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Öğe Diffusion of amines through polysulfonated ion-exchange membranes(MARCEL DEKKER INC, 1997) Ersoz, M; Keles, A; Yildiz, SThe permeabilities and diffusion behaviors of aniline, p-chloroaniline, and p-nitroaniline were investigated in polysulfonated ICE-450 ion-exchange membranes as a function of pH at 25 degrees C. The permeabilities for these compounds increased with decreasing of receiver side pH. The modes of membrane/solution distribution and diffusion of amines, as a controlling factor to the membrane permselectivity in terms of basicity value, molecular size, and electrophilic groups of amines, were correlated consistently with the flux data as well as with the estimated membrane permselectivity parameters. The transport system depends on the basicity values of amines, and the pH gradients were the main driving force. It is shown that the diffusion parameters measured on single component experiments provide a good prediction of behavior.Öğe The effect of chelating agent on the separation of Fe(III) and Ti(IV) from binary mixture solution by canon-exchange membrane(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2005) Kir, E; Cengeloglu, Y; Ersoz, MThe competitive transport of Fe(III) and Ti(IV) ions and the effect of chelating agents on separation from binary mixture solutions through charged polysulfone cation-exchange membrane (SA(3)S) has been studied under Donnan dialysis conditions. The amount of chelating agent was taken as an equimolar of Fe(III) ion in the feed phase. In this process, the membrane separated two electrolyte solutions: the feed solution, initially containing metal salts (Fe, Ti), or metal salts solution, containing a chelating agent, and the other side (receiver solution) being HCl solution. An external potential field is not applied. It was observed that the chelating agents affect the metal transport; the transport of Fe(III) is decreased and the transport of Ti(IV) is increased. (c) 2005 Elsevier Inc. All rights reserved.Öğe Fluoride removal by Donnan dialysis with anion exchange membranes(ELSEVIER SCIENCE BV, 2005) Durmaz, F; Kara, H; Cengeloglu, Y; Ersoz, MThe removal of fluoride from diluted solution with Neosepta AHA anion exchange membrane has been studied by Donnan dialysis. The effects of concentration, pH, and accompanying anion on feed phase and receiving phase composition were investigated. Neosepta AHA anion exchange membrane was used for the removal of fluoride and the flux of fluoride with respect to the concentration, pH, and the effect of the counter-ions (HCO3-, Cl-, SO4-2) were obtained between 34-136.10(-7) (m.mol.cm(-2).s(-1)). The effect of the fluoride flux increased with increasing of concentration on the feed phase. The flux of fluoride was found to be higher at higher pH in the feed phase. In addition, the accompanying counter-anions also influenced the flux of fluoride and the order of flux was founded as HCO3-> Cl-> SO4-2. The results obtained for AHA membrane were compared with Neosepta AFN and polysulfone SB-6407 membranes. The transport efficiencies of the membranes were found to be in the order AFN > AHA > SB-6407.Öğe Influence of chelating agents on the recovery of Al(III), Fe(III), Ti(IV) and Na(I) from red mud by cation exchange membranes(TAYLOR & FRANCIS INC, 2006) Kr, E; Cengeloglu, Y; Ersoz, MThe metal recovery from red mud solution containing chelating agents such as nitriloacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), citric acid, and phosphoric acid were studied by using the Neosepta CMX and CMB cation exchange membranes in Donnan dialysis process. The stripping solution was 1.0 M HCl solution and no external potential field is applied. The efficiency of chelating agents on the recovery of metal ions through membranes was correlated with the flux data. It was observed that the removal and fluxes of metals were enhanced with citrate, EDTA and NTA chelating agents in contrast were decreased with phosphate complexing agent.