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    Applicability of the various adsorption models of three dyes adsorption onto activated carbon prepared waste apricot
    (Elsevier Science Bv, 2006) Basar, Canan Akmil
    In this study, activated carbon (WA11Zn5) was prepared from waste apricot, which is waste in apricot plants in Malatya, by chemical activation with ZnCl2. BET surface area of activated carbon is determined as 1060 m(2)/g. Activated carbon includes both micro and mesopores. Percentages of micropores and mesopores area are determined 36% and 74%, percentage of micropores and mesopores volume is 19% and 81%, respectively. The ability of WA11Zn5, to remove three dyes, methylene blue (MB), malachite green (MG), and crystal violet (CV), from effluent solutions by adsorption has been studied. The adsorption capacities of WA11Zn5 decreases in the order malachite green (MG) > methylene blue (MB) > crystal violet (CV). Equilibrium isotherms for the adsorption of three dyes on activated carbon were measured experimentally. Results were analyzed by the Langmiur, Freundlich, Dubinin-Redushkevich (D-R), Temkin, Frumkin, Harkins-Jura, Halsey and Henderson equation using linearized correlation coefficient at different temperature. The characteristic parameters for each isotherm have been determined. Models and the isotherm constant were evaluated depending on temperature. Langmiur and Frumkin equation is found to best represent the equilibrium data for three dye-WA11Zn5 systems. (c) 2005 Elsevier B.V. All rights reserved.
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    Evaluation of optimum carbonization conditions of the blended domestic polymeric waste, biomass and lignite in the presence of catalyst by Taguchi and ANOVA optimization analysis
    (Elsevier, 2022) Basar, Canan Akmil; Korkmaz, Aydan Aksogan; Onal, Yunus; Utku, Tugba
    In this work, the effects of blending mass ratio, pyrolysis temperature, pyrolysis time, heating rate, and amount of catalyst on the pyrolysis of the blended lignite (EL), pistachio shell (PS) and domestic wastes (DW) were investigated. The influence of experimental parameters on the char, liquid and gas efficiency was statistically evaluated by the Taguchi method and ANOVA analysis. The optimum experimental conditions is a1b1c2d1e3, a3b1c1d1e2, a2b3c2d3e2 for liquid efficiency, char efficiency and gas efficiency respectively. The amount of catalyst was found to be the most effective parameter for solid efficiency and the mass ratio for both liquid and gas efficiency. The char, liquid and gas efficiencys estimated by the Taguchi method under optimum experimental conditions are 39.58%, 18.5% and 47.04%, respectively. The char efficiency of 42.54%, liquid efficiency of 19.78% and gas efficiency of 49.83% were determined under optimum experimental conditions obtained by the Taguchi method. Analysis of Variance (ANOVA) was also used to determine the mean response magnitudes of each controllable process parameter. ANOVA analysis results support the results found by the Taguchi method. In the carbonization process, FTIR, XRD and SEM analyzes were performed to determine the structural change of the solid product depending on the temperature.
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    The investigation of structural alteration of raw materials used to attain graphene quantum dots in different prolysis conditions
    (Elsevier, 2022) Kir, Sifa; Dehri, Ilyas; Onal, Yunus; Esen, Ramazan; Basar, Canan Akmil
    Graphene quantum dots which is one of the carbon allotrope become widespread an industrial usage due to the unique optical and electrical properties. Graphene Quantum Dots (GQDs) is obtained from the materials such as graphite, glycine, alginate, glucose whose structure contains carbon atoms. In this study, molasses that are used to attain GQDs are carbonized at the temperature of 200, 250, 300, 350 and 400 degrees C for 2 h. The DTA method was used to determine the melting temperature of the molasses. In order to determine the elemental and optical properties of the obtained graphene quantum dots particles, XRD, SEM, Elemental Analysis, Fluorescence Spectrometry techniques and UV-Visible Spectroscopy are used. Mass loss values was also determined and studied its effects were the outcome. The results obtained from these techniques show that the material obtained from the molasses is GQDs.
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    Nonisothermal Dehydration Kinetics of Tincalconite by Thermal Analysis Data
    (Soc Chemical Eng Japan, 2009) Ekmekyapar, Ahmet; Basar, Canan Akmil; Yuceer, Mehmet
    In the present study, the thermal decomposition kinetics of tincalconite was investigated by using thermo gravimetric (TG) and differential thermal analysis (DTA) data. The modified form of asymptotic expansion of the temperature integral integral(infinity)(x)(e(-x)/x(2))dx, which is employed in a wide range of x = E/RT ratios, was used to perform the kinetic analysis. An empirical model was suggested for calculation of activation energy for non-isothermal decomposition kinetics of solids. The calculation of activation energy of tincalconite was carried out by means of different methods. It was determined that the process takes place in two steps and fits a first order reaction kinetic model. The results obtained from five methods were generally in good agreement.
