Journal
CHEMICAL ENGINEERING JOURNAL
Volume 452, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.139557
Keywords
Magnetic chitosan; Covalent organic framework; Adsorption; Diclofenac sodium; Pseudo -second -order; Langmuir isotherm
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In this study, magnetic chitosan-coated triazine-based covalent organic frameworks were successfully fabricated and used for the removal of diclofenac sodium. The bio-adsorbent exhibited a nanoporous structure with a large specific surface area and excellent adsorption capacity, showing potential for practical applications.
In the current research for the first time, the new magnetic chitosan-coated triazine-based covalent organic frameworks (CS/Fe3O4@TCOFs) were fabricated relying on the unique characteristics of chitosan (CS) and used for the adsorptive removal of diclofenac sodium (DS). The bio-adsorbent was studied by common characterization techniques. The calculated magnetic saturation (Ms 34.49 emu/g) revealed that the CS/Fe3O4@TCOFs can be easily separated by an external magnetic field. More importantly, it displayed a nanoporous structure with about 846.87 m2/g specific surface area in BET analysis. The maximum DS adsorption capacity was calculated at about 333.33 mg/g at 25 degrees C (pH 5) in the initial 50 mg/L concentration. The adsorption data were well fitted with the pseudo-second-order kinetics model, R2 0.9986, and also the Langmuir isotherm thermodynamic model, R2 0.9898. Additionally, the CS/Fe3O4@TCOFs showed excellent adsorption capacity after six times regeneration. These initial findings are expected to inspire further design and fabrication of effective bio-adsorbents for promising practical applications.
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