Preparation, characterization, and adsorption studies of core@shell SiO2@CeO2 nanoparticles: a new candidate to remove Hg(II) from aqueous solutions

Authors : ALİ İMRAN VAİZOĞULLAR, AHMET BALCI, İBRAHİM KULA, MEHMET UĞURLU

Pages : 565-575

View : 8 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :SiO$_{2}$ supported core@shell nanoparticles insert ignore into journalissuearticles values(CSNs); have recently attracted great attention due to their unique, tunable, optical, photocatalytic, and higher adsorption properties. In this study, SiO$_{2}$@CeO$_{2}$~CSNs were synthesized using a chemical precipitation technique and characterized by Fourier transform infrared insert ignore into journalissuearticles values(FT-IR);, X-ray diffraction insert ignore into journalissuearticles values(XRD);, scanning electron microscope insert ignore into journalissuearticles values(SEM);, and transmission electron microscope insert ignore into journalissuearticles values(TEM); analysis. XRD analysis showed that SiO$_{2\, }$particles were the core while CeO$_{2}$ particles were the shell. It was seen as a new band at 961 cm$^{-1}$ of the oxygen bridge between Si and Ce atoms from FT-IR results; SiO$_{2}$ and CSNs were spherical insert ignore into journalissuearticles values(0.5--0.6 $\mu $m); from SEM and TEM analyses. Different parameters such as contact time, initial concentration, pH, and temperature were investigated. The optimum conditions for temperature, pH, and contact time were 25 $^{\circ}$C, 8.0, and 60 min, respectively. In addition, the equilibrium adsorption data were interpreted using Langmuir and Freundlich models to describe the uptake of Hginsert ignore into journalissuearticles values(II);. The Freundlich isotherm model insert ignore into journalissuearticles values(R$^{2}$: 0.99); fit better than Langmuir and the $q_{max} $value was 153.8 $\mu $g g$^{-1}$ at various concentrations insert ignore into journalissuearticles values(0.1--1 mg L$^{-1});$. The thermodynamic parameters were also calculated and, from these results, it can be shown that our synthesized particles can be used in water purification systems to remove Hginsert ignore into journalissuearticles values(II);.
Keywords : SiO 2 CeO 2, mercury, heavy toxic metal, core@shell, adsorption