Öğe Investigation of the properties of oil at the bleaching unit of an oil refinery(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2004) Kaynak, G; Ersoz, M; Kara, HColor removal from neutralized Sunflower oil was studied with different kinds of commercial bleaching earths. The effect of changes in time (25 and 35 min), temperature (80-125 degreesC), and bleaching earth dosage (0.1-0.9% by weight) on color, chlorophyll and carotene concentrations, and oxidation degree were investigated. To obtain adsorption Curves from coloring compounds adsorbed onto activated bleaching earths, the Langmuir and Freundlich equations was used, the constant parameters and correlation coefficient R were calculated for each type of bleaching earth, and color changes were explained by both adsorption isotherms. It was observed that an increase in bleaching earth dosage decreases color. Its effect oil oxidation state, however, is complex and related to both primary and secondary oxidation products. In addition, ail increase in temperature seems to decrease chlorophyll and carotene adsorptions. Generally, time beyond equilibrium is considered useless for the removal of unwanted components. This Study also confirms this claim and reveals that the pet-oxide value does not indicate the oxidation state of the oil completely. (C) 2004 Elsevier Inc. All rights reserved.Öğe Ion exchange equilibria of heavy metals in aqueous solution on new chelating resins of sporopollenin (vol 24, pg 195, 1995)(ELSEVIER SCIENCE BV, 1995) Ersoz, M; Pehlivan, E; Duncan, HJ; Yildiz, S; Pehlivan, M[Abstract not Available]Öğe Recovery and concentration of metals from red mud by Donnan dialysis(ELSEVIER SCIENCE BV, 2003) Cengeloglu, Y; Kir, E; Ersoz, M; Buyukerkek, T; Gezgin, SThe transport fluxes of Al(III), Fe(III), Ti(IV) and Na(I) ions from red mud through charged heterogeneous and Neosepta CMB and CMX cation exchange membranes has been studied as a function of H+ ion concentration in stripping phase. In this process, the feed solutions is initially red mud aqueous solution or half-diluted solution which contains Al(III), Fe(III), Ti(IV) and Na(I) ions and other side is HCl solutions at different concentrations (0.05, 1.0 M). It was shown that the fluxes and recovery factor value of metal ions were enhanced with increasing concentration in feed phase and H+ ion concentration in stripping phase. (C) 2003 Elsevier B.V. All rights reserved.Öğe Simultaneous recovery of Cr(III) and Cr(VI) from the aqueous phase with ion-exchange membranes(ELSEVIER SCIENCE BV, 2005) Tor, A; Buyukerkek, T; Cengeloglu, Y; Ersoz, MThe simultaneous recovery of trivalent and tetravalent chromium ions through charged ion-exchange membranes by using three detachable cells was tested at different current densities. The effect of mono- and divalent valence ions corresponding to trivalent and hexavalent chromium ions in the feed phase was investigated. The recovery factor values of chromium (III) and (VI) ion without current density were obtained and found that it was higher in the absence of binary monovalent and divalent ions, but increased with increasing current density and decreased in the presence of the binary mono- and divalent ions. The transport of both oxidation states of chromium ions through membranes was also correlated with the flux data.Öğe Transport of chromium through cation-exchange membranes by Donnan dialysis in the presence of some metals of different valences(ELSEVIER SCIENCE BV, 2004) Tor, A; Cengeloglu, Y; Ersoz, M; Arslan, GThe transport of a trivalent chromium ion through charged polysulfonated cation-exchange membranes in the presence of metals of different valences under Donnan dialysis conditions was studied as a function of pH gradient at 25degreesC. The recovery factor (RF) values of chromium ion were obtained, and it was found that the RF values decreased with the increasing of the metal valence. The transport of chromium ions through membranes was correlated with the flux data, which depended on the metal valences as well as the structure of the membrane. It was observed that the transport was influenced with H+ ion concentration in the receiver phase.Öğe Transport of hexavalent chromium through anion-exchange membranes(ELSEVIER SCIENCE BV, 2003) Cengeloglu, Y; Tor, A; Kir, E; Ersoz, MThis papers deals with the transport of hexavalent chromium through SB-6407, AFN and ACM anion-exchange membranes in contact with different salt solutions. The effect of salt solutions on the transport of chromium(VI) was investigated. The effect of salt solutions was observed at different sequences and the transport efficiencies of the membranes was found to be in the order SB-6407>AFN>ACM. The transport was found to be highest in a single state.
