical Education Quality Improvement Programme (TEQIP-III) for proving the required funding to carry out the experiments and Centre for Interdisciplinary Research (CIR) of MNNIT Allahabad for allowing us to carry out sample characterizations.

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Correspondence to A. D. Gupta.

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Editorial responsibility: Binbin Huang.

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Gupta, A.D., Singh, H., Jaiswal, V.K. et al. Improved arsenite adsorption using iron-impregnated marble dust with surface functionalized by quaternary ammonium ions. Int. J. Environ. Sci. Technol. 18, 2955–2974 (2021). https://doi.org/10.1007/s13762-020-03013-3

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  • DOI: https://doi.org/10.1007/s13762-020-03013-3

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