New Smart Magnetic Ionic Liquid Nanocomposites Based on Chemically Bonded Imidazole Silica for Water Treatment

New magnetic silica imidazolium ionic liquid nanocomposites were synthesized by a sol-gel technique. The (3-aminopropyl)triethoxysilane (APTS) was condensed with glyoxal and p-hydroxybenzaldehyde in acetic acid to produce an amino-modified silica ionic liquid (Si-IIL). The APTS was condensed with TEOS in ethanol and water to prepare amino-modified SiO₂ nanoparticles. The produced amino-modified SiO₂ silica was condensed with glyoxal and p-hydroxybenzaldehyde in acetic acid to produce chemically bonded silica SiO₂-IIL. The SiO₂-IIL and Si-IIL were used as capping agents during and after the formation of magnetite nanoparticles in ammonia to produce magnetic SiO₂-IIL-Fe₃O₄ and Fe₃O₄-Si-IIL adsorbents, respectively. Their chemical structure, morphology, crystalline lattice structure, surface charges, particle sizes, and magnetic characteristics elucidated the formation of core-shell and highly dispersed magnetic nanocomposites. The saturation magnetization values of Fe₃O₄-Si-IIL and SiO₂-IIL-Fe₃O₄ were 35.3 and 30.8, respectively. The uniform dispersed disconnected spherical morphologies appeared for Fe₃O₄-Si-IIL hybrid and the core-shell spherical morphology obtained with SiO₂-IIL-Fe₃O₄ hybrid NPs. The Fe₃O₄-Si-IIL and SiO₂-IIL-Fe₃O₄ show an excellent high chemical adsorption capacities as 460.3 and 300.9 mg·g^-1, respectively (not reported in the literature) when used as an adsorbent to remove CB-R250 water pollutant under optimum conditions. Their applicability and reusability as fast and highly effective adsorbents for Coomassie blue (CB-R250) organic water pollutants were investigated.