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Efect of amines on (peroxo)titanates: characterization and thermal decomposition
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SYSNO ASEP 0543413 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Efect of amines on (peroxo)titanates: characterization and thermal decomposition Author(s) Komárková, Bára (UACH-T) RID, SAI, ORCID
Motlochová, Monika (UACH-T) SAI, RID, ORCID
Slovák, V. (CZ)
Ecorchard, Petra (UACH-T) SAI, RID, ORCID
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Bavol, Dmytro (UACH-T) SAI, RID, ORCID
Šubrt, Jan (UACH-T) SAI, RIDSource Title Journal of Thermal Analysis and Calorimetry. - : Akadémiai Kiadó - ISSN 1388-6150
Roč. 147, č. 8 (2022), s. 5009-5022Number of pages 14 s. Language eng - English Country HU - Hungary Keywords Thermal degradation ; Evolved gas analysis ; High temperature X-ray difraction ; (Peroxo)titanates ; TiO2 properties ; Amines Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry R&D Projects LM2018124 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA18-26297S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access with time embargo (20.06.2022) Institutional support UACH-T - RVO:61388980 UT WOS 000663699100011 EID SCOPUS 85108268324 DOI 10.1007/s10973-021-10925-w Annotation This report describes the thermal behaviour of nanotitania precursors and the infuence of various amines and peroxide treatment on properties of TiO2. Thermal degradation of amine-containing amorphous (peroxo)titanates was examined via TG–DTA coupled with evolved gas analysis (EGA) by mass spectrometry in inert and oxidizing atmosphere. Crystallization to anatase and subsequent transformation to rutile are studied by in situ HT-XRD, which provided information about particle growth and mutual ratio between allotropic phases. In argon, the samples underwent a two-step degradation process, involving the release of moisture and decomposition or evaporation of amine, up to 450 °C, while in air conditions, the organic component could be oxidized in an additional third step at even higher temperatures. EGA confrmed the presence of the original amine in the amino-titanates, while the organic parts reacted with oxygen evolved from the peroxide group to form oxidation products (H2O, CO2 and NOx). The crystallization of nanoanatase began simultaneously/subsequently with the second degradation step. While peroxide treatment increased the initial particle size (from 5 to 40 nm), the choice of amine had a signifcant impact on the anatase formation temperature (325–425 °C). The anatase particle size increased with higher formation temperature after H2O2 treatment, while the particle size of amino-titanates decreased. The rutile formation temperature was directly dependent on the anatase particle size. Hitherto prepared amine-treated (peroxo)titanates demonstrated good thermal endurance of anatase nanoparticles (800–900 °C), which could be advantageous for various photocatalytic applications. The obtained results provide a method to synthetize tailored TiO2 with desired properties by adjusting the synthetic conditions (selection of precipitation agent and peroxide treatment) and annealing temperatures. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2023 Electronic address https://doi.org/10.1007/s10973-021-10925-w
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