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Closed Access item Chromium(VI) removal through facilitated transport using Cyanex 923 as carrier and reducing stripping with hydrazine sulphate

Authors:Alguacil, Francisco José
Alonso Gámez, Manuel
Issue Date:2003
Publisher:American Chemical Society
Citation:Environmental Science and Technology 37(5):1043-7 (2003)
Abstract:The transport of chromium(VI) through a flat-sheet supported liquid membrane (FSSLM) containing CYANEX 923 (mixture of phosphine oxides) as a carrier has been studied. The permeation of the metal is investigated as a function of various experimental variables: hydrodynamic conditions, concentration of chromium(VI) and HCI in the feed phase, CYANEX 923 concentration and diluent in the membrane, and strippant concentration in the receiving phase. By using hydrazine sulfate in the receiving phase, chromium(VI) is immediately reduced to the less toxic chromium(III). The aqueous mass transfer coefficient and the thickness of the aqueous boundary layer were calculated from the experimental results. The selectivity of CYANEX 923-based FSSLM toward different metal ions and the behavior of the system against other carriers is presented.
Publisher version (URL):http://dx.doi.org/10.1021/es020585s
URI:http://hdl.handle.net/10261/43826
ISSN:1520-5851
Appears in Collections:(CENIM) Artículos

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