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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

1588-2926

Volume of the periodical

147

Issue of the periodical within the volume

8

Country of publishing house

HU - HUNGARY

Number of pages

14

Pages from-to

5009-5022

UT code for WoS article

000663699100011

EID of the result in the Scopus database

2-s2.0-85108268324