Yazar "Ziyadanogullari, B" seçeneğine göre listele

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    Characterization and spectrophotometric studies of new Cu(II), Ni(II), Zn(II) complexes with Schiff base derived from 192-bis-(o-aminophenoxy)ethane and salicylaldehydel
    (Maik Nauka/Interperiodica/Springer, 2005) Aydin, H; Ziyadanogullari, B; Temel, H
    The thermodynamic parameters of complexes of Cu(II), Ni(II), and Zn(II) cations with 1,2-bis-(o-aminophenoxy)ethane and salicylaldehyde were determined in 60% (v/v) DMF-water, with various ionic strengths (0.07, 0.13, and 0.2 M NaNO3), and at different temperatures (25, 30, 35, and 40 +/- 0.1 degrees C) using a spectrophotometric method. Sodium nitrate solution was used to maintain the ionic strengths. The stability constants show an inverse relationship with ionic strengths. The thermodynamic parameters (60% (v/v) DMF-water) (Delta G degrees, Delta H degrees, Delta S degrees) based on these formation constants were determined. The values of enthalpy change are negative for all systems. The ligand behaves toward the metal ion as a tetradentate ligand. The acid dissociation constant of ligand was investigated in 60% (v/v) DMF-water and calculated at different temperatures.
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    Determination of cadmium separated selectively with ion exchange method from solution by ICP-AES
    (Marcel Dekker Inc, 2000) Ziyadanogullari, B
    The removal of heavy metals, such as cadmium, from solution was investigated by using modified asphaltite ash as an ion exchange. Analysis were determined using inductively coupled plasma atomic emission spectrometry (i.e., ICP-AES). The effect of time, temperature, pH and concentration of cadmium on the removal process of cadmium was examined. An optimum condition for complete removal of cadmium from solution has been found. Therefore pretreated asphaltite ash can be used as an alternative material for removal of cadmium from industrial waste waters.
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    Determination of stability constants and thermodynamic parameters of some metal complexes with 2-hydroxynaphthalene-1-carbaldehydene-1-naphthylamine
    (Maik Nauka/Interperiodica/Springer, 2005) Ziyadanogullari, B; Aydin, F; Sahin, E; Aydin, I; Temel, H
    The thermodynamic parameters of complexes of Cu(II), Ni(II), and Zn(II) cations with hydroxynaphthalene-1-carbaldehydene-1-naphthylamine were determined in 60% (v/v) DMF-water, at various ionic strengths (0.07, 0.13, 0.2 M NaNO3), and at different temperatures (25, 30, 35, 40 +/- 0.1 degrees C) using a spectrophotometric method. A sodium nitrate solution was used to maintain the ionic strengths. The stability constants show an inverse relationship with the ionic strengths. The thermodynamic parameters (60% (v/v) DMF-water (Delta G(0), Delta H-0, Delta S-0)) based on these formation constants were determined. The acid dissociation constant of the ligand was investigated in 60% (v/v) DMF-water and was also calculated at different temperatures.
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    Effect of structural modifications of diaza-18-crown-6 on the extractability and selectivity of univalent metal picrates
    (Elsevier Science Bv, 2001) Ziyadanogullari, B; Topal, G; Erdogan, S; Hamamci, C; Hosgoren, H
    The solvent extraction of univalent metal cations with N,N'-dibenzyl-1,4,10,13-tetraoxa-7,16 diaza-2,3,11,12-dibenzocycloocta deca-2,11-diene (L-1), N,N'-didodecyl-1,4,10,13-tetraoxa-7,16-diaza-2,3-benzocylooctadeca-2-ene (L-2) and N,N'-dibenzyl-1,4,10,13-tetraoxa-7,16-diaza-2,3,11,12-dibenzocyclo octadeca-2,11-diene (L-3) with picrate anion into dichloromethane has been studied at 25 degreesC by UV-visible spectroscopy. The extractability and selectivity of univalent metal picrates (Li+, Na+, Ag+, PhCH2NH3+, NH4+) was evaluated as a function of [ligand]/[metal cation]. L-2 showed the highest extractability and selectivity for Lit over the larger studied cations, and also exhibited the highest [Li+]/[NH4+] selectivity as L/M = 1. (C) 2001 Elsevier Science B.V. All rights reserved.
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    Recovery of copper and cobalt from concentrate and converter slag
    (Marcel Dekker Inc, 2000) Ziyadanogullari, B
    This study was designed to recover copper and cobalt hydrometallurgically from an enriched concentrate of flotation and converter slag. Three slag samples collected from the Ergani Copper Co. of Etibank were studied. In order to convert the copper and cobalt into sulfate compounds, samples were roasted after sulfurization and leached with water. The hydrometallurgical process involves sulfurizing the slag and then roasting the samples to form CuSO4 and CoSO4. The roasted samples were treated with water; copper and cobalt were dissolved while any other impurities remained in the solid phase. Very little iron was dissolved; only 0.2-0.3% of the total. The sulfurization experiments were carried out in a closed system and roasted at 600 degrees C for differ ent times to optimize the process. Under optimum conditions almost all of the copper and cobalt were dissolved and recovered in high purity and with high yield.
