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* old and bolonia study programme


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Ana Veternik, 2017, master's thesis

Abstract: Since water is an essential substance for all life on earth, it is therefore vital to prevent its pollution and to improve wastewater purification processes. There is a vast number of pollutants which can contaminate water, of which bisphenol A (known as an endocrine disruptor) is the pollutant studied herein. In this study, several TiO2/GO based nanocomposites with various GO loadings (2, 4, 10, 20 and 40%) and differently shaped nanocrystalline TiO2 phases (titanate nanotubes (TNTs) and calcined titanate nanotubes (TNTs_500)) were synthesised. All of the nanocomposites were characterised through SEM, UV-vis-DR, TGA, BET, FT-IR and CHNS analyses and were used in the heterogeneous photocatalytic degradation of bisphenol A and compared to the activity of pure TNTs and TNT_500 photocatalysts. All TiO2/GO nanocomposites exhibit much better activity than pure TNTs and TNTs_500 catalysts. The conversion of the BPA was analysed using HPLC and the mineralisation was analysed using a TOC analysis. The best experiment was performed with TNTs_500 + 10% GO composite, which can be attributed to the TiO2 crystalline structure obtained. According to the results obtained, TiO2 + 10% GO was found to exhibit the best degradation ratio, which can be ascribed to the fact that excessive GO can act as a charge carrier recombination centre and promotes the recombination of electron-hole pairs in reduced GO.
Found in: ključnih besedah
Keywords: heterogeneous photocatalysis, titanium dioxide, graphene oxide, bisphenol A
Published: 23.02.2017; Views: 3148; Downloads: 226
.pdf Fulltext (2,96 MB)

Synthesis of a Cu/ZnO Nanocomposite by Electroless Plating for the Catalytic Conversion of CO2 to Methanol
Maja Pori, Iztok Arčon, Marjan Marinšek, Goran Dražić, Blaž Likozar, Zorica Crnjak Orel, Damjan Lašič Jurković, 2019, original scientific article

Abstract: The process of methanol synthesis based on the hydrogenation of CO2 was investigated over binary Cu/ZnO catalyst materials, prepared by applying a novel electroless plating fabrication method. The activity of the produced catalytic samples was determined at temperature range between 200 and 300 °C and the feedstock conversion data were supplemented with a detailed microstructure analysis using high-resolution transmission electron microscopy (HRTEM), X-ray powder diffraction (XRD) and Cu and Zn K-edge, X-ray absorption near-edge structure (XANES) measurements and extended X-ray absorption fine-structure (EXAFS) measurements. It was confirmed that the disorder in the Cu crystallites created unique geometrical situations, which acted as the additional reactive centres for the adsorption of the reactant molecule species. Copper and zinc structural synergy (spill-over) was also demonstrated as being crucial for the carbon dioxide’s activation. EXAFS and XANES results provide strong evidence for surface alloying between copper and zinc and thus the present results demonstrate new approach applicable for explaining metal–support interactions.
Found in: ključnih besedah
Keywords: EXAFS, CuZn alloy, Spillover mechanism, CO2 valorization, Electroless deposition method, Heterogeneous catalysis
Published: 12.04.2019; Views: 1402; Downloads: 0
.pdf Fulltext (1,92 MB)

Raspredelenie predprinimatel'skih sposobnostej i migracija
Alexander Shapoval, D. A. Pokrovskij, 2015, original scientific article

Abstract: The authors define a general equilibrium model with heterogeneous individuals who are endowed with identical preferences, given by the utility function with constant elasticity of substitution (CES), and with heterogeneous entrepreneurial skills. We find that scale effects linked to migration can be analyzed within the framework of the constructed model because the migration changes the market size together with a market structure. A population growth due to immigration of low-qualified individuals ambiguously affects the share of reciprocal to entrepreneurial   and the inequality in the economy. If the distribution of the inverse entrepreneurial skills has an increasing (decreasing, constant) elasticity, then   decreases (increases, and does not change) and the Gini coefficient increases (decreases and does not change).
Found in: ključnih besedah
Keywords: monopolistic competition, heterogeneous consumers, entrepreneurship, migration, income inequality, welfare
Published: 10.06.2021; Views: 71; Downloads: 0
.pdf Fulltext (515,03 KB)

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