Browsing by Author "Genel, Y."

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Immobilization of Catalase Via Adsorption Into Natural and Modified Active Carbon Obtained From Walnut in Various Methods
(Academic Journals, 2009) Alkan, S.; Gur, A.; Ertan, M.; Savran, A.; Gur, T.; Genel, Y.
In the present work, the immobilization of catalase into natural active carbon and active carbon modified by hydrochloric acid was carried out. In the experimental section, the effects of pH, ionic strength and reaction temperature were chosen as parameters, with experiments performed in batch system. For the optimization of immobilization procedure, values of kinetic parameters were evaluated. It was observed that storage and operational stabilities of the enzyme increased with immobilization. The results obtained from experiments showed that active carbon is a valuable support for the adsorption of enzymes.
Kavak Ağacı Talaşına Borik Asit İmpregnasyon ile Elde Edilmiş Aktif Karbon (KB-A) ile Sulu Çözeltiden Ağır Metal Giderimi
(Gumushane University, 2023) Genel, Y.
In this study the removal of heavy metals Pb(II), Cr(III), Zn(II) and Co(II) in wastewater with activated carbon (KB-A) obtained by boric acid impregnation to poplar sawdust (K-S) grown in the Van region was investigated. The parameters affecting adsorption were examined and optimum values were determined. For this purpose, the effects of different parameters such as solution pH, KB-A dosage, contact time and metal concentration were studied for their effects on the removal of heavy metals. As a result of the adsorption process, It was observed that the adsorption of all metals decreased with increasing temperature. The adsorption process was found to follow the Langmuir and Freundlich models. The maximum adsorption capacity values were determined as 30.89 mg g-1 for Cr(III), 30.49 mg g-1 for Pb(II), 30.30 mg g-1 for Zn(II) and 27.70 mg g-1 for Co(II). According to the thermodynamic parameter results, the adsorption process was spontaneous, and the reaction followed a pseudo-second-order kinetic model. The KB-A adsorption ability showed a trend ordered from large to small as Cr(III)˃ Pb(II) ˃Zn(II) ˃ Co(II). © 2023, Gumushane University. All rights reserved.
On the Level of Academic Achievement of the Vocational School Students: the Effect of Motivation
(Sakarya University, 2017) Aydin, S.; Genel, Y.; Kahraman, K.; Tola, Y.; Of, M.; Mutlu, C.
Motivation, a positive effect that directs behavior toward a goal could be perceived as one of the most important psychological concepts in all area of the life especially in education. In this study, it was investigated the relationship between academic achievement and motivation of vocational school students according to gender and class parameters. 192 vocational school students from 4 different programs (accounting, business, chemistry, and construction) attended the Academic Motivation Scale (AMS) which was prepared by Vallerend (1992). The AMS consisted of 28 Likert-type scale questions related to intrinsic motivation, extrinsic motivation and amotivation. Findings of the study indicated that there was only one significant relationship that was between academic achievement and two intrinsic motivation subscales. Females had higher scores in all motivation types. Also, there was only significant differences between males and females for intrinsic motivation. And, according to departments, there was significant difference in motivation by department in extrinsic motivation. © The Turkish Online Journal of Educational Technology.
Supercritical Fluid Extraction of Cotton Stalks
(Taylor & Francis inc, 2010) Sener, Ue.; Genel, Y.; Saka, C.; Kilicel, F.; Kucuk, M. M.
Cotton stalks mill were converted to liquid products by using organic solvents (methanol, 1-butanol, and 2-butanol) with catalysts (5 or 10% borax or ulexite) and without catalyst in an autoclave at temperatures of 540, 560, and 580 K. The liquid products were extracted by liquid-liquid extraction (benzene and diethyl ether) . The yields from supercritical methanol (10% borax) , 1-butanol (10% borax) , and 2-b butanol (10% borax) conversions were 54.1, 66.8, and 28.0 (at 580 K) , respectively. In the noncatalytic run with methanol was 37.4 at the same temperature.