Počet záznamů: 1
2D-Titanium dioxide nanosheets modified with Nd, Ag and Au: Preparation, characterization and photocatalytic activity
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SYSNO ASEP 0466295 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název 2D-Titanium dioxide nanosheets modified with Nd, Ag and Au: Preparation, characterization and photocatalytic activity Tvůrce(i) Pližingrová, Eva (UACH-T) SAI, ORCID
Klementová, Mariana (UACH-T) RID, SAI, ORCID
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Boháček, Jaroslav (UACH-T) SAI
Barbieriková, Z. (SK)
Dvoranová, D. (SK)
Mazúr, M. (SK)
Krýsa, J. (CZ)
Šubrt, Jan (UACH-T) SAI, RID
Brezová, V. (SK)Celkový počet autorů 10 Zdroj.dok. Catalysis Today. - : Elsevier - ISSN 0920-5861
Roč. 281, MAR (2017), s. 165-180Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Modified titanium dioxide ; Photocatalysis ; Plasmonic effect ; EPR spectroscopy ; Lyophilization ; Spin trapping Vědní obor RIV CA - Anorganická chemie Obor OECD Inorganic and nuclear chemistry CEP GA14-20744S GA ČR - Grantová agentura ČR 7AMB14SK178 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UACH-T - RVO:61388980 UT WOS 000390515800019 EID SCOPUS 84995639322 DOI 10.1016/j.cattod.2016.08.013 Anotace 2D-Titanium dioxide nanosheets modified by the addition of Nd, Au and Ag dopant in the first reaction step were synthesized from the lyophilized aqueous colloids of peroxo titanic acid by high-temperature treatment. The concentration of the dopant in the sample was 1 at.% towards Ti. The results of their detailed morphological and phase characterization (SEM, TEM with EDX, XRD) evidenced that annealing temperatures 500, 650 and 800 °C caused the formation of 2D-foils composed of packed anatase nanocrystals; samples annealed at 950 °C represent anatase/rutile mixture. While neodymium dopant is built into the structure of anatase causing the changes in the parameters of anatase crystal lattice, such alterations were not found for Au- and Ag-modified samples, with gold or silver nanoparticles dispersed on surface detected by TEM/ED/EDX. Q-band EPR spectra of modified 2D-TiO2 annealed at 800 °C measured at room temperature or 100 K revealed the presence of paramagnetic signals corresponding to Ti(III) centers inside the anatase lattice, along with signals associated with medium-polarized conduction electrons, already before exposure. The photoinduced generation of paramagnetic species (e.g., Ti(III), O−, O2radical dot−) upon UVA exposure of modified 2D-TiO2 was confirmed by X-band EPR spectroscopy. Moreover, EPR spectra evidenced that Au- or Ag-modified samples annealed at 500 °C contained nitrogen paramagnetic species (View the MathML source and NO) coming from the aqueous ammonia used in synthesis, which are responsible for the visible-light activity of these samples. The tests of photocatalytic activity of modified 2D-TiO2 dispersed in water or dimethylsulfoxide performed using EPR spin trapping technique or via the decomposition of 4-chlorophenol showed a decline in UVA photoactivity for all modified titania samples in comparison to the unmodified 2D-TiO2; visible-light activity of modified 2D-TiO2 nanosheets annealed at 800 °C was almost negligible. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2017
Počet záznamů: 1