1. Hydroxyl radical scavenging-based method for evaluation of TiO[sub]2 photocatalytic activityUrška Lavrenčič Štangar, Matija Strlič, Romana Cerc Korošec, Danijela Pucko, 2013, izvirni znanstveni članek Opis: Hydroxyl radical scavenging-based method for evaluation of TiO[sub]2 photocatalytic activity
Najdeno v: ključnih besedah
Povzetek najdenega: ... titanium dioxide, photocatalysis, N,N-(5-nitro-1,3-phenylene)bisglutaramide, radical sca...
Ključne besede: titanium dioxide, photocatalysis, N, N-(5-nitro-1, 3-phenylene)bisglutaramide, radical scavenger, HPLC
Objavljeno: 05.01.2016; Ogledov: 4298; Prenosov: 27
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2. Correlations between photocatalytic activity and chemical structure in copper doped TiO2-SiO2 with surface/incorporated Cu2+ sitesTihana Čižmar, Iztok Arčon, Urška Lavrenčič Štangar, 2016, objavljeni povzetek znanstvenega prispevka na konferenci Opis: Sol−gel method was used to synthesize copper doped TiO2-SiO2 with varied dopant concentrations using tetraisopropoxide (TTIP) and copper acetlyacetonate (CuAcAc) as titania and copper sources. Structural information of Cu cation incorporation and its chemical state in the coatings are determined with Cu K-edge EXAFS and XANES analysis. The correlations between chemical state of the Cu dopant and the photocatalytic properties of the new active coatings are discussed.
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Povzetek najdenega: ...dip-coating, titanium dioxide, metal doping, Cu K-edge XANES, photocatalytic...
Ključne besede: dip-coating, titanium dioxide, metal doping, Cu K-edge XANES, photocatalytic activity
Objavljeno: 07.07.2016; Ogledov: 4720; Prenosov: 0 |
3. PREPARATION AND CHARACTERIZATION OF HIGHLY PHOTOACTIVE COATINGS ON GLASS SUPPORTS FOR DEGRADATION OF PHARMACEUTICAL SUBSTANCE PARACETAMOL IN WATERLidija Sinovčić, 2016, magistrsko delo Opis: Pharmaceuticals in aquatic environment are considered as emerging environmental contaminants due to their constant presence, evironmental resistance and toxic effect they could have on aquatic organisms. Studies for Slovenia have shown the presence of pharmaceutical substances in waters to be comparable with published results of pharmaceutical water pollution in Europe. As conventional methods do not reach efficient pharmaceutical removal from water sources, more powerful and effective methods like heterogeneous photocatalysis using TiO2/UV have been implemented. Titanium dioxide coatings in silicate binder were prepared by the sol-gel process and deposited on a glass support with dip-coating technique. The films showed good quality and possibility of multiple use. The characterization of the films was performed with scanning electron microscope (SEM), x-ray diffraction (XRD) and hardness test (Elcometer 501 Pencil Hardness Tester). Effectiveness and quality of prepared TiO2 coatings for photodegradation of pharmaceutical compound paracetamol (PCT) were assessed during photocatalytic treatment and compared to photolysis, a process without presence of a catalyst. Photolysis caused substantial changes in paracetamol concentration between 120 and 180 minutes of irradiation where 92% of degradation was achieved, but with no changes in mineralization. Photocatalytic treatment was much faster and effective where 95% of paracetamol degraded within 90 minutes of UV irradiation and after prolonged irradiation time from 120 to 240 minutes also mineralization of paracetamol solution increased from 59% to 83%. Accordingly, toxicity decreased, but it was still not lower than in the starting PCT solution as it was shown by acute toxicity test on Daphnia magna aquatic organisms. The master thesis represents a step forward in studying photocatalytic removal of paracetamol from water, because to my knowledge all the published investigations on this pharmaceutical up to now include photocatalyst mostly in powder and not in immobilized form, which is more advantageous from application point of view.
Najdeno v: ključnih besedah
Povzetek najdenega: ...heterogeneous photocatalysis using TiO2/UV have been implemented. Titanium dioxide coatings in silicate binder were prepared...
Ključne besede: Pharmaceuticals, paracetamol, titanium dioxide, photocatalytic degradation, Daphnia magna.
Objavljeno: 14.09.2016; Ogledov: 5755; Prenosov: 280
 Polno besedilo (2,50 MB) |
4. Correlations between photocatalytic activity and chemical structure of Cu-modified TiO2–SiO2 nanoparticle compositesIztok Arčon, Urška Lavrenčič Štangar, T. Čižmar, 2016, izvirni znanstveni članek Opis: Copper-modified TiO2–SiO2photocatalysts were prepared by sol–gel method based on organic copper,silicon and titanium precursors. Copper concentration varied from 0.1 to 3.0 mol%. A widely appliedmodel reaction of photocatalytic oxidation of terephtalic acid (TPA) in water solution was used in order toevaluate the catalytic activities of elaborated samples. The crystal structures of the titania components ofall tested titania–silica species were studied using XRD analysis. The influence of Cu2+cation incorporationon the crystal structure of titania, as well as the chemical states and the neighbouring structures of coppercations, have been examined by means of Cu K-edge EXAFS and XANES analysis. The experimental datashow that there is a ten times increase in photocatalytic activity when TiO2–SiO2matrix is modified with0.1 mol% of Cu. It can be supposed that an enhancement of photocatalytic activity of low-concentratedcopper-modified titania–silica nanocomposites is probably due to a close attachment of Cu2+cationsto the surfaces of photocatalytically active TiO2nanoparticles. In this case, Cu2+cations may possiblyact as free electron traps reducing the intensity of recombination between opposite free charge carriers(electrons, holes) available at the photocatalyst’s surface.