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    Particle size effect of raw material on the pore structure of carbon support and its adsorption capability
    (Taylor & Francis Inc, 2017) Erdogan, Selim; Basar, Canan Akmil; Onal, Yunus
    In this study, a series of activated carbons were prepared from Tuncbilek lignite with different particle size by chemical activation. The effect of particle size of lignite on the pore structure of activated carbon and the adsorption kinetics of crystal violet (CV) onto these activated carbons was investigated. BET surface area values of activated carbon samples were determined in the range of 940-1054m(2) g(-1). Adsorption capacity of CV onto activated carbons was investigated in a batch system by considering the effects of various parameters such as initial dye concentration, agitation time and adsorption temperature. The Langmuir and Freundlich isotherms were used to describe the adsorption equilibrium studies. The adsorption kinetics of CV has been discussed using the pseudo-first-order, pseudo-second-order and intraparticle diffusion models. Results show that the pseudo-second-order kinetic equation could describe the adsorption kinetics for CV onto activated carbons. Using the thermodynamic equilibrium coefficient obtained at different temperatures and for the initial dye, the thermodynamic constants of adsorption (G degrees, H degrees and S degrees) were also evaluated.
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    Removal of Copper Ions from Waters Using Surfactant-Enhanced Hybrid PAC/MF Process
    (Asce-Amer Soc Civil Engineers, 2009) Basar, Canan Akmil; Aydiner, Coskun; Kara, Serdar; Keskinler, Bulent
    This paper deals with the removal of copper ions from aqueous solutions by using surfactant-enhanced powdered activated carbon (PAC)/microfiltration (MF) hybrid process, including the evaluation of process performance and fouling dynamics at various linear alkyl benzene sulfonate (LABS), PAC, and Cu2+ concentrations of feed solution. Although the use of surfactant as an additive material increased the adsorption efficiency in PAC/MF hybrid process, a considerable amount of the flux was lost for surfactant concentration above critical micelle concentration. The process could be employed with a performance of 74.7%, 97.2% and 87 L/m(2) h for LABS rejection, Cu2+ rejection and permeate flux at the conditions of 2 g PAC/L, 5 mM LABS, 0.2 mM Cu2+, and 60-min process time. Cu2+ rejection, which increased with increasing of LABS, and PAC amounts decreased with the increase in Cu2+ concentration. It was understood that the increments in LABS, PAC, and Cu2+ concentrations being an indicator for the feed solution quality led to the occurrence of more fouling on the membrane. The analyses of dynamics concerning the fouling behaviors, which were carried out using single and combined pore blocking models, put forward that the cake formation was the main predominant mechanism in the process. It was also determined that the variation of feed contents deduced the presence of rather complex fouling behaviors as a simultaneous function of secondary membrane layer formation and clogging and narrowing of membrane pores by surfactants.
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    V2O5-polyimide hybrid material: synthesis, characterization, and sulfur removal properties in fuels
    (Springer, 2014) Erdogan, Selim; Koytepe, Suleyman; Seckin, Turgay; Onal, Yunus; Vural, Sema; Basar, Canan Akmil
    We describe the synthesis of a new sorbent material for desulfurization of gasoline, which is composed of polyimide (PI) and vanadium pentoxide via the solution direct-dispersing method. The highly porous PI-V2O5 hybrid materials, containing different concentrations of V2O5 ranging from 1 to 10 wt%, were prepared from pyromellitic dianhydride, 2,4,6-triaminopyrimidine, and vanadium pentoxide. The produced PI-V2O5 composites were investigated by X-ray diffraction analysis, Fourier transform infrared spectroscopy, scanning electron microscope, and thermal analysis techniques. The effect of V2O5 on the sulfur removal properties as well as the thermal stability and porous structure of composites were investigated. Then the obtained material was investigated to determine their sorption characteristics for sulfur compounds from fuels. By use of this material, 91 wt% of the sulfur content was removed from sulfur-containing standard oil. An economic sensitive and simple method for the removal and separation of sulfur in fuel samples, using an PI-V2O5 packed mini chromatographic column, was established.