Act. Polymcriu 41 (1990) Nr. 9 504 cN/dtex I t 0.4 -1 k 0 3 -0 -l 0.2. / / i / / / EL-SAFTY, SEAABAN and MOUSTAFA: Polyesterification of 1,3-di(carboxymethoxy) benzene with tetraethylene glycol EL-SAFTY, SHAABAN and MOUSTAFA: Polyesterification of 1,3-di(carboxymethoxy)benzene with tetraethylene glycol Acta Polymerica 41 (1990) Mr. 9 505Polyveresterung von 1,3-Di(carboxymethoxy) benzen rnit Tetraethylenglycol Die Polyveresterung von 1,3-Di(carboxymethoxy) benzen mit Tetraethylenglycol wurde bei aquimolaren und nichtaquimolaren Verhaltnissen der Reaktanten im Temperaturbereich von 120 bis 160 O C ohne Katalysator sowie in Gegenwart von p-Toluensulfonsaure als Katalysator untersucht. Die experimentellen Ergebnisse der nichtkatalysierten Reaktion zeigen eine gute obereinstimmung mit der von FLORY vorgeschlagenen kinetischen Gleichung. Die Kinetik der saurekatalysierten Reaktion 1aSt sich besser mit der von LIN und HSIEH angegebenen kinetischen Gleichung beschreiben. Die Geschwindigkeitskonstanten und die Aktivierungsenergien der nichtkatalysierten und der saurekatalysierten Reaktion wurden berechnet.Iloauamepw$ u?cayua 1,3-~u(?cap6o~cuwemo~cu)6ex~ona mempa3munenznu?conent B3yqeHbI IIpO~eCC IIOJIH3TepP#MKaqHH ~,~-~H ( K~~~O K C H M~T~K C P )~~H~O J I~ TeTpa3THJIeHrJIllKOJIeM B YCJIOBPRX BKBH-MOJIRpHOrO H He3KBHMOJIRpHOl' O COOTHOlUeHHfi KOMIIOHeHTOB, B 0 6 n a c~a TeMlIepaTypbI OT 120 A0 160°C, 6e3 KPTBJIH-3aTOpa HJIP C n-TOJIyOJICyJIb~OHOBOfi KHCJIOTOfi B KaqeCTBe KaTaJIH3aTOpa. Pe3yJIbTaTbI, IIOJIyWHHbIe B OTCYTCTBHe KaTaJlU3aTOpa, XOpOlUO OIIHCblBaIOTCR KHHeTHqeCKHM ypaBHeHHeM DJIOPH, B TO BpeMR K a K KHHeTMKe PeaKqIlH B KOHCTaHT CKOPOCTH peaKqHfi B OTCyTCTBPe P B IIPPCYTCTBHH KaTaJIP3aTOpa, a TaKme COOTBeCTByIo~He 3Ha'IeHUR 3HeprHH aKTPBaqHH. IIPHCYTCTBHH ~a~a n~s a~o p a CooTBeTcTByeT B 60nbmefi m e n e m y p a m e m e JIHHA H Xcti3. BbIqkicneHbI ~H~Y~H M R

ChemInform Abstract (to yield benzoic acid; increase (decrease) in the first-order rate constant at water mol fractions > 0.5 (< 0.5); activation parameters, mechanism).

A N effective and facial method for removal of lead(II), copper(II) and Nickel(II) ions from aqueous solutions, is based on investigating a new modified graphene oxide, by appealing interaction between graphene oxide GO and 4-amino-2,3-dimethyl-1-phenyl-3-pyrazolin-5one(4-aminoantipyrine). The adsorbent is fully characterized by FT-IR, XRD, SEM, EDX, TEM, and Raman spectroscopy. The GO was prepared using a modified Hummers method by the reaction of potassium permanganate with graphite in presence of a mixture of sulfuric and phosphoric acids. This novel solid phase adsorbent 4-aminoantipyrine-GO was utilized to adsorb Pb(II), Cu(II) and Ni(II) ions from aqueous solutions because of amide functional group, is resulting an efficient adsorption. Also the abundant oxygen-containing functional groups on the surfaces of graphene oxide GO play an important role in metal ions sorption. The adsorption isotherms data were well fitted with Langmuir isotherm for Pb(II), Cu(II) and Freundlich isotherm for Ni(II) ions respectively. The kinetics of Pb(II), Cu(II) and Ni(II) ions adsorption were well fitted with pseudo second-order equation. The results of thermodynamic parameters referred to chemical adsorption. Also the positive values of standard heat of adsorption (ΔH o ) and negative values of (ΔG o ) indicated that the adsorption process was endothermic and spontaneous.A.F. SHAABAN et al. based substance, has attractive properties because it has high mechanical strength (more than 1060 GPa), large specific surface area (nearly 2600 m 2 /g), and riching in oxygenous functional groups (carboxyl, epoxy, and hydroxyl groups) [22][23][24][25]. GO is an efficient adsorbent for heavy metal ions [26][27][28][29], humic acid [30], radionuclides [31][32][33][34], organic dyes [35,36], ammonia [37]. due to its good dispersion in water, biocompatibility, and relatively easy and cost effective preparation methods [38,39]. Therefore, functionalization of GO with molecules containing strong chelating groups such as nitrogen and thiol can significantly enhance its removal efficiency [40][41][42][43].The present work aims to: (I) preparing of GO nano sheets by improved hummers method from graphite; (II) preparing of acylchloride of graphene oxide nano sheets GO-Cl; (III) functionalization of 4-aminoantipyrine onto GO-Cl for adsorption of Pb(II), Cu(II) and Ni(II) ions from aqueous solutions; (IV) Characterization of all the above synthesized substances by FT-IR, XRD, SEM with EDX, TEM, and Raman spectroscopy; (V) A study of Langmuir and Freundlich adsorption isotherms also the adsorption kinetics and thermodynamic parameters of Pb(II), Cu(II) and Ni(II) ions adsorption from aqueous solutions onto the new functionalized graphene oxide 4-aminoantipyrine-GO; (VI)Regeneration and recycling studies of loaded 4-aminoantipyrine -GO.