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Abstract
Surfactant-based separation of Fe(CN)(6)(3-) and CrO(4)(2-) using regenerated cellulose
membrane was studied in order to assess the potential of micellar-enhanced ultrafiltration
for the remediation of wastewater or groundwater polluted with ferriccyanide and chromate.
In the ferriccyanide/octadecylamine acetate (ODA) and chromate/ODA systems, removal
of ferriccyanide increased from 73 to 92% and to 98%, and that of chromate from 64
to 97% and to >99.9% as the molar ratio of ODA to ferriccyanide and to chromate increased
from 1 to 2 and to 3, respectively. In the ferriccyanide/chromate/ODA system, while
the removal of ferriccyanide increased from 62 to 72% and to 93%, the removal of chromate
from 20 to 38% and to 68% as the molar ratio of ferriccyanide:chromate:ODA increased
from 1:1:1 to 1:1:2 and to 1:1:4, respectively. With the molar ratio of 1:1:6, the
removal was >99.9 and 98% for chromate and ferriccyanide, respectively. Ferriccyanide
ions were more easily bound to ODA micelles because the binding power of ferriccyanide
was greater than that of chromate.