71. Recent advances in 2D imaging of element distribution in Plants by focused beam techniquesKatarina Vogel-Mikuš, Johannes Teun van Elteren, Marjana Regvar, Jitrin Chaiprapa, Boštjan Jenčič, Iztok Arčon, Alojz Kodre, Peter Kump, Anja Kavčič, Mitja Kelemen, Dino Metarapi, Marijan Nečemer, Primož Vavpetič, Primož Pelicon, Paula Pongrac, 2019, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Ključne besede: 2D Imiging, XRF, XANES, synchrotron light Objavljeno v RUNG: 05.09.2019; Ogledov: 3395; Prenosov: 0 Gradivo ima več datotek! Več... |
72. New Insights into Manganese Local Environment in MnS-1NanocrystalsAlenka Ristić, Matjaž Mazaj, Iztok Arčon, Nina Daneu, Nataša Zabukovec Logar, Roger Glaser, Nataša Novak Tušar, 2019, izvirni znanstveni članek Opis: Manganese plays an important role in redox catalysis using zeolites as inorganic support materials, but the formation of the preferred redox manganese species (framework or extraframework) is still not well understood. Herein, the influence of the amount of manganese together with conventional and microwave-assisted hydrothermal synthesis paths on the formation of manganese species within the zeolite silicalite-1 (S-1) with MFI structure was investigated. It was found out that both synthesis procedures led to the formation of framework and extraframework manganese species, but in different molar ratios. However, the conventional synthesis procedure with all Mn/Si molar ratios generates more framework Mn in comparison to the microwave procedure. Additionally, the diminution of the zeolite crystals to nanoscale from 100 to 200 nm was achieved via the conventional procedure for the first time. UV–vis, Raman, and X-ray absorption spectroscopic analyses revealed different local environments of manganese: Mn3+ incorporated into the silicalite-1 framework as “framework manganese” and Mn2+/3+ present as “extraframework manganese” (Mn2O3, Mn3O4). TEM reveals the presence of Mn3O4 nanorods. Both framework manganese and extraframework manganese exhibit good catalytic activity for styrene epoxidation. Catalytic results suggest that, in oxidation reactions of hydrocarbons, framework manganese is more active at lower Mn contents (Mn/Si < 0.015), whereas extraframework manganese is more active at higher loadings (Mn/Si > 0.015). Ključne besede: MnS-1 Nanocrystals, Mn XANES, EXAFS, zeolites, microwave-assisted hydrothermal synthesis Objavljeno v RUNG: 06.05.2019; Ogledov: 3560; Prenosov: 0 Gradivo ima več datotek! Več... |
73. A Biogenerated Polymetallic Catalyst from Society's WastesOreste Piccolo, Stefano Paganelli, Petro Zanatta, Sebastiano Tieuli, Laura Sperni, Franco Baldi, Iztok Arčon, Michele Gallo, Katarina Vogel-Mikuš, 2019, izvirni znanstveni članek Opis: Aims:Preparation of the new metals - polymeric composite, Met x-EPS (I), to be used as a green catalyst in water or in two-phase aqueous conditions.
