Solvothermal growth of {0 0 1} exposed anatase nanosheets and their ability to mineralize organic pollutants. The effect of alcohol type and content on the nucleation and growth of TiO2 nanostructures

Szymon Dudziak; Marta Kowalkińska; Jakub Karczewski; Marcin Pisarek; Katarzyna Siuzdak; Adam Kubiak; Katarzyna Siwińska-Ciesielczyk; Anna Zielińska-Jurek

doi:10.1016/j.apsusc.2021.150360

Solvothermal growth of {0 0 1} exposed anatase nanosheets and their ability to mineralize organic pollutants. The effect of alcohol type and content on the nucleation and growth of TiO2 nanostructures

Abstract

Herein, the series of {0 0 1} exposed anatase nanosheets from HF-assisted solvothermal growth synthesis were obtained. The two-dimensional TiO2 were characterized, including both bulk (XRD, DR-UV–Vis, Mott-Schottky) and surface characteristics (N2 sorption, XPS, SEM) with experimental results compiled with Density Functional Theory (DFT) calculations. The effect of alcohol amount and type was studied, demonstrating the crucial role of nucleation rate on the final material properties, which was connected with the possible ligand exchange between F− and ROH in the [TiF6]2− octahedra, leading to further TiO2 condensation through an ether elimination reaction. Highly active 2D nanoparticles were easily obtained for different reaction times when a moderate amount of n-butanol or n-hexanol was introduced to the synthesis. The photoactivity of 2D TiO2 with exposed {0 0 1} facet strongly depended on the photocatalytic available surface area with an increased amount of ortho–hydroxyphenol (catechol) formed as a by-product. Meanwhile, the rise of n-butanol or n-hexanol content during solvothermal reaction or changing it to ethanol allowed to form smaller and more crystalline anatase particles, but their activity was hindered. For these samples, the slow phenol disappearance and no catechol formation occurred due to (i) a lower amount of adsorbed fluorine, (ii) band position shifting towards lower values, and (iii) the surface presence of Ti3+, which prevented the generation of radical dotOH radicals. It was also found that changing the nucleation rate by modifying the reaction environment influences the fluorine ions distribution, determining the final properties of 2D structure photocatalyst.

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Authors (8)

Szymon Dudziak
Marta Kowalkińska mgr inż.
Jakub Karczewski dr hab. inż.
Marcin Pisarek
Katarzyna Siuzdak dr hab. inż.
Adam Kubiak
Katarzyna Siwińska-Ciesielczyk dr hab. inż.
Anna Zielińska-Jurek dr hab. inż.

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Articles

Type:

artykuły w czasopismach

Published in:

APPLIED SURFACE SCIENCE no. 563,
ISSN: 0169-4332

Language:

English

Publication year:

2021

Bibliographic description:

Dudziak S., Kowalkińska M., Karczewski J., Pisarek M., Siuzdak K., Kubiak A., Siwińska-Ciesielczyk K., Zielińska-Jurek A.: Solvothermal growth of {0 0 1} exposed anatase nanosheets and their ability to mineralize organic pollutants. The effect of alcohol type and content on the nucleation and growth of TiO2 nanostructures// APPLIED SURFACE SCIENCE -Vol. 563, (2021), s.150360-

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