An-Najah Staff

A new silica gel material covalently bonded with 1-(furan-2-yl) imine (SiNFn) was synthesized and well characterized by elemental analysis, FT-IR, 13C NMR of the solid state, nitrogen adsorption-desorption isotherm, BET surface area, B.J.H. pore sizes, thermogravimetry analyser (TGA) curves, and scanning electron microscope (SEM). The new chelating surface exhibits good chemical and thermal stability. The synthesized SiNFn was investigated as an adsorbent for removal of Cu(II), Zn(II), Cd(II) and Pb(II) from aqueous solution. The determination of metal ions was carried out on FAAS using batch method. The adsorption capacity was investigated using kinetics and pH effects. The preliminary results show that the new material present high adsorption toward copper compared to others described sorbents.

A new silica gel material covalently bonded with 1-(furan-2-yl) imine (SiNFn) was synthesized and well characterized by elemental analysis, FT-IR, 13C NMR of the solid state, nitrogen adsorption-desorption isotherm, BET surface area, B.J.H. pore sizes, thermogravimetry analyser (TGA) curves, and scanning electron microscope (SEM). The new chelating surface exhibits good chemical and thermal stability. The synthesized SiNFn was investigated as an adsorbent for removal of Cu(II), Zn(II), Cd(II) and Pb(II) from aqueous solution. The determination of metal ions was carried out on FAAS using batch method. The adsorption capacity was investigated using kinetics and pH effects. The preliminary results show that the new material present high adsorption toward copper compared to others described sorbents.

Tetra(4-pyridyl)porphyrinatomanganese(III), [Mn^III(TPyP)]⁺, has been covalently bonded to the surface of a chlorinated crosslinked poly(siloxane) which contains the immobilized chloropropyl group, -CH₂CH₂CH₂Cl. The metalloporphyrin complex was found to react with the immobilized ligand via a quaternization reaction of the 4-pyridine N-atom. The porphyrin binding involves a chemical process rather than physical adsorption. There is evidence that two porphyrins species coexist, both bonded to the surface, one being [Mn^III(TPyP)]⁺ and the other (H₂TPyP), both in the quaternary salt forms, when the quaternization reaction is carried out at higher temperature (150 °C). At moderate reaction temperatures (70–80 °C) the quaternization reaction resulted in only one species, supported [Mn^III(TPyP)]⁺, as evident from electronic spectra of the solid. Also, visible absorption spectra taken of the solution remaining after the quaternization reaction showed no demetallated porphyrm. Solid state electronic absorption, dispersive IR and FT-IR spectra have been used for confirmation.