Počet záznamů: 1  

Nanocellulose-Templated Porous Titania Scaffolds Incorporating Presynthesized Titania Nanocrystals

  1. 1.
    0452678 - UFCH-W 2016 RIV US eng J - Článek v odborném periodiku
    Ivanova, A. - Fravventura, M. C. - Fattakhova-Rohlfing, D. - Rathouský, Jiří - Movsesyan, L. - Ganter, P. - Savenije, T. J. - Bein, T.
    Nanocellulose-Templated Porous Titania Scaffolds Incorporating Presynthesized Titania Nanocrystals.
    Chemistry of Materials. Roč. 27, č. 18 (2015), s. 6205-6212. ISSN 0897-4756
    Institucionální podpora: RVO:61388955
    Klíčová slova: RESOLVED MICROWAVE CONDUCTIVITY * SENSITIZED SOLAR-CELLS * THIN-FILMS
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 9.407, rok: 2015

    Nanocrystalline cellulose (NCC) is an abundant biogenic nanomaterial with unique properties that enables the efficient synthesis of mesoporous crystalline titania. We significantly enhance the photocatalytic activity of titania thin films by introducing solvothermally synthesized preformed anatase nanoparticles into a sol-gel based biotemplated titania scaffold. The resulting dual source titania thin films containing different amounts of preformed crystalline species were investigated by time-resolved microwave conductivity (TRMC) measurements and tested in the photocatalytic conversion of 4-chlorophenol. The gradual addition of preformed nanopartides leads to a consistent increase of the mean size of titania crystalline domains, whereas the porosity of the composite is well-preserved due to the shapepersistent nature of the NCC template. Microwave conductivity studies establish increased photoconductivity of the films containing preformed anatase nanoparticles in comparison to that of films made without the nanoparticles. The synergistic features of the dual source titania, namely the improved crystalline properties brought by the preformed nanocrystals in combination with the high surface area provided by the NCC-templated sol-gel titania, result in a very high photocatalytic activity of the films in the photocatalytic decomposition of 4-chlorophenol. In quantitative terms, the dual source titania films prepared with 75% nanoparticles exhibit a first order degradation rate constant of 0.53 h(-1) (1.47 x 10(-4) sec(-1)), which strongly outperforms the activity of commercial P90 nanopowder showing a rate constant of 0.17 h(-1) (0.47 x 10(-4) sec(-1)) under the same conditions.
    Trvalý link: http://hdl.handle.net/11104/0253604