New Adsorbents from Ti(OPrn)4 by the Sol-Gel Process: Synthesis, Characterization and Application for Removing Some Heavy Metal Ions from Aqueous Solution

Authors : Funda SAYILKAN, Hikmet SAYILKAN

Pages : 27-38

View : 12 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :New adsorbents were synthesized by the sol-gel process from the product of a hydrolysis reaction and its coated form of titaniuminsert ignore into journalissuearticles values(IV);-n-propoxide for removing some heavy metal ions from aqueous solution. Titaniuminsert ignore into journalissuearticles values(IV);-n-propoxide was uncatalyst hydrolyzed with different amounts of water at room temperature and was found to react in a 1:1.6 ratio insert ignore into journalissuearticles values(mole of Ti:mole of H2O);. It was found that the condensation following the hydrolysis reaction was alcohol condensation. The hydrolysis-condensation product was characterized in detail by GC, Karl-Fischer coulometric titrator, NIR-spectroscopy, FT-IR spectroscopy, TG-DTA and elemental analysis. The hydrolysis-condensation product of titaniuminsert ignore into journalissuearticles values(IV);-n-propoxide was calcinated at 900 °C after drying at 100 °C and some of this product was coated with hydrolyzed NH2-functional silanes [3-insert ignore into journalissuearticles values(2-aminoethylamino);ethylamino);propyl-trimethoxy silane] insert ignore into journalissuearticles values(Amino-1);, and [3-insert ignore into journalissuearticles values(2-aminoethylamino);propylmethyldimetoxysilane] insert ignore into journalissuearticles values(Amino-2);, separately. Adsorption capacities of uncoated and NH2-functional silane coated hydrolysis-condensation products for Fe3+ , Cu2+ and Pb2+ ions in aqueous solution were investigated by FAAS. It was observed that the extent of adsorption was influenced significantly by the type and concentrations of coating materials, e.g., Amino-1 coated adsorbent prepared in methyl alcohol as 50% insert ignore into journalissuearticles values(w/w); and 100% insert ignore into journalissuearticles values(without methyl alcohol); adsorbed 90.67% and 100% of Fe3+ , respectively, while the uncoated form adsorbed only 5%. The adsorption isotherm was determined and the data were analyzed according to the Freundlich model.
Keywords : Sol gel process, adsorption, adsorbent, waste water, heavy metals, coating