Adsorption removal of tartrazine by chitosan/polyaniline composite: Kinetics and equilibrium studies

International Journal of Biological Macromolecules
Sousna Sahnoun, Mokhtar Boutahala

Abstract

The present work focused on the performance of chitosan/polyaniline (Cht-PANI) composite for removing tartrazine dye from aqueous solutions. The adsorbent was characterized using SEM, XRD, FTIR, and TGA/DTA techniques. The effects of pH, initial dye concentration, contact time, and temperature on azo dye removal were studied. The kinetics and isotherm of tartrazine removal follow pseudo-second-order kinetics and the Freundlich isotherm, respectively. The Langmiur isotherm model exhibted a maximum adsorption capacity of 584.0 mg/g. The thermodynamic parameters were calculated and the negative values of ΔG° and positive value of ΔH° indicate that the adsorption processes are spontaneous and endothermic in nature. In addition, the resulting adsorbent reusability was demonstrated over four cycles, indicating that the Cht-PANI is a very promising adsorbent for removal of toxic pollutants from aqueous solutions.

Citations

Jan 7, 2019·Environmental Science and Pollution Research International·Abu Nasar, Fouzia Mashkoor
Oct 16, 2019·TheScientificWorldJournal·Ronald A Otavo-LoaizaGloria I Giraldo-Gómez
May 1, 2021·International Journal of Biological Macromolecules·Nahal ArameshMuhammad Bilal

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