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Öğe Adsorption Equilibria of L-(+)-Tartaric Acid onto Alumina(Amer Chemical Soc, 2009) Uslu, Hasan; Inci, IsmailThe adsorption equilibria of L-(+)-tartaric acid onto alumina from wastewaters of wineries were studied, and it has been found that the equilibrium adsorption fits the Langmuir and Freundlich isotherms. Adsorption experiments were carried out at three different temperatures (298, 310, and 325) K. The adsorption Of L-(+)tartaric acid is dependent on the acid concentration and the amount of alumina. The maximum percentage removal of L-(+)-tartaric acid was 22 % by alumina at 298 K. The Langmuir and Freundlich constants have been found to be 0.023 g.g(-1) and 0.014 (g.g(-1))/(L.g(-1))(-1/n), respectively, at 298 K. The thermodynamic parameters Delta H-ads(0) and Delta S-ads(0) for the adsorption of tartaric acid on alumina have been calculated to be -5.62 kJ.mol(-1) and 50.65 J.mol(-1).K-1, respectively.Öğe Adsorption Equilibrium Data for Acetic Acid and Glycolic Acid onto Amberlite IRA-67(Amer Chemical Soc, 2010) Uslu, Hasan; Inci, Ismail; Bayazit, Sahika SenaThe removal of acetic acid and glycolic acid from aqueous Solution by the weakly basic adsorbent Amberlite IRA-67 has been Studied at three different temperatures. Amberlite IRA-67 removed both acids very well from aqueous Solution. The maximum adsorption efficiency has been found to be 86.29% and 61.36% for glycolic acid and acetic acid, respectively. Langmuir and Freundlich adsorption isotherms have been applied to the experimental data. The Langmuir isotherm fitted the experimental data better than the Freundlich isotherm for both acids. Thermodynamic parameters Delta G, Delta H, and Delta S were calculated.Öğe Adsorption of Cu (II) ions from water by carbon nanotubes oxidized with UV-light and ultrasonication(Elsevier, 2014) Bayazit, Sahika Sena; Inci, IsmailThe copper ion adsorption from aqueous solutions on oxidized single-wall (SWCNTs) and multi-wall carbon nanotubes (MWCNTs) was investigated. Two different oxidation methods were used on the carbon nanotubes. One is ultrasonication of CNTs with concentrated HNO3, and the other is the oxidation of CNTs under UV-light with concentrated HNO3. The efficiencies of the oxidation methods were determined using Cu (II) adsorption. The adsorption parameters were examined, such as Cu (II) ion concentrations, pH, adsorption time, adsorbent quantities and temperature. The adsorption mechanism between the carbon nanotubes and Cu (II) ions was modeled using Langmuir and Freundlich isotherms, Pseudo-second order kinetic model, and Bangham and Elovich models. (C) 2014 Elsevier B.V. All rights reserved.Öğe Adsorption of Glutaric Acid and Glyoxylic Acid onto Weakly Basic Ion-Exchange Resin: Equilibrium and Kinetics(Amer Chemical Soc, 2010) Bayazit, Sahika Sena; Inci, Ismail; Uslu, HasanAdsorption equilibria Of glutaric acid and glyoxylic acid on a weakly basic ion-exchanger which has a tertiary amine functional group were investigated experimentally and theoretically in this study. Amberlite IRA-67 was used as the ion-exchange resin. The time to reach an equilibrium state, effects of amount of adsorbent, temperature, and initial acid concentrations on adsorption efficiency and distribution coefficient of acid adsorption were investigated, experimentally. The Langmuir, Freundlich, and Temkin adsorption isotherms were calculated. The equilibrium isotherms were significantly dependent on initial acid concentration. The Langmuir isotherm was found to best represent the data for both acids. The adsorption of both acids followed pseudosecond-order kinetics. Diffusion is not the only rate-controlling step.Öğe Adsorption of Lactic Acid from Model Fermentation Broth onto Activated Carbon and Amber lite IRA-67(Amer Chemical Soc, 2011) Bayazit, Sahika Sena; Inci, Ismail; Uslu, HasanThe aim of this study was to compare the adsorption efficiency of lactic acid onto activated carbon and Amberlite IRA-67, and to define the adsorption isotherms. Activated carbon is a well-known industrial adsorbent and was used in this study; Amberlite IRA-67 is a weakly basic polyacrylic resin with a tertiary amine functional group. Adsorption efficiencies of activated carbon and Amberlite IRA-67 were compared with respect to their percentage of removal acid. The result of this comparison is that Amberlite IRA-67 is more efficient than activated carbon. Each of these adsorbents is in compliance with both the Freundlich and Langmuir isotherms.