Study Design:
Recovery and valorization of polymetallic
wastes to obtain directly new catalysts
using a microorganism to explore their application in removal of difficult and dangerous chemical
pollutants present in aqueous environment Ključne besede: Metals
-
polymeric composite, biogenerated polymetallic exopolysaccharide, new catalyst
from metallic wastes, hydrodechlorination
of PCBs in water Objavljeno v RUNG: 06.05.2019; Ogledov: 3557; Prenosov: 0 Gradivo ima več datotek! Več... |
74. Alternative Recovery and Valorization of Metals from Exhausted Catalytic Converters in a New Smart Polymetallic CatalystSebastiano Tieuli, Franco Baldi, Iztok Arčon, Katarina Vogel-Mikuš, Michele Gallo, Laura Sperni, Oreste Piccolo, Stefano Paganelli, 2019, izvirni znanstveni članek Opis: A new metals-polymeric composite, Metx-EPS (I), was prepared
to be used as catalyst in water or in two-phase aqueous
conditions. The metals source was an exhausted catalytic
converter that was grinded and treated with an acidic solution at room temperature. After filtration, the solution was concentrated, neutralized and added to a broth of Klebsiella oxytoca DSM 29614 to produce (I) where metals are embedded in a peculiar polysaccharide structure (EPS). The composite was easily recovered from the fermentation broth and purified. The process protocol was verified many times and was shown to be reproducible satisfactorily. The % recovery of metals, originally present in the converter, was good as determined by atomic
absorption. The morphology and the chemical state of main
metals in (I) were investigated by X-ray absorption spectroscopy
methods (XANES and EXAFS). No metallic alloy seems to
be evident. The catalytic activity and a possible synergic effect due to the presence of the different metals was valuated in the hydrogenation of some substrates, valuable precursors for theproduction of fine chemicals. Ključne besede: Biogenerated polymetallic exopolysaccharide, biphasic catalysis, hydrogenation, metals-polymeric
composite, new catalyst from metallic wastes, EXAFS, XANES Objavljeno v RUNG: 06.05.2019; Ogledov: 3421; Prenosov: 0 Gradivo ima več datotek! Več... |
75. Artist Talk : Predstavitve in diskusije o umetnosti v širšem družbenem kontekstuTilen Žbona, Iztok Šušteršič, Narvika Bovcon, Maja Smrekar, Aleš Vaupotič, druga izvedena dela Opis: Okrogla miza o umetnosti v širšem družbenem kontekstu. Galerija Loža, Koper, 11. 4. 2019. Del cikla "SPEKULA - Na prelomu upodobitve/At the edge of the depiction", raziskovalno, kulturno-umetniških dogodkov, ki jih organizira Pedagoška fakulteta Univerze na Primorskem.. Ključne besede: novomedijska umetnost, umetnost in znanost, digitalna humanistika, angažirana umetnost Objavljeno v RUNG: 15.04.2019; Ogledov: 3457; Prenosov: 0 Gradivo ima več datotek! Več... |
76. Synthesis of a Cu/ZnO Nanocomposite by Electroless Plating for the Catalytic Conversion of CO2 to MethanolMaja Pori, Iztok Arčon, Damjan Lašič Jurković, Marjan Marinšek, Goran Dražić, Blaž Likozar, Zorica Crnjak Orel, 2019, izvirni znanstveni članek Opis: 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. Ključne besede: EXAFS, CuZn alloy, Spillover mechanism, CO2 valorization, Electroless deposition method, Heterogeneous
catalysis Objavljeno v RUNG: 12.04.2019; Ogledov: 3771; Prenosov: 0 Gradivo ima več datotek! Več... |
77. Unraveling the arrangement of Al and Fe within the framework explains the magnetism of mixed-metal MIL-100(Al,Fe)Gregor Mali, Matjaž Mazaj, Iztok Arčon, Darko Hanžel, Denis Arčon, Zvonko Jagličić, 2019, izvirni znanstveni članek Opis: Properties of mixed-metal MOFs depend on the distribution of different
metals within their frameworks. Determination of this distribution is often very
challenging. Using an example of aluminum- and iron-containing MIL-100, we
demonstrate that 27Al NMR spectroscopy, when combined with first-principles
calculations and magnetic, X-band electron paramagnetic resonance, Fe K-edge extended
