Extraction and Transport of Chromium(VI) Through a Bulk Liquid Membrane Containing Triphenylphosphine

Abstract

The solvent extraction of chromium(VI) in chloroform, dichloromethane, dichloroethane and its transport through a chloroformic bulk liquid membrane from sulphuric acid solutions with the neutral extractant triphenylphosphine (TPP) were studied. It was highlighted that the TPP extractant is an interesting complexing and efficient carrier for transport of chromium(VI) as [(HTPP)HCr2O7] complex from a 2M sulphuric acid solutions. It has a high ability to concentrate the chromium(VI) in the receiving phase according to the Donnan equilibrium. The co-extraction and the co-transport of sulphuric acid is very low and has no effect on the transport efficiency. The transport rate depends mainly on the initial concentration of the extractant.

Simple and selective extraction process for chromium (VI) in industrial wastewater

“…The separation of chromium (III) and chromium (VI) by a combination of solvent extraction and ion-exchange using zephyramine and TiO 2 has also been studied [17]. Liquid membrane containing triphenyl phosphine has been used for the extraction and transport of chromium [18]. A potentiometric Rhodamine-B based sensor has been studied [19] for the selective extraction of chromium based on the Rhodamine-B-chromate ion-association complex in a PVC membrane.…”