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Chitosan-coated sand and its application in a fixed-bed column to remove dyes in simple, binary, and real systems

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Abstract

Adsorption of tartrazine yellow food dye, in a fixed-bed column, was carried out using a single system, a binary system (in the presence of sunset yellow food dye), and in a real effluent provides from an ice cream industry. Chitosan was used to coat sand particles by the dip-coating technique, and these particles were applied in fixed-bed adsorption. The assays were performed in flow rates of 3 mL min−1 and 5 mL min−1. The best performance was reached at 3 mL min−1. In this flow rate, for single and binary systems, the breakthrough time was 95 min and 65 min, and the maximum capacity of the column was around 595 mg g−1 and 497 mg g−1, respectively. In the assay conducted with the real effluent, the breakthrough time was 10 min, and the maximum adsorption capacity of the column was reduced to 191 mg g−1 for tartrazine dye. The dynamic models of Thomas and Yoon-Nelson were used, and both were suitable to represent the breakthrough curves.

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The authors would like to thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)/Brazil–Finance Code 001 and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)/Brazil for the financial support. The authors also would like to thank the projects DCIT 70/2015 and DCIT 77/2016 of the Secretaria de Desenvolvimento, Ciência e Tecnologia/RS/Brazil for the financial support.

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Correspondence to Tito Roberto Sant’Anna Cadaval Jr.

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Responsible Editor: Philippe Garrigues

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Camara, A.S., Lütke, S.F., Pinheiro, C.P. et al. Chitosan-coated sand and its application in a fixed-bed column to remove dyes in simple, binary, and real systems. Environ Sci Pollut Res 27, 37938–37945 (2020). https://doi.org/10.1007/s11356-020-09924-5

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  • DOI: https://doi.org/10.1007/s11356-020-09924-5

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