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  • Two new types of TiO2 photocatalysts were synthesised by precipitation from titanylsulphate solution by urea and compared with the commercial photocatalyst TiO2 P25 (Degussa). The photocatalysts were thermally treated at 300, 600 and 900degreesC and characterised by X-ray diffraction, specific surface area and pore distribution analyses, and scanning electron microscopy. New photocatalysts exhibit a rather large surface area (300 m(3) g(-1)) and small particle size (3-4 nm), and consist of round agglomerates (1-2 mum). Their photoactivity (degradation of oxalic acid and 4-chlorophenol) reached only about 60% of that of TiO2 P25 although they had a six times higher specific surface area. The possible reason could be a more efficient charge recombination in smaller TiO2 particles.
  • Two new types of TiO2 photocatalysts were synthesised by precipitation from titanylsulphate solution by urea and compared with the commercial photocatalyst TiO2 P25 (Degussa). The photocatalysts were thermally treated at 300, 600 and 900degreesC and characterised by X-ray diffraction, specific surface area and pore distribution analyses, and scanning electron microscopy. New photocatalysts exhibit a rather large surface area (300 m(3) g(-1)) and small particle size (3-4 nm), and consist of round agglomerates (1-2 mum). Their photoactivity (degradation of oxalic acid and 4-chlorophenol) reached only about 60% of that of TiO2 P25 although they had a six times higher specific surface area. The possible reason could be a more efficient charge recombination in smaller TiO2 particles. (en)
  • Dva nové typy fotokatalyzátorů TiO2, připravené srážením roztoku síranu titanylu močovinou, byly porovnány s komerčním fotokatalyzátorem TiO2 P25 (Degussa). Po syntéze byly fotokatalyzátory tepelně opracovány při 300, 600 a 900 °C. Následná charakterizace metodami XRD, SEM a BET ukázala, že nové fotokatalyzátory mají veliký specifický povrch (300 m3 g?1) a že jsou tvořeny kulovitými aglomeráty (o průměru 1-2 ?m) velmi malých částic (o velikosti 3-4 nm). I když je jejich specifický povrch ve srovnání s materiálem P25 šestinásobný, dosahují jen zhruba 60% jeho fotoaktivity (stanovené prostřednictvím fotokatalytické degradace kyseliny šťavelové a 4 chlorfenolu). Důvodem je zřejmě účinnější rekombinace nábojů v menších syntetizovaných částicích. (cs)
Title
  • The Effect of Thermal Treatment on the Properties of TiO2 Photocatalyst
  • The Effect of Thermal Treatment on the Properties of TiO2 Photocatalyst (en)
  • Ovlivnění vlastností fotokatalyzátoru TiO2 tepelným opracováním (cs)
skos:prefLabel
  • The Effect of Thermal Treatment on the Properties of TiO2 Photocatalyst
  • The Effect of Thermal Treatment on the Properties of TiO2 Photocatalyst (en)
  • Ovlivnění vlastností fotokatalyzátoru TiO2 tepelným opracováním (cs)
skos:notation
  • RIV/61388955:_____/04:00107640!RIV/2005/AV0/A54005/N
http://linked.open.../vavai/riv/strany
  • 333;339
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(GA104/02/0662), P(GA203/02/0983), Z(AV0Z4040901)
http://linked.open...iv/cisloPeriodika
  • 2/3
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 562074
http://linked.open...ai/riv/idVysledku
  • RIV/61388955:_____/04:00107640
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • TiO2; morphology; surface area (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • CH - Švýcarská konfederace
http://linked.open...ontrolniKodProRIV
  • [F41CBE4B2BDA]
http://linked.open...i/riv/nazevZdroje
  • Materials Chemistry and Physics
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 86
http://linked.open...iv/tvurceVysledku
  • Jirkovský, Jaromír
  • Krýsa, J.
  • Šubrt, Jan
  • Štengl, Václav
  • Keppert, M.
http://linked.open...n/vavai/riv/zamer
issn
  • 0254-0584
number of pages
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