Removal characteristics of anionic metals by micellar-enhanced ultrafiltration.
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.
Baek
Kitae
K
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea.
Kim
Bo-Kyong
BK
Cho
Hyun-Jeong
HJ
Yang
Ji-Won
JW
D002482:Cellulose; D002840:Chromates / Q000302:isolation & purification*; D005292:Ferricyanides / Q000302:isolation & purification*; D005374:Filtration; D008823:Micelles; D012989:Soil Pollutants / Q000302:isolation & purification*; D013501:Surface-Active Agents / Q000737:chemistry; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D002840:Chromates; D005292:Ferricyanides; D008823:Micelles; D012989:Soil Pollutants; D013501:Surface-Active Agents; D014873:Water Pollutants; D002482:Cellulose