Effect of MCAA Synthesis and Calcination Temperature on Heterojunction Formation and Photocatalytic Activity of Biphasic TiO2 (B/A)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU149240" target="_blank" >RIV/00216305:26620/23:PU149240 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s10562-023-04489-7" target="_blank" >https://link.springer.com/article/10.1007/s10562-023-04489-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10562-023-04489-7" target="_blank" >10.1007/s10562-023-04489-7</a>

Result language

angličtina

Original language name

Effect of MCAA Synthesis and Calcination Temperature on Heterojunction Formation and Photocatalytic Activity of Biphasic TiO2 (B/A)

Original language description

This study investigates the impact of calcination temperature and the use of monochloroacetic acid (MCAA) as a complexing agent during the synthesis of TiO2 heterojunctions on the photocatalytic performance of TiO2 containing a heterojunction of anatase (A) and brookite (B). The TiO2 samples were dried at 100 °C and subjected to calcination in the temperature range of 200–500 °C. As the calcination temperature increased, changes in chemical composition, phase composition, specific surface area, pore size distribution, and band gap energy were observed, influencing the photocatalytic behavior during Acid Orange (AO7) photodegradation. With increasing calcination temperature, the anatase content slightly increased to 81.8 wt.%, while the brookite content decreased. Additionally, the anatase crystallite size increased from 5 to 7 nm, and the brookite crystallite size increased from 8 to 11 nm. These phase changes were characterized by a slight decrease in the brookite/anatase (B/A) molar ratio from 0.27 to 0.22. Concurrently, the specific surface area of TiO2 samples decreased from 180 to 70 m2 g−1, accompanied by alterations in the pore size distribution. The decrease in photocatalytic activity was evident, as the apparent rate constant kapp of AO7 photodegradation declined from 2.1 × 10–3 min−1 (100 °C) to 0.7 × 10–3 min−1 (500 °C). This reduction was attributed to the partial destruction of anatase/brookite heterojunctions on the photocatalyst surface, which underwent changes in size and surface structure due to sintering. Moreover, the presence of Ti3+, Ti4+, Ti–O, and Ti–OH hydroxyl groups played a significant role in the degradation process. Overall, this investigation sheds light on the crucial role of calcination temperature in modulating the photocatalytic properties of TiO2 heterojunctions and highlights the importance of heterojunction in enhancing photocatalytic activity.

Czech name

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Czech description

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Type

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

CEP classification

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OECD FORD branch

21001 - Nano-materials (production and properties)

Project

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

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2023

Confidentiality

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

Name of the periodical

CATALYSIS LETTERS

ISSN

1011-372X

e-ISSN

1572-879X

Volume of the periodical

153

Issue of the periodical within the volume

11

Country of publishing house

US - UNITED STATES

Number of pages

21

Pages from-to

0-21

UT code for WoS article

001091447600004

EID of the result in the Scopus database

2-s2.0-85174628381