Öğe Adsorption of Pb(II) ions from aqueous solutions by carbon nanotubes oxidized different methods(Elsevier Science Inc, 2013) Bayazit, Sahika Sena; Inci, IsmailThis study investigated the heavy metal adsorption of the carbon nanotubes (CNTs) oxidized different methods. Besides the conventional ultrasonication method, the UV-light used as an oxidation agent. The two oxidation methods compared with each other by Pb(II) adsorption. The characterizations of oxidized CNTs were analyzed by FTIR, XRD, DTG, SEM and total acidity capacity analysis. The adsorption capacities of carbon nanotubes were compared with using Langmuir and Freundlich isotherms. Two different kinetic theories were applied to experimental data. These theories are pseudo-second order and intraparticle diffusion models. The adsorption results can be compared using non-linear Langmuir isotherm parameters. For single wall carbon nanotubes (SWCNTs), theoretical adsorption capacity value (Qin) of UV-light method is 511.99 mg/g and ultrasonication method is 342.36 mg/g. The UV-light increased the surface acidity of the carbon nanotubes more than ultrasonication. After the adsorption experiments, it is apparently seen that the UV-light oxidation method is a useful method for heavy metal adsorption. (C) 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.Öğe Comparative Equilibrium Studies for Citric Acid by Amberlite LA-2 or Tridodecylamine (TDA)(Amer Chemical Soc, 2009) Bayazit, Sahika Sena; Uslu, Hasan; Inci, IsmailCarboxylic acids like citric acid are produced by fermentation. They have been used in many industrial fields as intermediate and starting materials, and their importance is still growing. It is important to separate them from the fermentation broth. In this sense, comparison of different types of solvents and amines for extraction of carboxylic acids from the fermentation broth and the most effective amine-solvent composition is sought. Studies have been performed on the extraction of citric acid from fermentation broth by tridodecylamine (TDA) (a long chain tertiary amine), and Amberlite LA-2 (a secondary amine mixture). These extractants were dissolved in different solvents having different chemical structures. The extractions were carried out at 298 K. Comparison of the results were made using the distribution coefficient, loading factor, separation factor, and the percentage of extraction yield. The most effective solvent was determined as 1-octanol for both TDA and Amberlite LA-2 with a distribution value of 29.63 and 103.80, respectively. The maximum value of the extraction efficiency was found to be 99.05 % with Amberlite LA-2 in 1-octanol.Öğe Comparison of Solid-Liquid Equilibrium Data for the Adsorption of Propionic Acid and Tartaric Acid from Aqueous Solution onto Amberlite IRA-67(Amer Chemical Soc, 2009) Uslu, Hasan; Inci, Ismail; Bayazit, Sahika Sena; Demir, GoekselInvestigation of adsorption parameters such as effect of initial acid concentration, effect of amount of adsorbent, effect of temperature,;, effect of contact time, fitting data to isotherms, and kinetic models for propionic acid and tartaric acid by using Amberlite IRA-67 adsorbent was studied. The maximum adsorption efficiencies were found to be 97.18% and 84.46% for tartaric acid and propionic acid, respectively. The best fitted isotherm was determined to be Langmuir for tartaric acid. The Langmuir isotherm was better fitted than the Frundlich isotherm for both acids. Elovich model equation was applied for data of each acids. The kinetics of the adsorption for both acids was determined as pseudo-second-order model.Öğe Comparison of the Efficiencies of Amine Extractants on Lactic Acid with Different Organic Solvents(Amer Chemical Soc, 2011) Bayazit, Sahika Sena; Uslu, Hasan; Inci, IsmailThe aim of this study is to compare different types of solvents and amines for extraction of carboxylic acids from fermentation broth and to find the most effective amine solvent composition for the extraction. Studies have been made of the extraction of L-(+)-lactic acid and citric acids from fermentation broth by tridodecylamine (TDA), a long-chain tertiary amine, and Amber lite LA-2, a secondary amine mixture. These extractants dissolved in different solvents which have different chemical structures. The extraction of acids was carried out at 298 K. Comparison of the results was made using the distribution coefficients (K-d), loading factor (Z), and the percentage of extraction yield. 1-Octanol was found to be the most effective solvent with a maximum distribution value of 4.25 and 37.93 for TDA and Amberlite LA-2, respectively.