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Öğe Adsorption of chromium(VI) metal ions from aqueous solution using hexagonal ZnO particles: Equilibrium, kinetic and thermodynamic modelling studies(Wiley, 2014) Erduran, Nuran; Gokgoz, Murat; Ada, KezbanZinc oxide powders having hexagonal plate particles were prepared by homogeneous precipitation from boiling aqueous solutions that contained excess urea and 0.075 (Z075) and 0.300 (Z300) M Zn2+. The equilibrium, kinetic and thermodynamics of the adsorption of chromium (VI) from aqueous solution onto Z075 and Z300 were investigated. Thermodynamic parameters and K-# equilibrium constant of activation were calculated. Langmuir, Temkin and Dubinin-Radushkevich (D-R) isotherm models were used to describe the adsorption of Cr(VI) onto ZnO powders. The monomolecular adsorption capacity of Z075 and Z300 was determined as 980 and 1050mgg(-1) for Cr(VI), respectively.Öğe Glycaemic index and glycaemic load of selected packaged vegan foods(Wiley, 2024) Gumus, Aylin Bayindir; Keser, Alev; Gokgoz, Murat; Gungunes, AskinWhile there are data regarding the glycaemic index (GI) and glycaemic load (GL) of many foods in the literature, the values for packaged vegan analogue foods have not been previously published, although processed vegan foods usually contain more carbohydrates than their animal-based counterparts. This study was carried out to determine the GI and GL values of a selection of packaged vegan foods popular in T & uuml;rkiye. To determine the GI and GL of test foods, 12 healthy volunteer females participated in the study. Participants randomly consumed test and reference foods (glucose and white bread) on each trial day, and capillary blood glucose was measured at baseline, 15, 30, 45, 60, 90 and 120 mins in duplicate. The GIs of vegan schnitzel, vegan chickpea burger, vegan mince pita, vegan chocolate, vegan snack bar and vegan cheese were 26.1 +/- 19.61 (low), 27.1 +/- 17.21 (low), 65.1 +/- 28.60 (moderate), 42.7 +/- 22.32 (low), 63.6 +/- 45.86 (moderate), 36.4 +/- 16.85 (low), respectively, according to the glucose reference, and were 28.2 +/- 16.17 (low), 34.7 +/- 18.26 (low), 81.2 +/- 31.96 (high), 48.8 +/- 12.87 (low), 82.0 +/- 54.05 (high), 46.7 +/- 28.66 (low), respectively, according to the white bread reference. GLs were 3.5 +/- 2.66 (low), 8.6 +/- 5.46 (low), 26.6 +/- 11.67 (high), 6.1 +/- 3.19 (low), 14.2 +/- 10.28 (moderate), 5.7 +/- 2.63 (low), respectively, according to the glucose reference, and were 3.8 +/- 2.19 (low), 11.0 +/- 5.80 (moderate), 33.1 +/- 13.04 (high), 7.0 +/- 1.84 (low), 18.4 +/- 12.12 (moderate), 7.3 +/- 4.47 (low), respectively, according to the white bread reference. The data from this study provide preliminary data for the GIs and GLs of packaged and processed vegan foods and show that the GIs and GLs of meat and cheese vegan analogues, while still low or moderate, tend to be higher than their animal-based counterparts which have lower or no glycaemic responses. Further research on the GIs and GLs of more vegan foods is needed.Öğe Immobilization of Saccharomyces cerevisiae on to modified carboxymethylcellulose for production of ethanol(Springer, 2011) Gokgoz, Murat; Yigitoglu, MustafaIn this work, modified carboxymethylcellulose (CMC) was used as a new support material for production of ethanol. Crosslinked graft copolymers of CMC with N-vinyl-2-pyrrolidone (N-VP) were prepared in different grafting yields. The beads material was characterized by means of fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), scanning electron microscope (SEM) and swelling experiment. Saccharomyces cerevisiae was immobilized using entrapment method in the graft copolymers of carboxymethylcellulose-g-poly(N-vinyl-2-pyrrolidone) (CMC-g-PVP) for ethanol fermentation. The effects of grafting yield, initial glucose concentration and crosslinker concentration on the yield of ethanol process were investigated. Reusability of the immobilized yeasts was investigated and found that the materials can be used four times without losing their activity. Ethanol production increased to 59.3 g/L from 46.4 g/L when percentage of N-VP in the graft copolymer was increased. The highest ethanol productivity was found to be 1.75-2.25 g/L h. Fermentation time decreased with the decreasing of crosslinker concentration. The results suggest that the proposed method for immobilization of Saccharomyces cerevisiae has potential in industrial applications for ethanol process.Öğe The dye adsorption and antibacterial properties of composite polyacrylamide cryogels modified with ZnO(Elsevier Science Inc, 2021) Inal, Murat; Erduran, Nuran; Gokgoz, MuratThe present study aimed to modify the surface of polyacrylamide cryogels (PAC) with ZnO nanorods (ZNR) to provide them with antibacterial properties. The synthesized ZNR-modified composite PAC (ZMC) characterized by AAS, FTIR, SEM, XRD, XPS, BET surface analysis and TGA studies. A study of the adsorption of Orange G (OG) and antibacterial effect was performed on the synthesized ZMC. The highest adsorption capacity was determined to be at a dye concentration of 142.79 mg/g at 400 ppm, and a pH of 2. From the data obtained, it was found that adsorption fitted the pseudo-second-order kinetic model and Freundlich isotherm. Modified cryogels could be desorbed in a very short time-such as 30 min-and reused approximately twenty times with 80% efficiency. While ZMC cryogels did not show antibacterial activity in the dark, inhibition percentages were determined as 99.79 +/- 3.94% and 99.81 +/- 1.76%, at 1.78 mg/mL cryogel application, MIC90 values were determined as 1.589 +/- 0.063 and 0.660 +/- 0.028 mg/ mL for Escherichia coli, and Staphylococcus aureus, respectively under visible light. The results showed that the composite cryogels obtained had a very high potential to be applied both in the removal of dyes from wastewater and in the purification of microorganism-contaminated water. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
