Adsorptive performance of aminonaphthalenesulfonic acid modified magnetic-graphene oxide for methylene blue dye: Mechanism, isotherm and thermodynamic studies

• Published in: Inorganic chemistry communications Vol. 147; p. 110261
• Main Authors: Hotan Alsohaimi, Ibrahim, Alhumaimess, Mosaed S., Abdullah Alqadami, Ayoub, Tharwi Alshammari, Gharbi, Fawzy Al-Olaimi, Rawan, Abdeltawab, Ahmed A., El-Sayed, Mohamed Y., Hassan, Hassan M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2023
• Subjects: Adsorption; In situ co-precipitation; Magnetic nanocomposites; MB dye removal; Magnetic nanocomposites; Adsorption; MB dye removal; In situ co-precipitation
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2022.110261

[Display omitted] •Fe3O4@GO@AHSA was synthesized via in situ co-precipitation process and amidation reaction.•Fe3O4@GO@AHSA adsorbed MB by electrostatic interactions, π-π interactions, and Hydrogen bonding.•Fe3O4@GO@AHSA exhibited efficient adsorption for MB (286.4 mg/g at 298 K).•Fe3O4@GO@AHSA can be magnetically isolated from aqueous solutions.•Fe3O4@GO@AHSA can be regenerated and reused up to the fourth cycle successfully. In this research, a new aminonaphthalenesulfonic acid modified magnetic-graphene oxide (Fe3O4@GO@AHSA) was fabricated via in situ co-precipitation process followed by a covalent functionalization of Fe3O4@GO with aminonaphthalenesulfonic acid (AHSA) via amidation reaction. Fe3O4@GO@AHSA was featured by Zeta potential, FTIR, SEM, XRD, and TGA, then utilized in methylene blue (MB) adsorption from an aquatic media. The optimum removal efficiency of Fe3O4@GO@AHSA was assessed by batch method at different variables such as adsorbent dose (0.01–0.05 g), pH (2–8), adsorption time (1–1440 min), initial concentration of MB (25–300 mg/L), and temperature (25–45 °C). Accordingly, 0.03 g Fe3O4@GO@AHSA dose, pH: 7, contact time: 240 min at 25 °C were found to be the best optimal conditions, and a maximum experimental adsorption capacity of Fe3O4@GO@AHSA toward was 220.1 mg/g. Three nonlinear isotherm and kinetic models were utilized to assess the equilibrium experimental adsorption data. The findings show that the removal performance fits a Longmire isotherm and pseudo-second-order kinetic models. Besides, the result revealed that the maximum monolayer adsorption of MB on Fe3O4@GO@AHSA was 286.4 m/g. Based on thermodynamic results, the MB adsorption on Fe3O4@GO@AHSA nanocomposite was exothermic and a feasible process. The reusability tests displayed that the Fe3O4@GO@AHSA nanocomposite can be regenerated and reused up to the fourth cycle successfully for the uptake of MB pigment. Finally, this research indicates that the Fe3O4@GO@AHSA nanocomposite has a robust adsorption performance for MB dye from an aqueous medium.