Efficiency of magnetite decorated with carbon quantum dot nanocomposites for the adsorptive removal of methylene blue from wastewater: Kinetic and modeling studies

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Liquids Pub Date : 2025-02-10 DOI:10.1016/j.molliq.2025.127128

Sanae El Ghacham , Youssef Aoulad El Hadj Ali , Lamia Hejji , Nouha El Mail , Abdelmonaim Azzouz , Anas Chraka , Luis Pérez-Villarejo , Pedro J. Sánchez-Soto , Badredine Souhail , Christian Sonne

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Abstract

In this study, a green and straightforward hydrothermal approach was employed to synthesize magnetite decorated with carbon quantum dots (Fe₃O₄@CQDs) nanocomposites for the effective removal of excess methylene blue (MB) from contaminated water. The textural and chemical proprieties of the Fe₃O₄@CQDs nanocomposites were comprehensively characterized using various techniques, including FTIR, XRD, SEM, UV–visible, and nitrogen adsorption–desorption analysis. Batch experiments were conducted to optimize process parameters, such as contact time, initial concentration, adsorbent dosage, initial pH, and temperature. The maximum monolayer adsorption capacity was found to be 83.51 mg/g within 45 min. Isotherm and kinetic studies indicated that the adsorption process followed Langmuir and pseudo-second-order models. Detailed analysis revealed that the adsorption mechanism of MB onto Fe₃O₄@CQDs nanocomposites involves hydrogen bonding, electrostatic interactions, and chemical binding between the adsorbent and adsorbate. The reusability of Fe₃O₄@CQDs was assessed, showing no significant decline in adsorption capacity over four regeneration cycles. These findings highlight the remarkable potential of Fe₃O₄@CQDs nanocomposites as efficient adsorbents for dyes removal and provide valuable insights for developing advanced strategies to eliminate cationic dye pollutants from wastewater.

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.