Öğe Extraction of citric acid from aqueous solution by means of a long chain aliphatic quaternary amine/diluent system(Amer Chemical Soc, 2007) Uslu, Hasan; Inci, Ismail; Kirbaslar, S. Ismail; Aydin, AlimetStudies are reported on the extraction of citric acid by trioctyl methyl ammonium chloride dissolved in 1-propanol, 1-octanol, 1-decanol (active solvents), and their mixtures (1: 1 volume ratio). The aim of this study was to investigate the extraction of citric acid from water by a long-chain aliphatic quaternary amine. Experimental results of batch extraction experiments are calculated and reported as distribution coefficients, loading factors, and extraction efficiency. All measurements were carried out at two different temperatures 298.15 K and 303.15 K. The results of the liquid-liquid equilibrium measurements were correlated by a linear solvation energy relationship model, which takes into account physical interactions. Solvatochromic parameters of the model were obtained from the literature. The remaining parameters were fitted to the experimental results. Experimental results for the liquid-liquid equilibrium are compared to the model.Öğe Investigation of Adsorption Equilibrium and Kinetics of Propionic Acid and Glyoxylic Acid from Aqueous Solution by Alumina(Amer Chemical Soc, 2011) Inci, Ismail; Bayazit, Sahika Sena; Uslu, HasanThe adsorption equilibria of propionic acid and glyoxylic acid on alumina are investigated experimentally and theoretically in this study. Alumina was used as the adsorbent. The period of achieving the equilibrium state and the effects of the amount of adsorbent, temperature, and initial acid concentration were investigated experimentally. Langmuir, Freundlich, and Temkin adsorption isotherm equations are fitted well with the experimentally measured data. It was found that the equilibrium isotherms depended on the initial acid concentration significantly. The Langmuir isotherm was found to best represent the data for both of the acids. The pseudosecond-order model, intraparticle diffusion model, and Elovich model were applied to experimental data. The adsorption of both acids followed pseudosecond-order kinetics. Diffusion is not the only rate-controlling step.Öğe Investigation of Formic Acid Separation from Aqueous Solution by Reactive Extraction: Effects of Extractant and Diluent(Amer Chemical Soc, 2010) Sahin, Selin; Bayazit, Sahika Sena; Bilgin, Mehmet; Inci, IsmailThis study aims to investigate the extraction of formic acid by a high molecular-weight aliphatic amine, tridodecylamine (TDA), and a phosphorus-bonded, oxygen-containing extractant, tributyl phosphate (TBP), dissolved in five different diluents (ethyl valerate. diethyl adipate, diethyl sebacate, I-octanol, and heptane) each The experiments were carried out at 298 15 K Comparisons of the results were made using the distribution coefficient, loading factor, separation factor, and the percentage of extraction yield. The results demonstrated that combination of TDA and diethyl adipate had the greatest synergistic effects with a distribution value of 6 The maximum value of the extraction efficiency was found to be 87 % with a 1 09 mol . L(-1) concentration of TDA in diethyl Alpine.Öğe LSER modeling of extraction of succinic acid by tridodecylamine dissolved in 2-octanone and 1-octanol(Elsevier Science Inc, 2012) Inci, Ismail; Asci, Y. Selim; Uslu, HasanReactive extraction can be used for the recovery of carboxylic acids from fermentation broth. Through the formation of complex with extractants at the two-phase interface, the carboxylic acids are partitioned into organic solvents. But, the recovery of carboxylic acids is interrupted by the conditions of fermentation broth. In this work, kinetic studies for the extraction of succinic acid from aqueous solution with tridodecylamine diluted in 2-octanone and 1-octanol have been carried out. Equilibrium and kinetic studies for the extraction of succinic acid from aqueous solution with tridodecylamine diluted in two functional groups (alcohol and ketone) such as 2-octanone and 1-octanol are reported. All measurements have been carried out at 298.15 K. The results of the liquid-liquid equilibrium measurements have been correlated by a linear solvation energy relationship - LSER model which takes into account physical interactions. (C) 2011 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.