Removal of Cr3+ from waste solution by a bulk liquid membrane and Ion- Exchange membrane Nafion 117

Abstract

In this paper the removal efficiency of chromium trivalent ions by a bulk liquid membrane (BLM) and polymeric membrane has been investigated. Transport of Cr3+ ions has been performed using bulk liquid membrane containing D2EHPA (di-(2-ethylhexyl)phosphoric acid) as carrier and polymeric membrane (Nafion 117). The pH of feed solution was maintained at 2, while 1 M H2SO4 served as stripping phase in the received compartment of the permeation cell for BLM. The concentration of chromium in the feed and stripping phase vs the contact time were measured by AAS. The best removal efficiency (68 %) was observed for chromium ions when the membrane Nafion 117 was used. The recovery factor in BLM for chromium concentration 0.005M and 0.001 M was 20 %, respectively 24 %, that means the recovery factor depends on the feed solution concentration which influences the transport of chromium ions.