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Effective removal of non-steroidal anti-inflammatory drug from wastewater by adsorption process using acid-treated Fagopyrum esculentum husk

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Abstract

In this work, buckwheat husks (Fagopyrum esculentum) were modified by acid treatment and posteriorly employed to remove the ketoprofen in batch adsorption. The characterization results indicated that a more irregular surface with new empty spaces was generated after acid treatment. The adsorptive process was favored at acidic pH = 3. The dosage of 0.85 g L−1 was fixed for the kinetic and isothermal tests, obtaining good removal and capacity indications. The kinetic studies were better represented by pseudo-second-order, obtaining an experimental capacity of 74.3 mg g−1 for 200 mg L−1 of ketoprofen. An increase in temperature negatively affected the adsorption isotherm curves, resulting in a maximum capacity of 194.1 mg g−1. Thermodynamic results confirmed the exothermic nature of the process with physical forces acting. The adsorbent presented high efficiency in treating a synthetic effluent containing different drugs and salts, 71.2%. Therefore, adsorbent development from buckwheat husks treated with a strong acid is an excellent alternative, given the good removal results and the low cost for its preparation.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study is funded by CAPES (Coordination for the Improvement of Higher Education Personnel) and CNPq (National Council for Scientific and Technological Development).

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Conceptualization: [D. S. P. Franco, G. L. Dotto]; Methodology: [M. S. Neto, J. Georgin]; Formal analysis and investigation: [D. S. P. Franco, J. Georgin, M. S. Netto]; Writing—original draft preparation: [M. S. Netto, D. Allasia, E. l. Foletto]; Writing—review and editing: [G. L. Dotto, E. L. Foletto, M. L. S. Oliveira]; Funding acquisition: [G. L. Dotto, E. L. Foletto, D. Pinto]; Supervision: [G. L. Dotto]. All authors read and approved the final manuscript.

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Correspondence to Guilherme L. Dotto.

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Franco, D.S.P., Georgin, J., Netto, M.S. et al. Effective removal of non-steroidal anti-inflammatory drug from wastewater by adsorption process using acid-treated Fagopyrum esculentum husk. Environ Sci Pollut Res 29, 31085–31098 (2022). https://doi.org/10.1007/s11356-021-17846-z

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  • DOI: https://doi.org/10.1007/s11356-021-17846-z

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