Öğe Oxalic acid removal from wastewater using multi-walled carbon nanotubes: Kinetic and equilibrium analysis(Taylor & Francis Inc, 2017) Ozcan, Onder; Inci, Ismail; Asci, Yavuz Selim; Bayazit, Sahika SenaOxalic acid adsorption from aqueous solution is studied in this work. Multi-walled carbon nanotubes (MWCNT) were used as an adsorbent. The investigated adsorption variables are equilibrium time, initial acid concentration, and temperature. The experimental results were presented using equilibrium isotherm and kinetic models. The used equilibrium models are Langmuir, Freundlich, and Temkin adsorption isotherms. And the kinetic models are Elovich, Lagergren pseudo-first-order and pseudo-second-order kinetic models. The thermodynamics studies were carried out at three different temperatures: 278, 298, and 318K. Langmuir isotherm was the best fitted equilibrium model for the experimental data. The all applied kinetic models fitted the data suitably.Öğe Purification of Biotechnological Carboxylic Acids with an Adsorption Method Using Single-Walled Carbon Nanotubes(Amer Chemical Soc, 2010) Arslanoglu, Ozge Nurhayat; Inci, Ismail; Bayazit, Sahika SenaAdsorption is a very important and valuable method for separation of carboxylic acids from aqueous solutions. In this study, single-walled carbon nanotubes (SWCNT) were used as an adsorbent for this purpose. Important biotechnological acids, tartaric acid and citric acid, were used. The equilibrium time and the adsorption capacity at three different temperatures (25 degrees C, 35 degrees C, and 45 degrees C) were investigated. Reaction kinetics and the diffusion between the acid molecules and SWCNT pores were investigated. The aim of this study was to determine the adsorption capability of SWCNT for carboxylic acids of biological importance from their fermentation media.Öğe Separation of Succinic Acid from Aqueous Solution by Alumina Adsorption(Amer Chemical Soc, 2011) Inci, Ismail; Bayazit, Sahika Sena; Asci, Yavuz SelimAttempts were made to recover succinic acid (IUPAC systematic name as ethane 1,2-dicarboxylic acid) from aqueous solutions by alumina adsorption. Experimental adsorption works were conducted with aqueous solutions containing succinic acid in four different concentrations: (0.13, 0.22, 0.32, and 0.45) mol.kg(-1). Alumina were used in 10 different amounts: (0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, and 2) g. Also adsorption experiments were carried out at three different temperatures: (298, 308, and 318) K. The equilibrium distributions of succinic acid were determined. The minimum equilibrium concentration of succinic acid was 0.28 mol.kg(-1) for 0.45 mol.kg(-1) succinic acid concentration with 2 g of alumina The adsorption data fit well within the Langmuir, Freundlich, and Temkin isotherms. Isotherm parameters have been obtained. Also the kinetics of the adsorption for succinic acid were determined as the pseudosecond-order model.Öğe Solid-liquid equilibrium of glycolic acid with alumina(Desalination Publ, 2015) Inci, Ismail; Bayazit, Sahika Sena; Asci, Yavuz SelimThis work aims to present novel adsorption equilibrium data for glycolic acid with alumina at aqueous solutions. The adsorption experiments were carried out with aqueous glycolic acid solutions with various initial concentrations (0.38-2.1) molL(-1). Adsorbent alumina of (0.2-2) g was used. To show the effect of temperature, also adsorption equilibrium experiments were made at various temperatures (298, 308, and 318K). The equilibrium concentrations of glycolic acid have been found. Removal of glycolic acid was 20.51% as the maximum percentage. The equilibrium data show well fitting with Langmuir isotherm. Also, Elovich model have been applied to adsorption data.Öğe A Study on Glutaric Acid Extraction by Tridodecylamine: Equilibria and Models(Wiley-V C H Verlag Gmbh, 2009) Uslu, Hasan; Inci, IsmailThe extraction of glutaric acid was studied using tridodecyl amine (TDA) with respect to the functional groups of the diluent. The diluents studied were 1-octanol (alcohol), methyl isobuthyl ketone, MIBK (ketone), and toluene (aromatic hydrocarbon) and these were used to dilute the TDA. The experimental results of batch extraction experiments are reported as distribution coefficients, D(C), loading factors, Z, and extraction efficiency, E. All measurements were carried out at 298.15 K. The results of the liquid-liquid equilibrium measurements are correlated by a linear solvation energy relationship (LSER) model that takes into account physical interactions and modified Freundlich and Langmuir equations. The experimental results are compared with model results.
