Removal of Rhodamine B from Aqueous Solutions Using ‎ Chitosan-g-poly(acrylic acid)/2-(((1E,2E)-1,2-diphenyl-2-((4(E-1-(thiazol 2ylimino) ethyl) phenyl) imino) ethylidene) amino) phenol composite as an Adsorbent

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Document Type : Research Paper

Authors

Department of Chemistry, College of Education, University of Al-Qadisiyah, Diwaniyah, Iraq

Abstract

Based on the extensive research conducted, a composite, CS-g-PAA/DEAP, was developed and its physical and chemical properties were assessed. The composite's infrared spectroscopic profile depicted characteristic functional groups at specified frequency bands. Specific transformations in absorption bands demonstrated the composite's formation. Further changes upon Rh-B dye adsorption suggested significant interactions between the composite and the dye. Field Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) revealed altered surface characteristics of the composite after Schiff base integration, and distinct changes post-dye adsorption. Significant surface roughening, pore filling and particle agglomeration were noticed, indicating dye uptake. Thermogravimetric Analysis (TGA) revealed the thermal stability of the composite. Different decomposition stages were noticed at certain temperature ranges, suggesting the influence of nature of the monomers, crosslinking density, and functional groups on the thermal behavior of hydrogels. The effect of surface weight, pH, and temperature on dye adsorption was investigated. Adsorption decreased with increasing temperature, supporting the exothermic nature of the process. Also, a positive correlation between increased acidity and dye adsorption was observed. The thermodynamic functions suggested an exothermic and spontaneous adsorption process, with entropy reduction hinting at less randomness in adsorbed particles. Freundlich adsorption isotherm model was deemed suitable, indicating a multilayered, heterogeneous adsorption process. Further exploration of these properties would contribute to potential practical applications of the composite material.

Keywords

Journal of Nanostructures

Articles in Press, Accepted Manuscript
Available Online from 28 June 2023

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