synthesis
Synthesis of 1-(Furan-2-yl) imine Functionalized Silica as a Chelating Sorbent and its Preliminary Use in Metal Ion Adsorption
Wed, 2015-01-14 10:15 — Shehdeh JodehA 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.
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Synthesis of 1-(Furan-2-yl) imine Functionalized Silica as a Chelating Sorbent and its Preliminary Use in Metal Ion Adsorption
Tue, 2015-01-13 15:02 — Ismail WaradA 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.
Sulfur Nanoparticles: Synthesis, Characterizations and their Applications
Wed, 2013-09-18 22:59 — Ismail Warad
Synthesis of Selective β-lactam Derivatives
Thu, 2013-02-14 22:00 — Iyad AliIn this work, the mild conditions of Mitsunobu reaction were used to convert the hydroxyl group of 6-triphenylmethylaminopenicillanyl alcohol to amines by using different nuleophiles such as phthalimide, di-tert-butyliminodicarboxylate and potassium cyanate. The existence of the β-lactam carbonyl group increased the instability towards nucleophilic attack of refluxing methanol and the four-membered ring was opened. Treating 3-Di-tert-Butoxycarbonylaminomethyl-6-triphenylmethylamino - penicillanate with 50% trifluoroacetic acid in dichloromethane, resulted in the cleavage of triphenylmethyl group and one tert-butyl group. While the removal of both triphenylmethyl groups as well as di-tert-butylamino carbonyl group occurred when 75% trifluoroacetic acid was used. The significance of this study is to synthesize β-lactam derivatives that might to be more resistant to degradation by β-lactamase and hence, therapeutically more effective.