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Povzetek najdenega: ...sol–gel method based on organic copper,silicon and titanium precursors. Copper concentration varied from 0.1 to... ...Cu-modified TiO2–SiO2photocatalysts, Titanium dioxide, Metal doping, Cu K-edge XANES, EXAFS, Photocatalytic...
Ključne besede: Cu-modified TiO2–SiO2photocatalysts, Titanium dioxide, Metal doping, Cu K-edge XANES, EXAFS, Photocatalytic activitya
Objavljeno: 17.01.2017; Ogledov: 4348; Prenosov: 0
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5. Photocatalytic degradation of gaseous toluene by using TiO2 nanoparticles immobilized on fiberglass clothAndraž Šuligoj, Ioana Cǎlin, Minoo Tasbihi, Mattia Fanetti, Urška Lavrenčič Štangar, 2017, izvirni znanstveni članek Najdeno v: ključnih besedah
Povzetek najdenega: ... Titanium dioxide, immobilization, toluene, fiberglass cloth, gaseous photocatalysis...
Ključne besede: Titanium dioxide, immobilization, toluene, fiberglass cloth, gaseous photocatalysis
Objavljeno: 25.01.2017; Ogledov: 3943; Prenosov: 0
Polno besedilo (1,85 MB) |
6. HETEROGENEOUS PHOTOCATALYTIC OXIDATION FOR THE REMOVAL OF BISPHENOL A FROM AQUEOUS SOLUTION OVER TiO2/GRAPHENE OXIDE (GO) BASED NANOCOMPOSITESAna Veternik, 2017, magistrsko delo Opis: 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.
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Povzetek najdenega: ...heterogeneous photocatalysis, titanium dioxide, graphene oxide, bisphenol A...
Ključne besede: heterogeneous photocatalysis, titanium dioxide, graphene oxide, bisphenol A
Objavljeno: 23.02.2017; Ogledov: 4853; Prenosov: 279
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7. Correlations between photocatalytic activity and Cu structure in Cu-modified TiO2-SiO2T. Čižmar, objavljeni povzetek znanstvenega prispevka na konferenci Najdeno v: ključnih besedah
Povzetek najdenega: ... Titanium dioxide, Cu-modified, TiO2-SiO2, photocatalysts, photocatalytic activity, Cu...
Ključne besede: Titanium dioxide, Cu-modified, TiO2-SiO2, photocatalysts, photocatalytic activity, Cu K-edge XANES, EXAFS
Objavljeno: 26.06.2017; Ogledov: 3580; Prenosov: 0
Polno besedilo (641,42 KB) |
8. Chemical structure in Cu-modified TiO2-SiO2 nanocomposites calcined at 500 °C for 1 h in airT. Čižmar, Iztok Arčon, Urška Lavrenčič Štangar, 2017, objavljeni povzetek znanstvenega prispevka na konferenci Najdeno v: ključnih besedah
Povzetek najdenega: ...Cu-modified TiO2-SiO2 photocatalysts, titanium dioxide, metal doping, Cu K-edge XANES, EXAFS,...
Ključne besede: Cu-modified TiO2-SiO2 photocatalysts, titanium dioxide, metal doping, Cu K-edge XANES, EXAFS, photocatalytic activity
Objavljeno: 22.08.2017; Ogledov: 13431; Prenosov: 0
Gradivo ima več datotek! Več...
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9. Role of Surface Cu-O-Zr Sites in the Photocatalytic Activity of TiO2 Nanoscale ParticlesNataša Novak Tušar, Iztok Arčon, Urška Lavrenčič Štangar, Olena Pliekhova, 2016, objavljeni povzetek znanstvenega prispevka na konferenci Najdeno v: ključnih besedah
Povzetek najdenega: ...Photocatalysis, Titanium dioxide, Copper, Zirconia, co-doping, EXAFS, XANES...
Ključne besede: Photocatalysis, Titanium dioxide, Copper, Zirconia, co-doping, EXAFS, XANES
Objavljeno: 23.08.2017; Ogledov: 3768; Prenosov: 0
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10. Crystal phase controlled synthesis of TiO2 nanoparticles by solution combustion methodOlena Pliekhova, Urška Lavrenčič Štangar, 2018, objavljeni znanstveni prispevek na konferenci Najdeno v: ključnih besedah
Povzetek najdenega: ...Solution combustion, titanium dioxide, carbohydrazide, chloride ion, fluoride ion...
Ključne besede: Solution combustion, titanium dioxide, carbohydrazide, chloride ion, fluoride ion
Objavljeno: 10.09.2018; Ogledov: 2595; Prenosov: 0
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