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    ?-carotene rejection mechanism from organic medium by using activated carbon produced from waste biomass apricot
    (Taylor & Francis Inc, 2017) Akmil-Basar, Canan; Durmaz, Gokhan; Karabulut, Ihsan; Onal, Yunus
    The present paper deals with the study of adsorption of beta-carotene in tetrahydrofuran solution on activated carbon. Activated carbon was prepared from apricot waste, which is a by-product of apricot processing by means of chemical activation with ZnCl2. BET surface area of activated carbon was measured to be 1060m(2) g(-1). The effect of adsorption time, percentage of activated carbon in beta-carotene solution, and beta-carotene concentration on adsorption efficiency was also determined. Results were analyzed by the Langmiur, Freundlich, Dubinin-Redushkevich (D-R), Temkin, Frumkin, Harkins-Jura, Halse, Henderson, and Henry isotherms with linearized correlation coefficient. The characteristic parameters for each isotherm have also been determined. The kinetics of beta-carotene adsorption has been discussed by the pseudo-first-order model, the pseudo-second-order model, the Elovich equation, the intraparticle diffusion model, the Bangham equation, and the modified Freundlich equation. Three error analysis methods of residual mean square error (RMSE), chi-square statistic ((2)), and the average percentage error (% APE) have been used.
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    Dye removal by dead biomass of newly isolated Pleurotus ostreatus strain
    (Natl Inst Science Communication-Niscair, 2018) Dogan, Demet; Boran, Filiz; Kahraman, Sibel; Akmil-Basar, Canan; Yesilada, Ozfer
    Dead biomass prepared from newly isolated Pleurotus ostreatus strain was tested for their efficiency in removal of indigo carmine. The effects of operational parameters such as contact time, initial dye concentration, amount of biomass, initial pH and agitation rate on removal were examined. The dye removal increased rapidly during the first 60 minutes (87%) and remained nearly constant between 60 - 120 minutes of adsorption (87 - 90%). The removal of dye by dead biomass of newly isolated P. ostreatus was clearly dependent on the initial dye concentration of the solution and dye removal was reduced from 83% to 53% as concentration was increased from 100 to 500 mg/L indigo carmine. Results were analyzed by the Langmiur, Freundlich, Dubinin-Redushkevich (D-R), Temkin, Frumkin, Harkins-Jura, Halsey, Henderson isotherm using linearised correlation coefficient. The kinetics of adsorption of IC have been discussed using six kinetic models, i.e., the pseudo first order model, the pseudo second order model, the Elovich equation, the intraparticle diffusion model, the Bangham equation, the modified Freundlich equation. In order to determine the best fit isotherm and kinetic models, three error analysis methods of residual mean square error (RMSE), chi-square (X-2) statistic and the average percentage error (APE%) were used to evaluate the data.
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    Obtaining butter oil triacylglycerols free from ?-carotene and ?-tocopherol via activated carbon adsorption and alumina-column chromatography treatments
    (Springer, 2008) Karabulut, Ihsan; Topcu, Ali; Akmil-Basar, Canan; Onal, Yunus; Lampi, Anna-Maija
    It is difficult to remove beta-carotene from oils with alumina-column chromatography, because beta-carotene is even less-polar than triacylglycerols (TAGs) are. The objective of this study was to obtain butter oil TAGs free from beta-carotene and antioxidants via sequential treatments with activated carbon (AC) adsorption and alumina column chromatography. The AC used was prepared from waste apricots. The effects of AC dosages, temperatures and time courses on beta-carotene adsorption were studied. The Langmuir and Freundlich isotherms were used to describe the adsorption of beta-carotene onto AC, and it was found to be more consistent with the Freundlich isotherm with a higher R-2 value (0.9784). Adsorption kinetics of beta-carotene was analyzed by pseudo-first order and pseudo-second order models. The pseudo-second order model was found to explain the kinetics of beta-carotene adsorption more effectively (R-2 = 0.9882). The highest beta-carotene reduction was achieved (from 31.9 to 1.84 mg/kg) at an AC dosage of 10 wt%, temperature of 50 degrees C, and adsorption time of 240 min. A considerable amount of alpha-tocopherol was also adsorbed during the AC treatment. Remaining portions of alpha-tocopherol were completely removed with alumina adsorption chromatography. The method described may be used for purification of vegetable oil TAGs, which will be used as model compounds in model oxidation studies.
