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    Intensification of Citric Acid Extraction by a Mixture of Trioctylamine and Tridodecylamine in Different Diluents
    (Amer Chemical Soc, 2015) Datta, Dipaloy; Asci, Yavuz Selim; Tuyun, Amac Fatih
    Extraction of citric acid (0.595 mol.kg(-1)) from aqueous solutions has been investigated by using binary extractant system comprising of trioctylamine (TOA) + tridodecylamine (TDA) at six different concentrations (0.19 mol.kg(-1) to 1.16 mol.kg(-1)). The extractant system is diluted using five different solvents such as dimethyl phthalate (DMP), methyl isobutyl ketone (MIBK), 2-octanone, 1-decanol, and cyclohexylacetate (CHA). The batch extraction results of citric acid for the design of a separator have been obtained. The data are interpreted in terms of distribution coefficient (D), loading factors (Z), and extraction efficiency (%E). The values of D for the citric acid extraction are found to vary from 0.40 to 118 for DMP, MIBK, and 2-octanone. For 1-decanol and CHA diluent, the values are observed in the range of 0.38 to 98.16 and 0.39 to 86.76, respectively. Considerable amount of citric acid is recovered (almost 99 %) by all the aminediluent systems at 1.16 mol.kg(-1) initial concentration of (TOA + TDA) mixture.
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    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 Sena
    Oxalic 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.
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    Rapid adsorptive removal of naphthalene from water using graphene nanoplatelet/MIL-101 (Cr) nanocomposite
    (Elsevier Science Sa, 2017) Bayazit, Sahika Sena; Yildiz, Mahmut; Asci, Yavuz Selim; Sahin, Musa; Bener, Mustafa; Eglence, Songul; Salam, Mohamed Abdel
    The study of the adsorption equilibria of naphthalene onto graphene nanoplatelet supported MIL-101 composite material (GNP/MIL-101) has been conducted. In the experimental context of this study, firstly GNP/MIL-101 was synthesized by applying hydrothermal method and characterized via FTIR, XRD, SEM, TEM and surface area analyses. The effects of GNP/MIL-101 amount, temperature and initial naphthalene concentration on the adsorption process have been investigated. Results show that the maximum removal of naphthalene was obtained as about 93% by 0.075 g GNP/MIL-101 at 298 K. The isothermal data were fitted to linear and non-linear Langmuir, Freundlich, and Temkin adsorption isotherm models and the kinetic data were fitted to Elovich and other kinetic models. Adsorption depended on initial naphthalene concentration at investigated various temperatures (298, 308, 318 K) significantly. The temperature dependence of adsorption process is associated with the changes in several thermodynamic parameters such as standard free energy (.6..G0), enthalpy(.6,H0) and entropy (.66). (C) 2017 Elsevier B.V. All rights reserved.
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    Separation of Succinic Acid from Aqueous Solution by Alumina Adsorption
    (Amer Chemical Soc, 2011) Inci, Ismail; Bayazit, Sahika Sena; Asci, Yavuz Selim
    Attempts 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.
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    Solid-liquid equilibrium of glycolic acid with alumina
    (Desalination Publ, 2015) Inci, Ismail; Bayazit, Sahika Sena; Asci, Yavuz Selim
    This 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.