Efect of amines on (peroxo)titanates: characterization and thermal decomposition

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F22%3A00543413" target="_blank" >RIV/61388980:_____/22:00543413 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/s10973-021-10925-w" target="_blank" >https://doi.org/10.1007/s10973-021-10925-w</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-021-10925-w" target="_blank" >10.1007/s10973-021-10925-w</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Efect of amines on (peroxo)titanates: characterization and thermal decomposition

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Efect of amines on (peroxo)titanates: characterization and thermal decomposition

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

1588-2926

Svazek periodika

147

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

14

Strana od-do

5009-5022

Kód UT WoS článku

000663699100011

EID výsledku v databázi Scopus

2-s2.0-85108268324