화학공학소재연구정보센터
Materials Chemistry and Physics, Vol.226, 73-81, 2019
New magnetic silica-based hybrid organic-inorganic nanocomposite for the removal of lead(II) and nickel(II) ions from aqueous solutions
A novel magnetic sol-gel silica-based hybrid organic-inorganic adsorbent (MNPs@SiO2-TSD-TEOS) was synthesized by immobilizing silica (SiO2) shell on Fe3O4 magnetic nanoparticles (MNPs) prior to binding with hybrid organic-inorganic tetraethylorthosilicate (TEOS) and N-[3-(trimethoxysilyl)propyl]ethylenediamine (TSD)). The proposed material was characterized using Fourier transform infrared spectrometer (FTIR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscope (EDS) and X-ray diffraction (XRD). MNPs@SiO2-TSD-TEOS was applied as an adsorbent for the simultaneous adsorption of Pb(II) and Ni(R) ions from aqueous solutions. The adsorption process, reusability test and field application of MNPs@SiO2-TSD-TEOS were performed using batch adsorption of metal ions at pH 5. The adsorption process was well matched to type III isotherm model (multilayer sorption) set by IUPAC. The experimental adsorption data were well-fitted to the Freundlich adsorption isotherm since its coefficient of determination (R-2 = 0.997) is higher than that of the Langmuir isotherm (R-2 = 0.871). The adsorption kinetics were fitted well to pseudo-2nd-order model as compared to pseudo-1st-order. Furthermore, the results showed maximum adsorption capacities of 417 and 357 mg g(-1) for Pb(II) and Ni(II), respectively. Isotherm model (type III), Freundlich isotherm and pseudo-2nd-order model confirm a multilayer chemical/physical adsorption process.