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Öğe Biohydrogen Production from Waste Substrates as a Clean Energy(Taylor & Francis Inc, 2012) Kahyaoglu, M.; Sahin, O.; Saka, C.Demand of energy is increasing continuously due to rapid development in industrialization, population, economic growth, and rising living standards. Therefore, energy production is very important for living things, human and industrial activities. Hydrogen is a clean energy that has a great potential to be an alternative fuel. Hydrogen is an environmentally friendly fuel that possesses a high energy yield, provides clean energy generation without pollution when burned in air, and produces no greenhouse gases when combusted. It is an odorless, colorless, tasteless, and non-poisonous gas. Hydrogen is a sustainable energy system, which is produced from available sources and is used in every application where fossil fuels are being used in transportation, residential, commercial, and industrial sectors, and for electricity generation. In nature, some microorganisms with biological processes can produce hydrogen gas. In this review, biohydrogen production from industrial waste substrate, microbial producers, bioprocessing strategies, and the recent developments are discussed with their relative advantages.Öğe Hydrogen generation from NaBH 4 solution with the high-performance Co(0) catalyst using a cold plasma method(Taylor and Francis Inc., 2014) Şahin, Ö.; Hansu, F.; Saka, C.; Baytar, O.The hydrogen production from the hydrolysis of NaBH4 with Co(0) catalyst, which is prepared with a cold plasma method under nitrogen atmosphere, was investigated with effects of NaBH4 and NaOH concentration, temperature, plasma applying time and applying power, and Co(0) catalyst effect. The hydrolysis reaction completed within around 10-min time intervals with cold plasma, while the hydrolysis reaction in the known method completed within around 20-min time intervals. The completion rate of hydrolysis reaction with Co(0) catalyst in cold plasma media compared to non-plasma media increased to be around 100%. The yield of hydrogen in the presence of 3.2, 10, and 25% NaBH4 solution takes the values of around 94, 90, and 15% at the end of 600 sec, respectively. The experimental data were fitted to first-order. The activation energy for first-order was found to be 26.02 kJ mol-1. © 2014 Taylor & Francis Group,LLC.Öğe Removal of Cu (II), Pb (II) and Cd (II) metal ions with modified clay composite: kinetics, isotherms and thermodynamics studies(Springer, 2023) Tegin, I; Batur, M. S.; Yavuz, O.; Saka, C.This study investigates a low-cost and economical raw and heat-treated clay sample as a potential adsorbent for a higher uptake of Cu(II), Pb(II) and Cd(II) ions from aqueous solutions. The characterization of the obtained raw and modified clay materials, X-ray fluorescence spectroscopy, thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy were carried out. Compared with the raw clay sample, the adsorption ability of metal ions with the heat-treated clay adsorbent was significantly improved. The effects of calcination temperature, initial metal concentration, solution temperature and contact time on adsorption capacity were investigated. Adsorption data were tested with Langmuir and Freundlich models, and the Langmuir model showed a relatively better fit. The adsorption capacities for Cu (II), Pb (II) and Cd (II) ions were found to be 156.25 mg/g, 172.40 mg/g and 9.15 mg/g, respectively. The adsorption data for heavy metal ions confirmed the pseudo-second-order kinetic model. Heat-treated clay samples showed remarkable adsorption efficiency for heavy metal removal from aqueous systems; therefore, it can be considered as a competent and potential adsorbent for heavy metal removal. [GRAPHICS]Öğe The effect of microwave irradiation on a Co-B-based catalyst for hydrogen generation by hydrolysis of NaBH4 solution(Bellwether Publishing, Ltd., 2015) Şahin, O.; Kaya, M.; Izgi, M.S.; Saka, C.A Co-B-based catalyst was prepared under microwave irradiation for hydrogen generation by hydrolysis of NaBH4 solution. The activity of Co-B catalyst for hydrogen generation was studied in comparison with another Co-B catalyst prepared by the known methods. The results show that Co-B catalyst reduced prepared under microwave irradiation was quick and was completed in only 17 min, while the Co-B catalyst produced in a known method was slow and was completed in 27 min. The hydrogen generation from the hydrolys of NaBH4 with Co-B catalyst was investigated depending on NaBH4 and NaOH concentrations in solution, temperature, microwave applying time, and microwave applying power. Hydrolysis kinetics of NaBH4 were investigated at a temperature range of 30-50°C and zero-order kinetics were applied to the obtained data. Copyright © Taylor & Francis Group, LLC.Öğe The Removal of Methylene Blue from Aqueous Solutions by Using Microwave Heating and Pre-boiling Treated Onion Skins as a New Adsorbent(Taylor & Francis Inc, 2012) Saka, C.; Sahin, O.; Celik, M. S.Varying the parameters, such as dye concentration, adsorbent dose, and pH, carried out the potential feasibility of microwave heating treated and pre-boiling treated onion skins for removal of methylene blue. The amount of dye uptake (mg g(-1)) was found to increase with an increase in contact time, adsorbent dosage, and in initial dye concentration. Lagergren first-order and second-order were used to fit the experimental data. Equilibrium isotherms were analyzed by Langmuir and Freundlich. Based on regression coefficient, the equilibrium data found fitted well to the Langmuir equilibrium model than other models. The adsorption capacities were found to be 142.67 and 55.55 mg g(-1) for microwave heating treated onion skins and pre-boiling treated onion skins by Langmuir isotherm. The equilibrium time was found to be 150 min for 50 mg L-1 dye concentrations. The maximum removals for microwave heating treated onion skins and pre-boiling treated onion skins were obtained 86.34 and 94.13% at natural pH 10.0 for adsorbent doses of 0.15 g/200 mL.
