Synthesis, Characterization, and Adsorption Studies of Functionalized Graphene Oxide via Covalent Interactions
نویسندگان
1 Department of Chemistry, Payame Noor University (PNU) of Mashhad, Mashhad, Iran
2 Young Researchers and Elites Club, Ardabil Branch, Islamic Azad University, Ardabil, Iran
3 Department of Chemistry, Payame Noor University (PNU) of Tehran, Tehran, Iran
doi
10.48309/chemm.2025.512176.1916چکیده
In this study, graphene oxide (GO) was functionalized with several organic compounds, including 3-aminopropyltriethoxysilane (APTES), dichloro-substituted PEG600 (DCPEG), and 3,4-dihydro-5-ethoxycarbonyl-4-(3-hydroxyphenyl)-6-methyl-pyrimidine-2(1H)-one. The modified GO was then analyzed using various characterization techniques such as Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), UV-Visible spectrophotometry (UV-Vis), and X-ray diffraction (XRD). Notably, the modified GO demonstrated excellent performance in adsorbing Reactive Red 239 (RR239) dye from water. The highest removal efficiency of 99.25% was achieved at a pH of 2, a contact time of 90 minutes, an adsorbent dosage of 2 mg, and an initial dye concentration of 20 g L⁻¹. Furthermore, the adsorption isotherm was evaluated using the Langmuir and Freundlich models. The results indicated that the Langmuir model best described the adsorption behavior of RR239, suggesting monolayer adsorption on the surface of the modified GO.
