Repository of University of Nova Gorica

Search the repository
A+ | A- | Help | SLO | ENG

Query: search in
search in
search in
search in
* old and bologna study programme

Options:
  Reset


31 - 40 / 77
First pagePrevious page12345678Next pageLast page
31.
32.
Correlations between photocatalytic activity and Cu structure in Cu-modified TiO2-SiO2
T. Čižmar, published scientific conference contribution abstract

Keywords: Titanium dioxide, Cu-modified, TiO2-SiO2, photocatalysts, photocatalytic activity, Cu K-edge XANES, EXAFS
Published in RUNG: 26.06.2017; Views: 4490; Downloads: 0
This document has many files! More...

33.
Transparent titania-zirconia thin films for self-cleaning and photocatalytic application
Nives Vodišek, Kandalam Ramanujachary, Vlasta Brezová, Urška Lavrenčič Štangar, 2016, published scientific conference contribution abstract

Abstract: Thin films were prepared by sol-gel process, where different amount of zirconia were added to titania. Photocatalytic activity of thin films was measured by two methods i) determination of degradation ration of methyl stearate with measuring the contact angle and ii) formation of hydroxyterephthalic acid was measured by spectrofluorometer. Prepared samples were characterized by UV-Vis spectrophotometer, SEM, XRD, FT-IR ATR, and BET. The result of measurements of photocatalytic activity shows that the highest activity has a sample without addition of zirconia, but mechanical stability of that sample is worse.
Keywords: photocatalysis, ZrO2/ TiO2, thin films, self-cleaning, low-temperature, sol-gel process
Published in RUNG: 14.03.2017; Views: 5032; Downloads: 202
.pdf Full text (462,52 KB)

34.
Transparent titania-zirconia-silica thin films for self-cleaning and photocatalytic applications
Nives Vodišek, Kandalam Ramanujachary, Vlasta Brezova, Urška Lavrenčič Štangar, 2017, published scientific conference contribution

Keywords: TiO2, ZrO2, thin films, photocatalysis, mechanical stability
Published in RUNG: 13.03.2017; Views: 4976; Downloads: 5
This document has many files! More...

35.
Correlations between photocatalytic activity and chemical structure of Cu-modified TiO [sub] 2-SiO [sub] 2 nanoparticle composites
T. Čižmar, Iztok Arčon, Urška Lavrenčič Štangar, 2016, published scientific conference contribution abstract

Keywords: Cu-modified TiO2-SiO2, sol-gel, XANES, EXAFS
Published in RUNG: 06.02.2017; Views: 4113; Downloads: 0
This document has many files! More...

36.
37.
38.
Correlations between photocatalytic activity and chemical structure of Cu-modified TiO2–SiO2 nanoparticle composites
T. Čižmar, Urška Lavrenčič Štangar, Iztok Arčon, 2016, original scientific article

Abstract: 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.
Keywords: Cu-modified TiO2–SiO2photocatalysts, Titanium dioxide, Metal doping, Cu K-edge XANES, EXAFS, Photocatalytic activitya
Published in RUNG: 17.01.2017; Views: 5122; Downloads: 0
This document has many files! More...

39.
40.
Search done in 0.07 sec.
Back to top