Abstract
The study investigated the adsorption of sulfamethoxazole, a pharmaceutical water contaminant, on an adsorbent derived from reed canary grass. Adsorption isotherm data at different temperatures were analyzed by the Langmuir, Freundlich, Sips, Dubinin-Radushkevich, Fowler–Guggenheim, and Nitta isotherm models. Among the various isotherm models, Sips model simulated the experimental adsorption data slightly better with the least error, indicating a heterogeneous monolayer adsorption system with a maximum adsorption capacity of 147.9 mg/g and heterogeneity index of 1.15. Investigation of the Fowler–Guggenheim and Nitta models showed that interaction energy of adsorbed molecules was insignificant. Thermodynamic parameters were determined using Henry constants. Henery constants were 22.7, 17.5, and 10.8 L/g at 15℃, 25℃, and 35℃. The change in enthalpy of adsorption was -27.5 kJ/mol, showing that the process is exothermic and physiosorption. The change in standard entropy was -23.2 J/(mol·K), suggesting a decrease in randomness during the adsorption process. Weighted mean of site energy distribution remained constant at 11.2 when adsorption temperature was increased from 15℃ to 25 ℃, and the weighted mean slightly decreased to 9.6 at 35 ℃, indicating weaker interactions at the higher temperature. The methodology used in this work to analyze interaction energy between adsorbed molecules can be transferrable to analyze data of adsorption of other pharmaceuticals or organics by various types of adsorbents.
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References
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Acknowledgements
The authors also would like to thank Dr. Jeff Schoenau, Professor of Department of Soil Science at the University of Saskatchewan for providing with raw reed canary grass. The authors would like to thank Mrs. Dushmanthi Jayasinghe, technician at the Department of Chemical and Biological Engineering of the University of Saskatchewan, for providing support to operate the HPLC instrument.
Funding
Natural Sciences and Engineering Research Council of Canada (No. RGPIN-2019–4813), Canada Foundation for Innovation (No. 11357), University of Saskatchewan’s Dean’s Scholarship, University of Saskatchewan’s Devolved Scholarship, and University of Saskatchewan’s Graduate Teaching Fellowship are highly appreciated for the financial support.
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• Mr. Mohammad Amin Zamiri designed and conducted experiments and prepared and revised the manuscript.
• Dr. Catherine Hui Niu was the research supervisor, who provided comments on experiments and manuscript and revised the manuscript.
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Zamiri, M.A., Niu, C.H. Adsorption of sulfamethoxazole on a biochar developed from reed canary grass: characteristics of adsorption equilibrium and energetical analysis. Biomass Conv. Bioref. (2024). https://doi.org/10.1007/s13399-023-05253-y
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DOI: https://doi.org/10.1007/s13399-023-05253-y