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

IF 4.7 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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一种新型超吸附剂β-环糊精交联咖啡渣生物聚合物，用于去除水基质中的有机分子

本文以β-环糊精和咖啡渣为原料，通过交联反应合成了一种新型超吸附剂，并用于去除亚甲基蓝和结晶紫两种有机阳离子分子。研究了吸附剂-吸附物在水介质中的相互作用。采用FTIR、XRD、SEM、EDX和DSC等技术对材料进行了表征，并通过动力学、等温线和热力学参数考察了材料的吸附性能。Sips等温线模型更适合于拟合吸附平衡，而两种染料的拟一阶模型都能很好地描述动力学数据。新型吸附剂的吸附容量值高于1500mg g−1。这种高吸附能力主要来自三个机制：静电吸引、氢键和染料疏水部分与环糊精内部疏水腔之间的疏水相互作用。热力学参数显示为吸热自发过程，且液固界面随机性增加。总体而言，该吸附剂表现出优异的染料去除性能，在污水处理厂具有潜在的应用前景。

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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.