Počet záznamů: 1  

2D-Titanium dioxide nanosheets modified with Nd, Ag and Au: Preparation, characterization and photocatalytic activity

  1. 1.
    SYSNO ASEP0466295
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    Název2D-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 autorů10
    Zdroj.dok.Catalysis Today. - : Elsevier - ISSN 0920-5861
    Roč. 281, MAR (2017), s. 165-180
    Poč.str.16 s.
    Jazyk dok.eng - angličtina
    Země vyd.NL - Nizozemsko
    Klíč. slovaModified titanium dioxide ; Photocatalysis ; Plasmonic effect ; EPR spectroscopy ; Lyophilization ; Spin trapping
    Vědní obor RIVCA - Anorganická chemie
    Obor OECDInorganic and nuclear chemistry
    CEPGA14-20744S GA ČR - Grantová agentura ČR
    7AMB14SK178 GA MŠk - Ministerstvo školství, mládeže a tělovýchovy
    Institucionální podporaUACH-T - RVO:61388980
    UT WOS000390515800019
    EID SCOPUS84995639322
    Anotace2D-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.
    PracovištěÚstav anorganické chemie
    KontaktJana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
    Rok sběru2017
Počet záznamů: 1