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    Preparation, structural evaluation and adsorptive properties of activated carbon from agricultural waste biomass
    (Elsevier Science Bv, 2015) Koseoglu, Eda; Akmil-Basar, Canan
    The purpose of this study is to produce the low-cost activated carbon from the orange peel, known as a waste of fruit juice industry, by chemical activation using zinc chloride (ZnCl2) and potassium carbonate (K2CO3). The effects of the activation temperature and type of activation reagents on the surface and chemical properties of activated carbon were investigated. The activation temperatures and impregnation ratios were selected at the range of 500-1000 degrees C and 1:1, respectively. The carbon content of activated carbons resulted 70% while BET surface area of activated carbons prepared with K2CO3 and ZnCl2 activation is 1352 m(2) g (1) and 1215 m(2) g (1), respectively. An increase in the temperature for both K2CO3 and ZnCl2 led to a decrease in the yields of the activated carbons. The yield of ZnCl2 series is higher than that of K2CO3. The obtained activated carbons were heterosporous with the micropore. (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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    STUDIES ON REMOVAL OF NAPROXEN SODIUM BY ADSORPTION ONTO ACF IN BATCH AND COLUMN
    (Parlar Scientific Publications (P S P), 2012) Sarici-Ozdemir, Cigdem; Onal, Yunus; Erdogan, Selim; Akmil-Basar, Canan
    In this study, activated carbon fibers were prepared from textile waste by chemical activation with ZnCl2 (and coded IPZN1, IPZN2, and IPZN3). After preparation they were characterized by analyses using the BET surface area, FT-IR, and XRD methods. The ability of IPZN1, to remove naproxen sodium from effluent solutions by adsorption was studied. Results were analyzed by the Langmuir, Freundlich, Dubinin-Radushkevich (D-R), Temkin, Frumkin, Halsey and Henderson equations using linearized correlation coefficients at 298 K. The value of Q(0) was determined as 294.11 mg.g(-1) and the Delta G value of -21.46 kJ.mol(-1) for adsorption of naproxen sodium. The fixed-bed adsorption system was used for study of the adsorption of naproxen sodium onto IPZN1. Experiments were conducted to study the effect of flow rate of naproxen sodium. Decreasing the flow rate was found to enhance capacity. The breakthrough data obtained for naproxen sodium was adequately described by the Thomas and Yoon-Nelson adsorption models. This study revealed that ACF is suitable for use as an effective adsorbent for the adsorption of naproxen sodium.
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    Utilization potential lignocellulosic waste biomass to produce carbon support by using new activation reagent (H3BO3 and SrCl2): structural and adsorptive properties
    (Taylor & Francis Inc, 2016) Akmil-Basar, Canan; Koseoglu, Eda; Onal, Yunus
    Activated carbons series were produced from the orange peel by chemical activation using strontium chloride (SrCl2) and boric acid (H3BO3). The activation temperature effects and type of activation reagents on the surface and chemical properties of activated carbon have been investigated. The surface area of the activated carbons is 577 and 290m(2) g(-1) for H3BO3 and SrCl2 activation(,) respectively. An increase in the temperature for both H3BO3 and SrCl2 led to a decrease in the yields of the activated carbons. The yield of H3BO3 series is higher than the yield of SrCl2. The obtained activated carbons were heteroporous with the mesopore. Orange peel can be used alternative waste biomass for the mesoporous activated carbon productions. Samples were characterized by XRD, SEM, FTIR, and TGA analysis.