Selective Permeation of Vanadium(V) and Chromium(VI) through Anion Exchange and Supported Liquid Membranes
✍ Scribed by Kojima, T. ;Yagi, S. ;Nishijima, K. ;Matsukata, M.
- Publisher
- Curtin University of Technology
- Year
- 2008
- Tongue
- English
- Weight
- 420 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0969-1855
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✦ Synopsis
Selective permeation of vanadium(V) and chromiwn(V1) using three types of membrane systems war studied. The first was an mion exchange membrane, the second and third were supported liquid membranes containing either a terhhry mine or a qualernury ammonium salt. The membrane was sandwiched between two glass cells. One cell was filled with a solution of identical concentrations of vanadium(V) and chromium(VI), and the other cell contained sodium hydroxide solution. The permeation rates of vamalum(V) and chromium(Vi) were measured from the concentration c h g e in the solution on the recovery side of the membrane. The selectivity of vanadium(V) over chromium(VI) was defined as the ratio of their rates. The selectivity of vmadium(V) overchromium(VI) was as high as 10 for pH of feed phase between 8 and I0 when wing the quaternary ammonium salt and much better than these for the other membranes with an alkaline feed phase, which was used to simulate of the efluent from kaching of the heavy oil combustwn ash and other wmtes containing vmdium.