Abstract
Purpose
The discharge of colored effluents from industries is an important environmental issue and it is indispensable to remove the dyes before the water gets back to the rivers. The magnetic adsorbents present the advantage of being easily separated from the aqueous system after adsorption by positioning an external magnetic field.
Methods
Magnetic N-lauryl chitosan (L-Cht/γ-Fe2O3) particles were prepared and characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy, and vibrating sample magnetometry. Remazol Red 198 (RR198) was used as a reactive dye model for adsorption on L-Cht/γ-Fe2O3. The adsorption isotherms were performed at 25°C, 35°C, 45°C, and 55°C and the process was optimized using a 23 factorial design (analyzed factors: pH, ionic strength, and temperature). The desorption and regeneration studies were performed in a three times cycle.
Results
The characterization of the material indicated that the magnetic particles were introduced into the polymeric matrix. The pseudo-second order was the best model for explaining the kinetics and the Langmuir–Freundlich was the best-fitted isotherm model. At room temperature, the maximum adsorption capacity was 267 mg g−1. The material can be reused, but with a decrease in the amount of adsorbed dye.
Conclusions
L-Cht/γ-Fe2O3 is a promising material to remove RR198 and probably other similar reactive dyes from aqueous effluents.
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Acknowledgments
This work was supported by grants from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Pró-Reitoria de Pesquisa, Pós-graduação, Extensão e Cultura da Universidade do Vale do Itajaí (ProPPEC/UNIVALI).
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Debrassi, A., Baccarin, T., Demarchi, C.A. et al. Adsorption of Remazol Red 198 onto magnetic N-lauryl chitosan particles: equilibrium, kinetics, reuse and factorial design. Environ Sci Pollut Res 19, 1594–1604 (2012). https://doi.org/10.1007/s11356-011-0662-6
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DOI: https://doi.org/10.1007/s11356-011-0662-6