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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

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

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

CATALYSIS LETTERS

ISSN

1011-372X

e-ISSN

1572-879X

Svazek periodika

153

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

21

Strana od-do

0-21

Kód UT WoS článku

001091447600004

EID výsledku v databázi Scopus

2-s2.0-85174628381