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    The recovery of copper and cobalt from oxidized copper ore and converter slag
    (Scientific Technical Research Council Turkey, 1999) Ziyadanogullari, B; Ziyadanogullari, R
    The aim of this study was to develop a method for obtaining copper and cobalt from oxidized copper ore and converter slag. In order to convert the copper and cobalt into sulfate compounds the main step was to roast the samples obtained by sulfurization and transfer the samples into solution. First the oxidized copper ore was roasted, followed by the mixture of converter slag and oxidized copper ore. Since the levels of copper and cobalt were low, the sulfurization process was carried out under autoclave conditions. The samples obtained were roasted. The yields of copper and cobalt passed into the solution under optimum conditions were 96.7% and 86.1%, respectively.
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    Recovery of copper, cobalt, nickel, cadmium, zinc and bismuth from electrolytic copper solution
    (Scientific Technical Research Council Turkey, 1998) Aydin, F; Yavuz, O; Ziyadanogullari, B; Ziyadanogullari, R
    An electrolytic Copper Solution (ECS) was electrolyzed using platinum electrodes. Copper was obtained in solid form. In order to precipitate Cd(II), Bi(III), As(III), Sb(III) and the rest of the Cu(II) ions, H2S gas was passed through the remaining solution. The remaining solution was evaporated to obtain metal sulphates. The sample containing metal sulphates was roasted at temperatures between 550 and 800 degrees C. Cobalt, nickel and zinc in the solid sample remained in the form of metal sulphates, while the iron in the sample was converted into Fe2O3. This solid sample was dissolved in water and filtered in order to crystallize the NiSO4. As a result of crystallization, a maximum yield of 86.2 % m as obtained. The solid containing metal sulphides (CuS, CdS, Bi2S3 and Sb2S3) was roasted at 600 degrees C for 3 hours. The roasted sample was dissolved in water and filtered. It was determined that the conversion of CuS into CuSO4 occurred, together with the conversion of CdS and Bi2S3 into CdO and Bi2O3. The samples containing CdO and Bi2O3 were then leached with 0.5 M H2SO4 solution at 50 degrees C for one hour. The extraction yield was 97%.
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    Removal of cadmium from aqueous solution by natural and thermally activated dolomite
    (Inst Lebensmitteltechnologie Analytische Chemie, 2002) Yavuz, Ö; Ziyadanogullari, B; Aydin, I; Bingöl, H
    Removal of Cd(II) from aqueous solution by natural and thermally activated dolomite was investigated. Maximum activation temperature and maximum adsorption capacities were determined as 700 degreesC for 2 hours and 1.02 mg g(-1) for natural dolomite, but 64.93 mg g(-1) for thermally activated dolomite at 25 degreesC, respectively. Equilibrium contact time of cadmium was determined as 1 hour. Adsorption of Cd(II) on dolomite conforms to Langmuir's isotherm.
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    Removal of lead in solution using modified asphaltite ash as an ion exchange probe
    (Inst Lebensmitteltechnologie Analytische Chemie, 1998) Ziyadanogullari, B
    This work describes the complete removal of lead from solution using modified asphaltite ash as an ion exchange probe, The effect of time, temperature and pH on the removal process of lead was investigated and conditions were optimized for the complete removal of lead. An optimum condition for complete removal of lead from solution has been found.
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    Synthesis, spectral studies, and determination of stability constants and thermodynamic parameters for some aromatic diamine transition-metal complexes
    (Pleiades Publishing Inc, 2006) Temel, H; Ziyadanogullari, B; Alp, H; Aydin, I; Aydin, F; Ilhan, S
    The Cu(II) and Zn(II) complexes of aromatic bidentate diamines were prepared and characterized by different analytical and spectral methods. Thermodynamic parameters of complexes of Cu(II) and Zn(II) cations with 1,3-bis(p-aminophenoxy)propane were determined in 60 vol. % DMF-H2O at various ionic strengths (0.07, 0.13, 0.2 M NaNO3) and different temperatures (45, 50, 55, 60 +/- 0.1 degrees C) using a spectrophotometric method. The NaNO3 solution was used to maintain the ionic strength. The stability constants show an inverse relationship with ionic strengths. The thermodynamic parameters of 60 vol. % DMF-H2O (Delta G degrees, Delta H degrees, Delta S degrees) based on these formation constants were determined.
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    Synthesis, spectroscopic and thermodynamic studies of new transition metal complexes with N,N?-bis(2-hydroxynaphthalin-1-carbaldehydene)-1,2-bis(m-aminophenoxy)ethane and their determination by spectrophotometric methods
    (Taylor & Francis Ltd, 2005) Temel, H; Ziyadanogullari, B; Aydin, I; Aydin, F
    A novel tetradentate N2O2-type Schiff base, synthesized from 1,2-bis(m-aminophenoxy)ethane and 2-hydroxynaphthalin-1-carbaldehyde, forms stable complexes with transition metal ions such as Cu(II), VO(IV) and Zn(II) in DMF. Microanalytical data, elemental analysis, magnetic measurements, UV, visible and IR spectra as well as conductance measurements were used to confirm the structures. The stability constants of these complexes in 60% (v/v) DMF-water were determined at different ionic strengths (0.07, 0.13, 0.2 M) and at different temperatures (45,50,55,60 +/- 0.1 degrees C) using a spectrophotometric method. From these constants, thermodynamic stability constants and thermodynamic parameters (Delta G(0), Delta H degrees, Delta S degrees) were calculated. The values of enthalpy change are negative for all systems. The acid dissociation constant of the ligand, investigated in 60% (v/v) DMF-water, has also been calculated at different temperatures.