Sara Rahnama, Shahab Shariati* and Fatan Divsar Pages 1 - 11 ( 11 )
In this research, a novel magnetite titanium dioxide nanocomposite functionalized by amine groups (Fe3O4@SiO2@TiO2-NH2) was synthesized and its ability for efficient removal of Acid Fuchsine (AF) as an anionic dye from aqueous solutions was investigated. For this aim, the core-shell structure of Fe3O4@SiO2@TiO2 was prepared using Fe3O4 as a magnetic core, tetraethyl orthosilicate as silica and tetra butyl titanate as titanium sources for shell. The synthesized nanocomposites (particle size lower than 44 nm) were characterized by FT-IR, XRD, DRS, SEM and TGA instruments. The various experimental parameters affecting dye removal efficiency were investigated and optimized using Taguchi fractional factorial design. The synthesized adsorbent showed the highest removal efficiency of AF (99 %) at pH= 3.5, without salt addition and during stirring at contact times less than 10 minutes. The study of kinetic models at two concentration levels showed the fast dye sorption on the surface of the proposed nanocomposites with pseudo second order kinetic model (R2=1). Also, the fitting of AF sorption data to Freundlich, Langmuir and Temkin isotherms suggested that Freundlich model gave a better fitting than other models (R2=0.9936). Good chemical stability, excellent magnetic properties, very fast adsorption kinetics and high removal efficiency make the synthesized nanocomposite as a properly recoverable sorbent for removal of AF dye from wastewaters.
Acid Fuchsine, Titanium dioxide, Amine group, Nanomesopore, Adsorption, Magnetite
Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Department of Chemistry, Payame Noor University (PNU), Tehran