Synthesis, Characterization and Applications of Sol-Gel Derived Zirconium Oxide Adsorbent Powder: Removal from Aqueous Solution of Phenol and p-Chlorophenol

Authors : Murat Akarsu

Pages : 477-486

View : 11 | Download : 6

Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :Adsorbent powders were prepared from the uncatalysed hydrolysis-condensation reactions of different complexes that were synthesized by the reactions of Zr(OPrn)4 with different chelating ligands (such as allylacetic acid [AAH], vinylacetic acid [VAH] and citraconic acid [CAH]). The complex products were characterized by FT-IR, 1H-NMR and 13C-NMR spectra. The maximum combination ratios of AAH/Zr(OPrn)4, VAH/Zr(OPrn)4 and CAH/Zr(OPrn)4 were 1.7, 0.9 and 1.3, respectively. The hydrolysis-condensation products of these complexes were calcinated at 900 °C and half of them were coated with 3-glycidyloxypropyltrimethoxysilane (GLYMO). The surface area and average pore diameter of the powders were estimated by the analysis of adsorption/desorption BET isotherm data. The adsorption capacities of these powders for aqueous phenol and p-chlorophenol were calculated following spectrophotometric determination. Phenol and p-chlorophenol adsorption on all of the GLYMO-coated adsorbents were satisfactory, e.g., the adsorbent obtained from the hydrolyzed, calcinated and GLYMO-coated form of Zr(OPrn)2.3(AA)1.7 adsorbed 63% of phenol while the uncoated form adsorbed only 10%. The adsorption isotherm has been determined and data have been analyzed according to the Freundlich model.
Keywords : adsorbent, adsorption, coating, sol-gel process, zirconium alkoxides.