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Abstract

This study investigated the adsorption of indigo carmine dye (a chemical considered to be a pollutant in water) onto chitosan nanocomposite grafted with methyl methacrylate (Ch-g-PMMA) polymer. Absorption values are found for solutions at different conditions of concentration, temperature, weight and acidity. The adsorption process was studied to choose the best weight of the compound from 0.01–0.07. It showed that the largest amount of dye adsorbed on the surface of the triple composite was at pH = 4. The results of the effect of ionic strength on the process of absorption of salts (sodium chloride, calcium carbonate) were also presented. It has been found that CaCO3 has greater solubility because it affects the amount of adsorbed material compared to NaCl salt. The results also showed that the adsorption kinetics study is pseudo-second order. Freundlich and Langmuir adsorption isotherms were used, and the results showed that the dye applied to the Freundlich isotherm. The kinetic results also showed that the adsorption of dyes follows pseudo-second order kinetics. It was found that the reaction is a thermal release of the dye solution through the negative value of the enthalpy function ΔH and that the adsorption process takes place automatically to remove the dye through the negative value of the free energy ΔG and the low randomness of the dye. The indigo carmine dye solution increases the negative value of the entropy function when the solid adsorbent interacts with the liquid adsorbent (dye) on the surface of the adsorbent.

Keywords

Adsorption, Crab shells, Chitin, Chitosan, Indigo carmine

Subject Area

Chemistry

Article Type

Article

First Page

781

Last Page

790

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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