It was observed that Cr (III) transport increased with the increase in HCl concentration because the transport was at a pH gradient, which was the main driving force. For the optimization of the various stripping agents, HCl concentration was employed, from 0.25 M to 1.75 M. Because the rate of Cr (III)-carrier complex formation at the interface of the feed solution and membrane increased up to 20 × 10 −4 mol/L, it was discovered that transport of Cr (III) rose with an increase in chromium content in the feeding phase. To maintain a constant pH (4) in the feed phase, a 0.2 M acetic acid–sodium acetate buffer was utilized. The Cr (III) solutions used in the feed phase had various ionic strengths and were adjusted with NaCl at concentrations ranging from 0.25 to 1.75 M. To obtain the best carrier concentration, D2EHPA concentrations between 0.04 and 0.6 M were used. This study used a supported liquid membrane system (SLM) using Celgard 2400 polypropylene as the support, di(2-ethylhexyl) phosphoric acid (D2EHPA) as the carrier, and kerosene as the diluent.
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