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Novel synthesis of ZrxTi1-xOn mixed oxides using titanyl sulphate and pressurized hot and supercritical fluids, and their photocatalytic comparison with sol-gel prepared equivalents
Authors: Lang Jaroslav | Matějová Lenka | Troppová Ivana | Čapek Libor | Endres Jan | Daniš Stanislav
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Materials Research Bulletin
Publisher name: Pergamon-Elsevier Science Ltd.
Place: Oxford
Page from-to: 95-103
Titles:
Language Name Abstract Keywords
cze Nová syntéza ZrxTi1-xOn směsných oxidů využívající titanyl sulfát a stlačené horké a superkritické tekutiny, a jejich fotokatalytické srovnání s ekvivalenty připravenými sol-gel metodou ZrxTi1-xOn směsné oxidy s pěti různými molárními poměry Zr/Ti a jejich mateřské oxidy byly připraveny kombinací termální hydrolýzy s krystalizací po tlakem horké vody a sušením v superkritickém metanolu. Jejich fotoaktivita byla porovnána s ekvivalentními materiály získanými sol-gel metodou. TiO2-ZrO2 směsné oxidy; titanyl sulfát; krystalizace; susšení superkritickým metanolem; fotoaktivita
eng Novel synthesis of ZrxTi1-xOn mixed oxides using titanyl sulphate and pressurized hot and supercritical fluids, and their photocatalytic comparison with sol-gel prepared equivalents ZrxTi1-xOn mixed oxides with five various molar ratios of Zr:Ti and their parent oxides were prepared, combining thermal hydrolysis (H) with pressurized hot water crystallization and supercritical methanol drying. Their photoactivity was compared to equivalent materials prepared by sol-gel (G) method. Zr0.1Ti0.9On-G was the most photoactive mixed oxide, which showed significantly higher photoactivity than Zr0.1Ti0.9On-H. Higher photoactivity of Zr0.1Ti0.9On-G can be attributed to phase composition (anatase-brookite phase mixture) and smaller TiO2 anatase crystallite-size. The Zr dopation in TiO2 did not improve the photoactivity neither of sol-gel-synthetized, nor thermal hydrolysis-synthetized mixed oxides in AO7 photodegradation. Zr in higher loadings (>10 mol%) formed separate monoclinic and tetragonal ZrO2 and monoclinic zirconium titanates. Unlike Zr4+ ions in Zr doped TiO2 the separate monoclinic and tetragonal ZrO2 and monoclinic zirconium titanates did not serve as electron trapping centres but as electron-hole recombination centres. The Zr loading in TiO2 should be below 10 mol%. (C) 2017 Published by Elsevier Ltd. TiO2-ZrO2 mixed oxides; Titanyl sulphate; Pressurized water crystallization; Supercritical methanol drying; Photoactivity

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