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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F17%3A10237585" target="_blank" >RIV/61989100:27640/17:10237585 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/17:10364369 RIV/61989100:27710/17:10237585 RIV/00216275:25310/17:39911955

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0025540817304920" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0025540817304920</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.materresbull.2017.07.023" target="_blank" >10.1016/j.materresbull.2017.07.023</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 (&gt;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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 (&gt;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA14-23274S" target="_blank" >GA14-23274S: Nekonvenční příprava nanostrukturovaných oxidů kovů pomocí přetlakových a superkritických tekutin</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Research Bulletin

ISSN

0025-5408

e-ISSN

—

Svazek periodika

95

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

95-103

Kód UT WoS článku

000412378500012

EID výsledku v databázi Scopus

2-s2.0-85025697953