- Tytuł:
- Determination of the effective diffusivity of cadmium(II) in calcium alginate beads
- Autorzy:
-
Kwiatkowska-Marks, S.
Wójcik, M.
Kopiński, L. - Powiązania:
- https://bibliotekanauki.pl/articles/347047.pdf
- Data publikacji:
- 2011
- Wydawca:
- Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
- Tematy:
-
cadmium ions
alginate beads
effective diffusivity - Opis:
- Effective diffusivity (De) of cadmium compounds was calculated in the beads. The study was carried out using two methods: a shrinking core model (SCM) method and a newly developed method named conductometric. It turned out to be a simple and effective method for the calculation of effective diffusivity of Cd(II) in alginate sorbents. The De values obtained by the two methods depended on the alginate content in the beads. However, SCM, in contrast to the conductometric method, gave De values increasing with increasing alginate levels in the beads and lower than the molecular diffusivity of Cd(II), this being inconsistent with the mechanism of diffusion in porous carriers. Hence, the conductometric method can be considered as one giving more reliable results, compared with the SCM method. Moreover, diffusion retardation coefficients for the alginate beads were calculated. Enhanced content of the biopolymer in the beads caused retardation of Cd(II) diffusion in the beads due to the decreasing calculated retardation coefficients with the increasing alginate contents in the beads.
- Źródło:
-
Ars Separatoria Acta; 2011, 8; 11-23
1731-6340 - Pojawia się w:
- Ars Separatoria Acta
- Dostawca treści:
- Biblioteka Nauki
Artykuł