Copper oxide-graphene frameworks as a novel catalyst for oxidative adsorption removal of eosin from aqueous solutions

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2025-02-03 DOI:10.1016/j.molstruc.2025.141646

Harez Rashid Ahmed , Adil Omer Baba Shekh , Mohammed Ali Salih , Daban Noori Hama Saeed , Anu Mary Ealias , Giphin George

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Abstract

This study presents the synthesis and characterization of copper-loaded graphene frameworks (CuOG_F) and graphene oxide (GO) as dual-function catalysts for Eosin dye's combined adsorption and oxidation. Advanced characterization techniques, including FTIR, BET, XRD, SEM, EDX, and TEM, validated the materials' structural properties, surface area, and distribution of active sites. Adsorption kinetics were best described by the Elovich and pseudo-second-order models, confirming chemisorption mechanisms. The CuOGF catalyst demonstrated superior performance, efficiently generating reactive oxygen species (ROS) through Fenton-like reactions with H₂O₂ and CH₃COOH. Optimal conditions at neutral pH, 35 °C, 0.015 g CuOGF, 100 mg/L H₂O₂, and 100 mg/L CH₃COOH achieved a removal efficiency of 90.4 % within 45 min. Mechanisms of dye removal involved synergistic interactions such as π-π stacking, electrostatic interactions, and radical-driven oxidation. These findings underscore the potential of CuOG_F as a sustainable and efficient material for environmental remediation applications.

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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.