Yazar "Tay, Turgay" seçeneğine göre listele

Listeleniyor 1 - 6 / 6
  • Küçük Resim Yok
    Öğe
    Activated Carbons From Grape Seeds By Chemical Activation With Potassium Carbonate And Potassium Hydroxide
    (Elsevier, 2014) Okman, Irem; Karagoz, Selhan; Tay, Turgay; Erdem, Murat
    Activated carbons were produced from grape seed using either potassium carbonate (K2CO3) or potassium hydroxide (KOH). The carbonization experiments were accomplished at 600 and 800 degrees C. The effects of the experimental conditions (i.e., type of activation reagents, reagent concentrations, and carbonization temperatures) on the yields and the properties of these activated carbons were analyzed under identical conditions. An increase in the temperature at the same concentrations for both K2CO3 and KOH led to a decrease in the yields of the activated carbons. The lowest activated carbon yields were obtained at 800 degrees C at the highest reagent concentration (100 wt%) for both K2CO3 and KOH. The activated carbon with the highest surface area of 1238 m(2) g(-1) was obtained at 800 degrees C in K2CO3 concentration of 50 wt% while KOH produced the activated carbon with the highest surface area of 1222 m(2)g(-1) in a concentration of 25wt% at 800 degrees C. The obtained activated carbons were mainly microporous. (C) 2013 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    ADSORPTION OF METHYLENE BLUE FROM AQUEOUS SOLUTION ON ACTIVATED CARBON PRODUCED FROM SOYBEAN OIL CAKE BY KOH ACTIVATION
    (North Carolina State Univ Dept Wood & Paper Sci, 2012) Tay, Turgay; Erdem, Murat; Ceylan, Burak; Karagoz, Selhan
    This study presents the adsorption behavior of the methylene blue (MB) dye onto the activated carbon produced from soybean oil cake by chemical activation with KOH at 800 degrees C. The adsorption isotherms, kinetic models, and thermodynamic parameters of the adsorption were studied. The Langmuir isotherm showed a better fit than the Freundlich isotherm. The adsorption rate was described by pseudo-second-order kinetics. The negative values of Delta G degrees and the positive values of Delta H degrees indicate that the adsorption of MB was favored and endothermic.
  • Küçük Resim Yok
    Öğe
    Preparation and characterization of activated carbon produced from pomegranate seeds by ZnCl2 activation
    (Elsevier Science Bv, 2009) Ucar, Suat; Erdem, Murat; Tay, Turgay; Karagoz, Selhan
    In this study, pomegranate seeds, a by-product of fruit juice industry, were used as precursor for the preparation of activated carbon by chemical activation with ZnCl2. The influence of process variables such as the carbonization temperature and the impregnation ratio on textural and chemical-surface properties of the activated carbons was studied. When using the 2.0 impregnation ratio at the carbonization temperature of 600 degrees C, the specific surface area of the resultant carbon is as high as 978.8 m(2) g (1). The results showed that the surface area and total pore volume of the activated carbons at the lowest impregnation ratio and the carbonization temperature were achieved as high as 709.4 m(2) g (1) and 0.329 cm(3) g (1). The surface area was strongly influenced by the impregnation ratio of activation reagent and the subsequent carbonization temperature. (C) 2009 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Preparation and Characterization of Activated Carbons from Waste Melamine Coated Chipboard by NaOH Activation
    (Foundation Environmental Protection & Research-Fepr, 2012) Zengin, Ayse; Akalin, Mehmet Kuddusi; Tekin, Kubilay; Erdem, Murat; Tay, Turgay; Karagoz, Selhan
    Activated carbons were prepared from the pyrolysis of waste melamine coated chipboard at 600 and 800 degrees C by chemical activation with NaOH. The effects of the carbonization temperature and concentration of chemical reagent on their chemical-surface properties were investigated. The highest surface area was obtained at 600 degrees C with the 50 wt. % concentration of sodium hydroxide. The external surfaces of the activated carbons showed amorphous and heterogeneous structures.
  • Küçük Resim Yok
    Öğe
    Removal of lead (II) and nickel (II) ions from aqueous solution using activated carbon prepared from rapeseed oil cake by Na2CO3 activation
    (Springer, 2015) Ucar, Suat; Erdem, Murat; Tay, Turgay; Karagoz, Selhan
    In this study, rapeseed oil cake as a precursor was used to prepare activated carbons by chemical activation with sodium carbonate (Na2CO3) at 600 and 800 A degrees C. The activated carbon with the highest surface area of 850 m(2) g(-1) was produced at 800 A degrees C. The prepared activated carbons were mainly microporous. The activated carbon having the highest surface area was used as an adsorbent for the removal of lead (II) and nickel (II) ions from aqueous solutions. The effects of pH, contact time, and initial ion concentration on the adsorption capacity of the activated carbon were investigated. The kinetic data of adsorption process were studied using pseudo-first-order, pseudo-second-order kinetic models and intraparticle diffusion model. The experimental data were well adapted to the pseudo-second-order model for both tested ions. The adsorption data for both ions were well correlated with Langmuir isotherm. The maximum monolayer adsorption capacities of the activated carbon for the removal of lead (II) and nickel (II) ions were determined as 129.87 and 133.33 mg g(-1), respectively.
  • Küçük Resim Yok
    Öğe
    Removal of Lead (II) Ions from Aqueous Solutions onto Activated Carbon Derived from Waste Biomass
    (Hindawi Publishing Corporation, 2013) Erdem, Murat; Ucar, Suat; Karagoz, Selhan; Tay, Turgay
    The removal of lead (II) ions from aqueous solutions was carried out using an activated carbon prepared from a waste biomass. The effects of various parameters such as pH, contact time, initial concentration of lead (II) ions, and temperature on the adsorption process were investigated. Energy Dispersive X-Ray Spectroscopy (EDS) analysis after adsorption reveals the accumulation of lead (II) ions onto activated carbon. The Langmuir and Freundlich isotherm models were applied to analyze equilibrium data. The maximum monolayer adsorption capacity of activated carbon was found to be 476.2 mg g(-1). The kinetic data were evaluated and the pseudo-second-order equation provided the best correlation. Thermodynamic parameters suggest that the adsorption process is endothermic and spontaneous.