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Title: Novel synthesis of Zr{sub x}Ti{sub 1-x}O{sub n} mixed oxides using titanyl sulphate and pressurized hot and supercritical fluids, and their photocatalytic comparison with sol-gel prepared equivalents

Abstract

Highlights: • Novel preparation of Zr{sub x}Ti{sub 1-x}O{sub n} mixed oxides by using titanyl sulphate and pressurized hot water and supercritical methanol. • Comparison of photoactivity of prepared mixed oxides with sol-gel-prepared equivalents in Acid orange 7 photodegradation. • The highest photoactivity of TiO{sub 2}-H is attributed to small anatase crystallite-size. • The highest photoactivity of Zr{sub 0.1}Ti{sub 0.9}O{sub n}-G is attributed to the existence of anatase-brookite phase mixture and small anatase crystallite-size. • The optimum Zr loading in TiO{sub 2} is below 10·mol%. - Abstract: Zr{sub x}Ti{sub 1-x}O{sub n} 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. Zr{sub 0.1}Ti{sub 0.9}O{sub n}-G was the most photoactive mixed oxide, which showed significantly higher photoactivity than Zr{sub 0.1}Ti{sub 0.9}O{sub n}-H. Higher photoactivity of Zr{sub 0.1}Ti{sub 0.9}O{sub n}-G can be attributed to phase composition (anatase-brookite phase mixture) and smaller TiO{sub 2} anatase crystallite-size. The Zr dopation in TiO{sub 2} 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%)more » formed separate monoclinic and tetragonal ZrO{sub 2} and monoclinic zirconium titanates{sub .} Unlike Zr{sup 4+} ions in Zr doped TiO{sub 2} the separate monoclinic and tetragonal ZrO{sub 2} and monoclinic zirconium titanates did not serve as electron trapping centres but as electron-hole recombination centres. The Zr loading in TiO{sub 2} should be below 10 mol%.« less

Authors:
 [1];  [2]; ;  [1];  [3]; ;  [4]
  1. Institute of Environmental Technology, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba (Czech Republic)
  2. (Czech Republic)
  3. Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10 (Czech Republic)
  4. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, Prague 121 16 (Czech Republic)
Publication Date:
OSTI Identifier:
22730439
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 95; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DOPED MATERIALS; HOT WATER; METHANOL; MONOCLINIC LATTICES; OXIDATION; SOL-GEL PROCESS; SULFATES; TITANIUM OXIDES; ZIRCONIUM IONS; ZIRCONIUM OXIDES

Citation Formats

Lang, Jaroslav, Nanotechnology Centre, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Matějová, Lenka, Troppová, Ivana, Čapek, Libor, Endres, Jan, and Daniš, Stanislav. Novel synthesis of Zr{sub x}Ti{sub 1-x}O{sub n} mixed oxides using titanyl sulphate and pressurized hot and supercritical fluids, and their photocatalytic comparison with sol-gel prepared equivalents. United States: N. p., 2017. Web. doi:10.1016/J.MATERRESBULL.2017.07.023.
Lang, Jaroslav, Nanotechnology Centre, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Matějová, Lenka, Troppová, Ivana, Čapek, Libor, Endres, Jan, & Daniš, Stanislav. Novel synthesis of Zr{sub x}Ti{sub 1-x}O{sub n} mixed oxides using titanyl sulphate and pressurized hot and supercritical fluids, and their photocatalytic comparison with sol-gel prepared equivalents. United States. doi:10.1016/J.MATERRESBULL.2017.07.023.
Lang, Jaroslav, Nanotechnology Centre, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Matějová, Lenka, Troppová, Ivana, Čapek, Libor, Endres, Jan, and Daniš, Stanislav. Wed . "Novel synthesis of Zr{sub x}Ti{sub 1-x}O{sub n} mixed oxides using titanyl sulphate and pressurized hot and supercritical fluids, and their photocatalytic comparison with sol-gel prepared equivalents". United States. doi:10.1016/J.MATERRESBULL.2017.07.023.
@article{osti_22730439,
title = {Novel synthesis of Zr{sub x}Ti{sub 1-x}O{sub n} mixed oxides using titanyl sulphate and pressurized hot and supercritical fluids, and their photocatalytic comparison with sol-gel prepared equivalents},
author = {Lang, Jaroslav and Nanotechnology Centre, VŠB – Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba and Matějová, Lenka and Troppová, Ivana and Čapek, Libor and Endres, Jan and Daniš, Stanislav},
abstractNote = {Highlights: • Novel preparation of Zr{sub x}Ti{sub 1-x}O{sub n} mixed oxides by using titanyl sulphate and pressurized hot water and supercritical methanol. • Comparison of photoactivity of prepared mixed oxides with sol-gel-prepared equivalents in Acid orange 7 photodegradation. • The highest photoactivity of TiO{sub 2}-H is attributed to small anatase crystallite-size. • The highest photoactivity of Zr{sub 0.1}Ti{sub 0.9}O{sub n}-G is attributed to the existence of anatase-brookite phase mixture and small anatase crystallite-size. • The optimum Zr loading in TiO{sub 2} is below 10·mol%. - Abstract: Zr{sub x}Ti{sub 1-x}O{sub n} 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. Zr{sub 0.1}Ti{sub 0.9}O{sub n}-G was the most photoactive mixed oxide, which showed significantly higher photoactivity than Zr{sub 0.1}Ti{sub 0.9}O{sub n}-H. Higher photoactivity of Zr{sub 0.1}Ti{sub 0.9}O{sub n}-G can be attributed to phase composition (anatase-brookite phase mixture) and smaller TiO{sub 2} anatase crystallite-size. The Zr dopation in TiO{sub 2} 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 ZrO{sub 2} and monoclinic zirconium titanates{sub .} Unlike Zr{sup 4+} ions in Zr doped TiO{sub 2} the separate monoclinic and tetragonal ZrO{sub 2} and monoclinic zirconium titanates did not serve as electron trapping centres but as electron-hole recombination centres. The Zr loading in TiO{sub 2} should be below 10 mol%.},
doi = {10.1016/J.MATERRESBULL.2017.07.023},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 95,
place = {United States},
year = {2017},
month = {11}
}