Optimization of pressurized water and pressurized/supercritical methanol processing of Zr0.1Ti0.9On mixed oxide designed for mitigation of model dye Acid orange 7-polluted water

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F17%3A10238174" target="_blank" >RIV/61989100:27710/17:10238174 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Optimization of pressurized water and pressurized/supercritical methanol processing of Zr0.1Ti0.9On mixed oxide designed for mitigation of model dye Acid orange 7-polluted water

Original language description

This contribution deals with preparation of titanium- and zirconium-based mixed oxide with the molar ratio of Ti:Zr = 9:1 (i.e. Zr0.1Ti0.9On mixed oxide) by using pressurized water and pressurized/supercritical methanol, its physico-chemical characterization and investigation of its photocatalytic activity in model azo-dye Acid orange 7 photocatalytic discoloration. The preparation of Zr0.1Ti0.9On mixed oxide via using pressurized/supercritical fluids was optimized in such way to prepare the most photoactive material. The gel precursor of Zr0.1Ti0.9On mixed oxide, undergoing the processing by pressurized/supercritical fluids, was prepared by using sol-gel method controlled within the reverse micelles environment of nonionic surfactant Triton X-114 in cyclohexane. The gel precursor was subsequently processed by pressurized water and pressurized or supercritical methanol, depending on used processing conditions. The effect of parameters of the processing (i.e. volume of water used for crystallization, temperature and pressure) on the purity, textural, structural and microstructural properties of Zr0.1Ti0.9On mixed oxide was investigated. The physico-chemical properties of prepared Zr0.1Ti0.9On mixed oxides were determined by using organic elementary analysis, nitrogen physisorption and Raman spectroscopy. The mixed oxide photocatalytic activity was studied in photocatalytic discoloration of Acid orange 7 in a laboratory scale in batch regime under 365 nm UV light. It was found the temperature is the key processing parameter, influencing crucially material properties and, thus, photoactivity. Negligible effects of used water amount for crystallization and pressure were, surprisingly, revealed. While at higher processing temperatures (150 – 250 °C) TiO2 anatase of larger anatase crystallite-size appeared, at 100 °C TiO2 anatase-brookite mixture crystallized. The increase in processing temperature led also to higher purity of Zr0.1Ti0.9On mixed oxide. The optimal processing parameters leading to the most photoactive Zr0.1Ti0.9On mixed oxide in AO7 discoloration were found to be: 2 L of water used, 100 °C and 20 MPa.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/LO1208" target="_blank" >LO1208: Theoretical aspects of Energetic treatment of Waste and Environment Protection against negative impacts</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

Waste Forum

ISSN

1804-0195

e-ISSN

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Volume of the periodical

2

Issue of the periodical within the volume

June

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

13

Pages from-to

64-76

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85031116528