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Correlations between photocatalytic activity and chemical structure of Cu-modified TiO2–SiO2 nanoparticle composites
Iztok 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.
Najdeno v: ključnih besedah
Ključne besede: Cu-modified TiO2–SiO2photocatalysts, Titanium dioxide, Metal doping, Cu K-edge XANES, EXAFS, Photocatalytic activitya
Objavljeno: 17.01.2017; Ogledov: 1379; Prenosov: 0
.pdf Polno besedilo (580,62 KB)

14.
EFFECT OF DIFFERENT LOADING CONCENTRATIONS OF Cu AND Zr METAL IONS ON PHOTOCATALYTIC ACTIVITY OF P25
Ikram Muhammad, magistrsko delo

Najdeno v: ključnih besedah
Povzetek najdenega: ...odpadne vode, degradacija, ki onesnažuje, organska predhodniki, TiO2 photocatalysis, fotokatalitsko aktivnost, Zr in Cu dopantov,...
Ključne besede: odpadne vode, degradacija, ki onesnažuje, organska predhodniki, TiO2 photocatalysis, fotokatalitsko aktivnost, Zr in Cu dopantov, superoksid anioni, hidroksilni radikal, metilen modro
Objavljeno: 06.02.2017; Ogledov: 1803; Prenosov: 138
.pdf Polno besedilo (2,94 MB)

15.
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, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: ključnih besedah
Povzetek najdenega: ...Cu-modified TiO2-SiO2, sol-gel, XANES, EXAFS...
Ključne besede: Cu-modified TiO2-SiO2, sol-gel, XANES, EXAFS
Objavljeno: 06.02.2017; Ogledov: 1164; Prenosov: 0
.pdf Polno besedilo (378,67 KB)

16.
Transparent titania-zirconia-silica thin films for self-cleaning and photocatalytic applications
Urška Lavrenčič Štangar, Vlasta Brezova, Nives Vodišek, Kandalam Ramanujachary, 2017, objavljeni znanstveni prispevek na konferenci

Najdeno v: ključnih besedah
Povzetek najdenega: ... TiO2, ZrO2, thin films, photocatalysis, mechanical stability...
Ključne besede: TiO2, ZrO2, thin films, photocatalysis, mechanical stability
Objavljeno: 13.03.2017; Ogledov: 1683; Prenosov: 5
.pdf Polno besedilo (1,46 MB)

17.
Transparent titania-zirconia thin films for self-cleaning and photocatalytic application
Vlasta Brezová, Kandalam Ramanujachary, Nives Vodišek, Urška Lavrenčič Štangar, 2016, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: 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.
Najdeno v: ključnih besedah
Povzetek najdenega: ...photocatalysis, ZrO2/ TiO2, thin films, self-cleaning, low-temperature, sol-gel process...
Ključne besede: photocatalysis, ZrO2/ TiO2, thin films, self-cleaning, low-temperature, sol-gel process
Objavljeno: 14.03.2017; Ogledov: 1549; Prenosov: 97
.pdf Polno besedilo (462,52 KB)

18.
Correlations between photocatalytic activity and Cu structure in Cu-modified TiO2-SiO2
T. Čižmar, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: ključnih besedah
Ključne besede: Titanium dioxide, Cu-modified, TiO2-SiO2, photocatalysts, photocatalytic activity, Cu K-edge XANES, EXAFS
Objavljeno: 26.06.2017; Ogledov: 1127; Prenosov: 0
.pdf Polno besedilo (641,42 KB)

19.
Chemical structure in Cu-modified TiO2-SiO2 nanocomposites calcined at 500 °C for 1 h in air
T. Čižmar, Iztok Arčon, Urška Lavrenčič Štangar, 2017, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: ključnih besedah
Ključne besede: Cu-modified TiO2-SiO2 photocatalysts, titanium dioxide, metal doping, Cu K-edge XANES, EXAFS, photocatalytic activity
Objavljeno: 22.08.2017; Ogledov: 10743; Prenosov: 0
Gradivo ima več datotek! Več...

20.
Design and evaluation of a compact photocatalytic reactor for water treatment
Urška Lavrenčič Štangar, Lev Matoh, Olena Pliekhova, Marko Kete, 2017, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...Photocatalysis, Photocatalytic ozonation, TiO2, Al2O3 monolith, LAS, PBIC, Reactive blue 19,...
Ključne besede: Photocatalysis, Photocatalytic ozonation, TiO2, Al2O3 monolith, LAS, PBIC, Reactive blue 19, Phenol
Objavljeno: 24.08.2017; Ogledov: 1312; Prenosov: 0
.pdf Polno besedilo (6,74 MB)

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