Record details

    Removal of AsV, CrVI, and VV from solutions by calcined hydrotalcite and regeneration of used sorbent
Statement of responsibility
    F. Kovanda, E. Kovácsová, David Koloušek
Other titles
    15th Conference on Clay Mineralogy and Petrology, Brno, September 6-10, 1998 - Proceedings (Variant.)
    Koloušek, David
    Kovácsová, E.
    Kovanda, F.
Source title - serial
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis. Geology
    Vol. 28-29
    p. 155-164
    4 obr., 2 tab.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Subject group
    iontová výměna
    mineralogie experimentální
Abstract (in english)
   The removal of arsenate, chromate, and vanadate from water solutions by hydrotalcite calcined at 350-550 °C was studied. The initial anion concentration was 0.002 mol 1-1. The sorption isotherms were measured at 20 °C and neutral pH solutions. The Langmuir adsorption isotherm was used for the sorption capacity evaluation. he ability of calcined hydrotalcite for the anion removal from solution decreased in order vanadate-arsenate-chromate. The sorbed anions were released by anion exchanged in a carbonate containing solution and the hydrotalcite after next cation-anion exchange gradually reduced the absorption capacity of calcited hydrotalcite. The sorption capacity decreased by 50% after the first two cycles but it did not change significantly in the further cycles. When chromate anions were absorbed, the decrease of sorption capacity was not observed during repeated calcination-rehydration-anion exchange cycles.
   The change of the sorption capacity was influenced by the ability of calcined hydrotalcite to regenerate the layered crystal structure during the rehydration process
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    6. 3. 2008
Import date
    8. 8. 2012