Removal of Anionic Congo Red Dye from Aqueous Solutions by Ionic Liquid–Chitosan-Graphene Oxide composites

The objective of the present laboratory-experimental study was to remove congo red from industrial effluents using adsorption by graphene oxid that functionalized with chitosan and ionic liquid (GO/IL/Ch) [1-3]. Various parameters such as pH, different amounts of absorbent, different concentrations of congo red, contact time and temperature were examined. The highest congo red removal was achieved at pH=4. The amount of 0.004 grams of absorbent is optimum for removal of 50 ppm concentration of congo red. Equilibrium data and adsorption kinetics obtained from congo red were observed to obey the Langmuir isotherm and pseudo second-order kinetic models, respectively and also thermodynamic studies show that the adsorption processes are calefactive. The findings indicate that (GO/IL/Ch) is capable of removing congo red from industrial effluents.