Novel chitosan-functionalized samarium-doped cobalt ferrite for adsorptive removal of anionic dye from aqueous solutions

Abstract

The spinel ferrite CoFe 1.98 Sm 0.02 O 4 , prepared by solegel 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 crosslinking with ECH were demonstrated by infrared spectroscopy. The developed material (CoFe 1.98 Sm 0.02 O 4 @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.

Chitosan-Sulfated Titania Composite Membranes with Potential Applications in Fuel Cell: Influence of Cross-Linker Nature

“…Apart from the absorption band at 1633 cm −1 (deformation vibration, adsorbed water) and of a broad band in the range of 879-409 cm −1 (Ti-O), in the spectrum of TS, the presence of four other absorption bands between 1243 and 967 cm −1 (1243 and 1141 cm −1 , asymmetric and symmetric stretching vibrations of S=O groups; 1055 cm −1 and 967 bands, asymmetric and symmetric stretching vibrations of S-O units) confirms the sulfating process and indicates a bidentate coordination of sulfate groups to Ti atoms, as previously stated [13,21]. For CS sample the characteristic absorption bands appear in the range 4000-800 cm −1 [22]. Thus, broad bands between 3500-3100 cm −1 (O-H and N-H stretching vibration) are visible in the CS spectrum, while asymmetric and symmetric stretching vibrations of C-H groups are located at 2922 and 2872 cm −1 , respectively.…”

“…Modified FTIR spectra as compared to those of the pristine TS and CS components are observed For CS sample the characteristic absorption bands appear in the range 4000-800 cm −1 [22]. Thus, broad bands between 3500-3100 cm −1 (O-H and N-H stretching vibration) are visible in the CS spectrum, while asymmetric and symmetric stretching vibrations of C-H groups are located at 2922 and 2872 cm −1 , respectively.…”

Thermal Stability, Kinetic Degradation and Lifetime Prediction of Chitosan Schiff Bases Derived from Aromatic Aldehydes

“…Due to its excellent characteristics, such as non-toxicity, biodegradability and biocompatibility, chitosan has increasingly been used in diverse fields such as biomedical, environmental protection, agriculture, functional food, wastewater purification and biotechnology. [1][2][3][4][5][6] It is easily obtained by the deacetylation of chitin, the second abundant biopolymer found on the earth obtained from shells of crustaceans such as crab, shrimp and insects. [2,7,8] The process extraction of chitin is realized in two steps, deproteinization followed by demineralization.…”

Facile Synthesis of Cobalt Ferrite (CoFe2O4) Nanoparticles in the Presence of Sodium Bis (2-ethyl-hexyl) Sulfosuccinate and Their Application in Dyes Removal from Single and Binary Aqueous Solutions

“…The main advantage of these types of materials is the ease of their separation from the treated water after the process of retaining pollutants by a simple application of an external magnetic field. Consequently, numerous studies have been devoted to assessing the use of diverse types of magnetic nanoparticles, such as ferrites (MFe 2 O 4 , M=Co, Ni, Mn, Fe, Mg, Ca, Zn) and their functionalized derivatives for dye removal and recovery [39][40][41][42][43][44][45][46]. The interesting properties of cobalt ferrite, such as physical/chemical stability, mechanical hardness, and the possibility to be easily separated/recovered from the treated water by applying a magnetic field, have led to numerous studies on the use of this material in the retention of pollutants in wastewater [39].…”