nopal - fairlife

Kapitel 5
148
Diese Studie befasst sich mit der Seperation (Filterwirkung)
von Nopal auf die Schwermetalle Cd (Cadmium) und Pb
(Blei) in wässrigen Lösungen.
Cd(II) and Pb(II) separation from aqueous solution using
clinoptilolite and Opuntia ectodermis.
C Barrera-Díaz, C Almaraz-Calderón, Ma T Olguín-Gutiérrez,
M Romero-Romo, M Palomar-Pardavé
This work presents the conditions for Pb(II) and Cd(II) removal
from aqueous solution using two different sorbent materials,
namely, clinoptilolite and Opuntia ectodermis, which were characterized
before and after entering into contact with the metalcontaining
aqueous media, using scanning electron microscopy
(SEM), thermal analysis (TGA) and surface area (BET). Metal
removal was found to depend on the initial metal concentration
in aqueous solution, pH and the mass/volume ratio. The Pb(II)
and Cd(II) uptake process was maximum at pH 4 for both
sorbents, which showed an adsorption capacity that was adequately
described by the Freundlich adsorption isotherm. The
Thomas model was used to describe the adsorption data from
column studies, the sorption capacity was 12.21 Pb(II) mg per
gram of Opuntia ectodermis, while 7.71 Pb(II) mg per gram of
clinoptilolite were adsorbed; lower values were obtained for
Cd(II) removal. It was demonstrated that the use of low cost
materials for the treatment of Pb(II), and Cd(II), containing
wastewater is an effective and economical alternative method.
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In seiner Ausgabe vom Juni 2004 berichtete das Journal der
AMA von einer Studie wonach mit Nopal-Extrakt die unangenehmen
Folgen übermässigen Alkohol-Konsums gelindert
werden können.