Chemistry of Cr(VI) Solvent Extraction Using Tri-n-octylamine
Authors:
- 1 February 1994
- journal article
- research article
- Published by Taylor & Francis in Separation Science and Technology
- Vol. 29 (4) , 535-542
Abstract
Experiments were carried out to clarify the mechanism for the extraction of Cr(VI) from sulfate-containing aqueous solutions using tri-n-octylamine (TOA). The results were consistent with a two-step reaction mechanism, initially involving complexation of TOA with bisulfate followed by substitution of bisulfate with bichromate in the complex. Experimental results support the contention that the first step only occurs with bisulfate and not with sulfate, explaining why the extraction decreases rapidly for initial pH values above 2. The equilibrium coefficient for the overall extraction reaction was determined to be 106.Keywords
This publication has 3 references indexed in Scilit:
- Development of a Spiral-Type Flowing Liquid Membrane Module with High Stability and Its Application to the Recovery of Chromium and ZincSeparation Science and Technology, 1989
- More on Mechanism and Some Important Properties of Chromate Ion ExchangeJournal of Environmental Engineering, 1988
- Wastewater treatment by liquid membrane processEnvironmental Science & Technology, 1977