A novel superadsorbent β-cyclodextrin crosslinked coffee grounds biopolymer to remove organic molecules from water matrices

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2025-02-19 DOI:10.1016/j.molstruc.2025.141800

Fakhreddine Ben Amara , Franciele da Silva Bruckmann , Suliman Yousef Alomar , Marcos Leandro Silva Oliveira , Luis Felipe Oliveira Silva , Guilherme Luiz Dotto , Samir Bejar , Sonia Jemli

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Abstract

Herein, a new superadsorbent was synthesized via a crosslinking reaction using β-cyclodextrin and coffee grounds and employed to remove two organic cationic molecules, methylene blue and crystal violet. The interactions between adsorbent-adsorbate in aqueous media were also investigated. The material was characterized by FTIR, XRD, SEM, EDX, and DSC techniques, and adsorption was investigated through the kinetic, isotherms, and thermodynamic parameters. Sips isotherm was the more suitable model for fitting the adsorption equilibrium, while the pseudo-first-order model for both dyes described the kinetic data well. The new adsorbent presented impressive adsorption capacity values, higher than 1500 mg g⁻¹. This high adsorption capacity results from three main mechanisms: electrostatic attraction, hydrogen bonds, and hydrophobic interactions between the hydrophobic parts of dyes and the inner hydrophobic cavity of cyclodextrin. Thermodynamic parameters revealed an endothermic and spontaneous process with increased randomness in the liquid-solid interface. Overall, the adsorbent exhibited an excellent performance for dye removal and potential use in wastewater treatment plants.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.