Effects of membrane content, feed phase, and stripping phase for palladium solution extraction by using a polymer inclusion membrane

Abstract

Palladium is now frequently utilized in fuel cells, electroplating, electronics, and catalysis. Due to their rarity and high cost, precious metal recovery has taken on a significant role. The extraction method frequently utilized in polymer inclusion membranes (PIMs) is both efficient and simple since it has been demonstrated that precious metal adsorption on the membrane significantly controls the mechanism of chemical adsorption. In this study, polyvinyl chloride (PVC) as a polymer, A336 as a plasticizer, and trioctylamine (TOA) as a carrier were used to produce a PIM by evaporation. After the production of PIMs, palladium extract was studied. The stripping phase, palladium concentration in the feed phase, and components of the membrane were changed to determine the optimum condition with better extraction ability. When 0.5 M of HCl was used, higher kinetic parameter results and higher than 85% extraction efficiency were achieved compared to other concen- trations. When the EDX results were examined, 3.3% palladium was retained on the membrane surface. When the palladium concentration was selected at 2.5 ppm, higher kinetic parameters were observed, and the extraction efficiency was over 90%. The best membrane was the PIM containing 40% PVC–40% A336–20% TOA. HIGHLIGHTS Palladium metal recovery is very important to reduce the depletion of natural resources.; PIMs are preferred because of their physical and chemical properties.; The polymer inclusion membrane is the most innovative extraction method.; PVC as a polymer can be used for the production of PIMs containing different ratios of plasticizers and carriers.;

Keywords

• base polymer
• evaporation
• extraction
• palladium
• polymer inclusion membrane