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Ozcan F.,Selcuk University | Ozcan F.,Advanced Technology Research and Application Center | Malkondu S.,Selcuk University | Kocak A.,Selcuk University | And 2 more authors.
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2013

The present study describes the synthesis of a novel extractant p-tert-butyl-calix[4]azacrown ionophore (5) and evaluation of its extraction capability toward dichromate ion from aqueous solution. At first, p-tert-butyl-calix[4]azacrown ionophore (5) has been synthesized from the condensation of p-tert-butyl-calix[4]arene diamine (3) with N-(4-formylphenyl)- aza-15-crown-5 (4). The studies regarding the removal of dichromate ion from the aqueous solutions have been carried out in the liquid-liquid extraction systems. The extraction results showed that p-tert-butyl-calix[4]azacrown derivative (5) exhibited generally higher affinity towards dichromate ion than both 3 and 4 at all studied pHs. © 2012 Springer Science+Business Media B.V. Source


Ozcan F.,Selcuk University | Ozcan F.,Advanced Technology Research and Application Center | Bayrakci M.,Karamanoglu Mehmetbey University | Ertul S.,Selcuk University
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry | Year: 2015

In this study, four new magnetite nanoparticle containing different chelating groups as ester, amide and azacrown moieties at the lower rim of calix[4]arenes were prepared by the reaction of formylated calix[4]arenes and amino propyl modified magnetite nanoparticles (APTMS-MN). All of the newly synthesized and prepared compounds were characterized by using different analytical techniques such as nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and thermogravimetric analyses (TGA). Furthermore, uranium binding abilities of newly prepared magnetite nanoparticles were evaluated by using solid-liquid phase extraction process and obtained results showed that magnetite nanoparticles containing picolinamide units exhibited superior and more efficient extraction percentage for uranium ions at lower pH values. Copyright © Taylor & Francis Group, LLC 2015. Source


Bayrakci M.,Karamanoglu Mehmetbey University | Ozcan F.,Selcuk University | Ozcan F.,Advanced Technology Research and Application Center | Ertul S.,Selcuk University
Tetrahedron | Year: 2015

Abstract This study reports the synthesis of three novel polyacrylonitrile (PAN) nanofibers based calixamide containing pyridine groups by electrospinning. The structures of the newly prepared nanofibers were clarified using spectroscopic techniques. Analysis indicated that preparation of nanofibers based calixamide was successfully achieved. The presence of calixarene molecules in the nanofiber backbones was confirmed by Fourier transform infrared (FTIR-ATR), scanning electron microscope (SEM), and thermogravimetric analyses (TGA and DSC). The toxic anion binding studies exhibited that the nanofiber-based calixamide could be efficiently used for the binding of chromate anions as a model toxic oxoanion. Nanofiber based calixamide may be a good candidate as a filter material for water purification and waste treatment owing to their very large surface area as well as the inclusion complexation capability of all surfaces associated with the calixarene skeleton. © 2015 Elsevier Ltd. All rights reserved. Source


Ozcan F.,Selcuk University | Ozcan F.,Advanced Technology Research and Application Center | Bayrakc M.,Karamanoglu Mehmetbey University | Ertul S.,Selcuk University
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2016

The objective of this study is to obtain nanofibrous precursor based calixarene with high ion adsorption capacity by electrospinning of blended solution of polyacrylonitrile (PAN) and upper rim functionalized calix[4]arene bearing N-methylglucamine (Calix-NMG). The obtained electrospun fibers were characterized using fourier transform infrared (FT-IR-ATR), scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectrometry (EDX) and thermogravimetric analyses (TGA and DSC). Analysis indicated that preparation of nanofibers based Calix-NMG was successfully achieved. The ion binding studies exhibited that the nanofiber based Calix-NMG could be efficiently used for the binding of chromate anions and uranium cations. Nanofiber based calix[4]arene with N-methylglucamine chelating groups may be a good candidate as a filter material for treatment of a large quantity of wastewater owing to their very large surface area as well as both the inclusion and donor–acceptor complexation capability of all surfaces associated with the calixarene skeleton. © 2016, Springer Science+Business Media Dordrecht. Source


Naz S.,Selcuk University | Naz S.,University of Konya | Naz S.,University of Sindh | Kara H.,Selcuk University | And 6 more authors.
RSC Advances | Year: 2014

A novel alginic acid derived tin catalyst, tin alginate (Sn-Alg), was successfully synthesized, characterized and applied for methyl esterification. Initially, the amount of catalyst, methanol to fatty acid ratio and reaction time were optimized using an oleic acid standard for esterification. The optimal reaction conditions were found to be 4% catalyst, 1:12 oleic acid to methanol mole ratio and 2 h reaction time with 98.7% fatty acid methyl ester recovery. The capability of Sn-Alg beads to esterify the fatty acids of corn deodorizer distillate was evaluated. High recovery (97.6%) of esters was obtained after 8 cycles using reprocessed catalyst under the optimized parameters. The results of the present study indicated that based on the environmental pollution, reusability, avoiding the use of potassium or sodium hydroxides or sulphuric or phosphoric acids, and ease of catalyst separation, the solid Sn-Alg catalyst has a great potential for biodiesel production from highly free fatty acid deodorizer distillates. This journal is © the Partner Organisations 2014. Source

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