Journal
COMPTES RENDUS CHIMIE
Volume 20, Issue 11-12, Pages 1026-1036Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2017.10.003
Keywords
Rare-earth-doped spinel ferrite; Chitosan; Adsorption kinetics; Adsorption isotherm; Model-based optimization
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Funding
- grant of the Romanian National Authority for Scientific Research and Innovation, CNCS-UEFISCDI [PN-II-RU-TE-2014-4-1266]
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The spinel ferrite CoFe1.98Sm0.02O4, prepared by sol-gel autocombustion technique using maleic acid as combustion agent, was successfully functionalized with chitosan (CS) and epichlorohydrine (ECH). The insertion of the samarium cations into the spinel matrix was proved by X-ray diffraction and Fourier transform infrared analyses. Likewise, the specific magnetization value indicated supplementary evidence of the successful adaptation of rare-earth cations into the spinel structure. The functionalization with CS and the cross-linking with ECH were demonstrated by infrared spectroscopy. The developed material (CoFe1.98Sm0.02O4@CS-ECH) was applied as sorbent for the removal of anionic dye (Orange II) in the batch mode. Adsorption process was investigated by kinetics, equilibrium, and thermodynamic studies. The model-based optimization of the adsorption process was performed according to the response surface methodology to evaluate the influence of pH and sorbent dosage. The optimization yielded the maximum value of color removal efficiency of 96.31% using only 1.60 g/L adsorbent dosage at pH 5.2. (C) 2017 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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