Improving the co-removal efficiency of dyes from water by a novel four-component chitosan flexible film containing graphene oxide

Abstract

Abstract In the present study, a novel four-component flexible film based on α-ketoglutaric acid, chitosan, polyaniline, and graphene oxide (α-CTS-PANI-GO) was synthesized and characterized by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Raman spectroscopy. The simultaneous removal properties of α-CTS-PANI-GO were evaluated in the removal of cationic and anionic dyes, Methylene Blue (MB) and Acid Orange 7 (AO7). Using the Central Composite Decomposition (CCD), the effect of different variables such as pH, temperature, adsorbent dose, and time on AO7 and MB removal was studied. Various isotherm models, such as Langmuir and Freundlich, were investigated, and the processing of experimental equilibrium data confirmed the suitability and application of the Langmuir model. Analysis of experimental adsorption data using various kinetic models, such as quasi-first and second-order models, shows the applicability of the first-order equation. The results showed that in the optimal conditions, the removal percentage was about 95% for AO7 and 80% for MB, which indicates the successful performance of the synthetic film compared to the method.