Browsing by Author "Kaskun, Songul"

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Enhancement of Biogas Production Using Sno2 Nanoparticle-Doped Mica Catalyst
(Springer Heidelberg, 2023) Kaskun, Songul; Calhan, Rahman; Akinay, Yuksel
Different additives are used to enhance the microbial activity and ensure the suitable environment for anaerobic microorganisms in anaerobic digestion (AD) process. This study aims to investigate biogas production activity by adding mica particles (MP) and SnO2 nanoparticles (NPs)-doped mica (MSnO2) preparing by co-precipitation. The morphological and structural investigations of particles prove that the SnO2 NPs have been successfully embedded on mica surface. The deposition of SnO2 on the mica surfaces contributes the catalytic performance which in turn improves biogas production. The concentration of MP and MSnO2 was adjusted to be 0.03 mg/L and 0.06 mg/L for the biogas production experiment. In batch experiments, the highest biogas production, biogas yield, and methane yield were obtained at MSnO2-1 (0.03 mg/L) with 6890.2 mL, 245.4 ml/gVS, and 162.3 mL CH4/gVS, respectively. The addition of 0.03 mg/L MSnO2 increased biogas yield by 18.1% and methane yield by 33%, in the light of the data acquired from this experimental study that MSnO2 and pristine mica can be used effectively to enhance biogas production from cattle manure (CM).
Improved Hydrogen Adsorption of Zno Doped Multi-Walled Carbon Nanotubes
(Pergamon-elsevier Science Ltd, 2020) Kaskun, Songul; Akinay, Yuksel; Kayfeci, Muhammet
Hydrogen storage is still one of the most important problems to improve hydrogen energy usage widespread. New materials capable of storing hydrogen with high efficiency must be introduced to overcome this problem. In recent years, addition of metals or inorganic compounds to multiwalled carbon nanotubes (MWCNTs) has been generally used for hydrogen uptake studies to enhance adsorption property of the nanotubes. In this study, Zinc oxide (ZnO) nanoparticles doped MWCNTs (ZnO-MWCNTs) have been produced as new reversible hydrogen storage materials, and we have investigated characterization of ZnO-MWCNTs by XRD, SEM, TGA, TEM and BET analyses. The functionalized MWCNTs and ZnO doped MWCNTs were subjected to hydrogenation step by dynamic gas sorption analyser under pressure of 5-50 bar. The hydrogen uptake capacities of the materials under different pressures were measured gravimetrically. It was indicated that by controlling the pressures for hydrogenation of ZnO-MWCNTs induces the spillover of ZnO nanoparticles in the layer of MWCNTs which in return with high hydrogen adsorption capacity. Consequently, the hydrogen adsorption of the functionalized MWCNTs (fMWCNTs) and the ZnO-MWCNTs were achieved to be 1.05 wt% and 2.7091 wt% under pressure of 50 bar as maximum. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.