Abstract

Magnetic nanocomposites of nickel ferrite nanoparticles uniformly dispersed in the silica matrix have been synthesized successfully by a sol-gel process using tetraethyl orthosilicate (TEOS) and metallic nitrates as precursors. NiFe 2 O 4 @SiO 2 @HKUST-1 core-shell magnetic microspheres were synthesized and characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), vibrating sample magnetometry (VSM), nitrogen adsorption porosimetry, Thermal Analysis (TGA), photoluminescence analysis and UV-visible. at the more acidic pHs and the lower concentration of the dye solution, the less the dye molecule in the solution so pore volumes and surface areas will be filled in a longer time and their removal efficiency will be higher. Ternary magnetic nanocomposites of metal-organic, ferrite-nickel and silica frameworks have high efficiency and absorbability for cationic dyes such as methylene blue. As an optimum condition, magnetic metal-organic framework nanocomposite 30% NiFe 2 O 4 @SiO 2 @HKUST-1 within 60 minutes approximately 98% of dye removal was observed. Adsorption isotherms, kinetics and adsorption study shown R 2 is the most frequent Freundlich isotherm, which means that the adsorption process was mostly multilayered on heterogeneous surfaces of the metal-organic framework nanocomposites.