Počet záznamů: 1

Enhanced fluorescence of selected cationic dyes adsorbed on reduced-charge montmorillonite

  1. 1.
    0370194 - UACH-T 2012 RIV GB eng J - Článek v odborném periodiku
    Pustková, P. - Klika, Z. - Preclíková, J. - Matys Grygar, Tomáš
    Enhanced fluorescence of selected cationic dyes adsorbed on reduced-charge montmorillonite.
    Clay Minerals. Roč. 46, č. 1 (2011), s. 93-103 ISSN 0009-8558
    Výzkumný záměr: CEZ:AV0Z40320502
    Klíčová slova: cationic dye * crystal violet * Nile blue * rhodamine B * reduced-charge montmorillonite * visible spectrophotometry * fluorescence
    Kód oboru RIV: DD - Geochemie
    Impakt faktor: 1.053, rok: 2011

    The aggregation of three cationic dyes (CD), crystal violet (CV), Nile blue (NB) and rhodamine B (RB) in aqueous solution was studied by visible absorption spectrophotometry and compared with methylene blue (MB). The distribution of the dye species (monomers, dimers, trimers, and tetramers) in aqueous solutions with different concentrations of dye was calculated using equilibrium stepwise aggregation constants K(n). These cationic dyes were intercalated into montmorillonite (SAz-1) and its reduced charge form (RC-SAz(210)) prepared by heating lithium montmorillonite (Li/SAz-1) at 210 degrees C. The fluorescence of fully saturated CD/SAz and low-CD loaded CD/RC-SAz(210) complexes was studied. Visible absorption spectra of CD aqueous solutions and visible absorption spectra and X-ray diffraction patterns (d(001)) of the CD/SAz and CD/RC-SAz(210) solid complexes were obtained and evaluated. Large fluorescence intensities were found for CV/RC-SAz(210) and NB/RC-SAz(210) complexes in the same way as for the complex of methylene blue with reduced-charge montmorillonite MB/RCM(210) described previously.
    Trvalý link: http://hdl.handle.net/11104/0204064