Modification of Hydroxysodalite Nanoparticles by (3-aminopropyl)trimethoxysilane and Isatoic Anhydride as a Novel Composite for Efficient Sorption of Cu(II) Ions from Aqueous Media

In this study, (3-aminopropyl)trimethoxysilane (C 6 H 17 NO 3 Si) and isatoic anhydride (C 8 H 5 NO 3 ) reacted with hydroxysodalite nanoparticles (Na 4 Al 3 Si 3 O 12 (OH)) to produce a new composite with the purpose of effectively adsorbing Cu(II) ions from aqueous solutions. The composite effectively removes Cu(II) ions from aqueous solutions by chelating them via NH and NH 2 groups and adsorbing them through ion exchange with Na(I) ions. Besides, the synthesized composite can be regenerated and reused multiple times, making this approach cost-effective and environmentally friendly because of its ability to eliminate pollutants that threaten the environment efficiently many times over. The presence of a broad XRD peak at 2Ɵ = 25° and irregular shapes in the SEM analysis confirmed successful modification of hydroxysodalite with (3-aminopropyl)trimethoxysilane and isatoic anhydride. Additionally, the noticeable bands at 2850 and 3002 cm −1 in the FTIR spectrum confirmed this modification, corresponding to aliphatic and aromatic CH group stretching vibrations, respectively. Moreover, the adsorption of Cu(II) ions aligned well with the pseudo-second-order kinetic model and Langmuir equilibrium isotherm. The composite showed an impressive maximum sorption capacity of 174.83 mg/g for Cu(II) ions. Furthermore, the ΔH o value of −45.06 kJ/mol confirms the exothermic nature of Cu(II) ion sorption using the composite, indicating a chemical process.