Influence of substituted acetic acids on 'bridge' synthesis of highly photocatalytic active heterophase TiO2 in hydrogen production

0569351 - ÚSMH 2024 RIV US eng J - Článek v odborném periodiku
Cihlář, J. - Navarro, L. K. T. - Cihlář, Jaroslav - Kašpárek, V. - Michalička, J. - Částková, K. - Lazar, I. - Kaštyl, J. - Čelko, L. - Veselý, M. - Dzik, P.
Influence of substituted acetic acids on 'bridge' synthesis of highly photocatalytic active heterophase TiO2 in hydrogen production.
Journal of Sol-Gel Science and Technology. Roč. 105, č. 2 (2023), s. 471-488. ISSN 0928-0707. E-ISSN 1573-4846
Institucionální podpora: RVO:67985891
Klíčová slova: Sol-gel synthesis * Bridge mechanism * Heterophase anatase-brookite * Photocatalysis * Hydrogen production
Obor OECD: Physical chemistry
Impakt faktor: 2.5, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1007/s10971-022-06011-8

Anatase/brookite nanoparticles were prepared by low-temperature hydrolysis and polycondensation of titanium isopropoxide in the presence of low concentrations of acetic acid substituted in the alpha-position with Cl, F, NH2 or OH groups. A bridging mechanism described the formation of TiO2 with heterophase junctions between anatase and brookite. Substituted acetic acids formed short Ti---X-CH2-COO---Ti bridges that held neighboring Ti species close together and facilitated their condensation and the formation of Ti-O-Ti bonds. The structure of the anatase-brookite heterophase junctions was located and fully characterized by HR-TEM. The most acidic acetic acids substituted with groups with a strongly negative inductive effect, monochloroacetic, dichloroacetic, trichloroacetic, trifluoroacetic and amino acetic acids, supported the formation of TiO2, which in cooperation with the Pt cocatalyst had photocatalytic activity, 144.6-165.6 mu mol H-2/min. g, in the production of hydrogen. All photocatalysts had a pronounced mesoporous structure and a large specific surface area (212.6 to 247.2 m(2)/g), which contributed to the high photocatalytic activity.
Trvalý link: https://hdl.handle.net/11104/0342868