X-ray absorption fine structure, and Mössbauer measurements, enables one to accurately
determine the arrangement of Al and Fe within the metal trimers, which are the basic
building units of MIL-100. In this particular material, the incorporation of Fe and Al on
the framework metal sites is random. Crucial for deciphering the arrangement is detecting
NMR signals, shifted because of the strong hyperfine interaction between the 27Al nuclei
and the unpaired electronic spins of Fe3+ ions, assigning the shifted signals aided by first-principles calculations of hyperfine
couplings, and quantitatively evaluating the NMR intensities and the measured effective magnetic moment. Ključne besede: Fe EXAFS, XANES, MIL100, MOF, magnetizem Objavljeno v RUNG: 26.03.2019; Ogledov: 3416; Prenosov: 0 Gradivo ima več datotek! Več... |
78. Cu and Zr surface sites in photocatalytic activity of TiO [sub] 2 nanoparticles : the effect of Zr distributionOlena Pliekhova, O. L. Pliekhov, Mattia Fanetti, Iztok Arčon, Nataša Novak Tušar, Urška Lavrenčič Štangar, 2019, izvirni znanstveni članek Opis: The present work is focused on the role of ZrO2 modification in the performance of CuO modified TiO2. Zirconia
loading leads to formation of more resistant photocatalytic layers compared to samples modified with only
copper containing species. Surface modification of mixed phase TiO2 with CuO/ZrO2 improves the degradation
of Reactive blue 19 dye under simulated solar irradiation. An in-depth investigation of the catalysts showed that
in case of CuO/ZrO2 modification, the covering of the TiO2 surface with zirconium containing species prevents
morphological and harmful energetic changes induced by copper species formed on the rutile TiO2 phase at a
higher copper loading. Ključne besede: titanium dioxide, surface modification, XAS analysis, surface acidity, Hammett indicators Objavljeno v RUNG: 26.03.2019; Ogledov: 3356; Prenosov: 0 Gradivo ima več datotek! Več... |
79. Komunikacija vinske industrije na spletnih družbenih omrežjih v SlovenijiKarlo Kopjar, 2018, diplomsko delo Opis: V svetovni vinski industriji je veliko zanimanja za tržno komunikacijo vinske industrije na družbenih omrežjih. Tak način komunikacije je relativno poceni in ob dobri uporabi učinkovit. Kot za vse tipe tržne komunikacije je tudi za tak tip komunikacije potrebno imeti strategijo. Ponujenih nam je več družbenih omrežij, a niso vsa primerna za komunikacijo z našimi strankami oziroma potencialnimi strankami. Slovenija je tradicionalna pridelovalka vina in zato so prebivalci skoraj neprestano v stiku z vinsko kulturo. Slovenci se zanimajo za uživanje domačih in kakovostnih izdelkov. V času višje stopnje brezposelnosti se je zmanjšalo uživanje vina, a je sedaj stanje spet normalno. Tako je primerno komunicirati s Slovenci o vinu na družbenih omrežjih. Zakoni pa omogočajo, da je tak tip komunikacije skoraj neoviran. Z anketo smo iskali odgovore na vprašanja o uporabi družbenih omrežij in uživanju vina. Anketiranci so pokazali zanimanje za že tradicionalne vsebine o vinu. Ugotovili smo, da so ženske bolj primerna ciljna skupina za več različnih tipov vin kot moški. Možno je povzeti, da se družbena omrežja glede vina uporabljajo bolj za to, da spomnijo nekega potrošnika, kot da ga prepričajo, saj se ti bolj zanašajo na priporočila drugih kot na kak drug vir informacij. Ključne besede: vino, družbena omrežja, tržno komuniciranje, končni potrošniki, Slovenija Objavljeno v RUNG: 16.01.2019; Ogledov: 4822; Prenosov: 148 Celotno besedilo (2,00 MB) |
80. Spremljanje, ugotavljanje in zagotavljanje kakovosti : poročilo za študijsko leto 2017/2018 : Univerza v Novi Gorici, Fakulteta za znanosti o okolju.Iztok Arčon, Blaž Belec, Marina Artico, Tea Stibilj Nemec, Nivec Štefančič, Maja Terčon, Matjaž Valant, Sabina Zelinšček, elaborat, predštudija, študija Ključne besede: samoevalvacijsko poročilo Objavljeno v RUNG: 20.12.2018; Ogledov: 3876; Prenosov: 0 Gradivo ima več datotek! Več... |