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<p>An environmental problem present in water is the discharge of synthetic dyes. Adsorption is a method that provides excellent results for the removal of dyes, using chitosan as adsorbent agent; in this work, the effect of the thickness of chitosan films on the adsorption capacity of yellow dye No. 5 was evaluated. Two different thicknesses of 0.32 and 0.39&#xa0;mm were synthesized and the best results obtained were for the film with a thickness of 0.32&#xa0;mm, reaching an adsorption capacity of 790&#xa0;mg/g, at a pH of 2.5. The best fit for kinetics data was given in the pseudo-first order model, indicating a possible physisorption, and with the equilibrium data was the Sips model with the best fit, suggesting that the sorption process involves an interaction that occurs by monolayers through a heterogeneous surface material, reaching a higher saturation at values close to 780&#xa0;mg/g.</p> Graphical abstract <p></p>

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Evaluation of the effect of chitosan-based film thickness on the adsorption of tartrazine (yellow No. 5)

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Daniel Ayala-Gutierrez,
  • Rosa Elvira Zavala-Arce,
  • Alfredo Garcia-Gonzalez

摘要

An environmental problem present in water is the discharge of synthetic dyes. Adsorption is a method that provides excellent results for the removal of dyes, using chitosan as adsorbent agent; in this work, the effect of the thickness of chitosan films on the adsorption capacity of yellow dye No. 5 was evaluated. Two different thicknesses of 0.32 and 0.39 mm were synthesized and the best results obtained were for the film with a thickness of 0.32 mm, reaching an adsorption capacity of 790 mg/g, at a pH of 2.5. The best fit for kinetics data was given in the pseudo-first order model, indicating a possible physisorption, and with the equilibrium data was the Sips model with the best fit, suggesting that the sorption process involves an interaction that occurs by monolayers through a heterogeneous surface material, reaching a higher saturation at values close to 780 mg/g.

Graphical abstract