Synthesis and Characterisation of PVC-based non-plasticised polymer inclusion membranes for selective metal extraction

Abstract

Polymer Inclusion Membranes (PIMs) are one of the most capable systems for metal separation from multi-metallic solutions. This process offers some advantages over other commercial purification techniques in terms of selectivity in the recovery of metal ions, simultaneous extraction and stripping, long-term stability, and is also eco-friendly. This study involves the synthesis, characterisation, and application of polyvinyl chloride-based Polymer Inclusion Membrane. The possible challenges associated with membrane fabrication have also been highlighted. 5-nonylsalicylaldoxime (ACORGA M5640) is used for the synthesis of PIMs. Synthesised membranes with different ratios of polyvinyl chloride to carrier were characterised by various techniques including scanning electron microscopy, atomic probe microscopy, and Fourier transform infrared spectroscopy, to understand the morphology/chemistry. Moreover, the thermal stability was also investigated by thermal gravimetric analysis (TGA). And finally, a contact angle measurement was done to check its hydrophobicity and wettability. Further, it was found that 98% of copper was recovered from the multi-metallic e-waste solution. Opportunities and future aspects of synthesised membranes have also been discussed. © 2023 Canadian Institute of Mining, Metallurgy and Petroleum.