What is the role of electrodialysis (ED) in the PIM-ED process for separating hydroxylamine (HA) from metal ions?

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Topic
The study combines polymer inclusion membrane (PIM) technology with electrodialysis (ED) to separate hydroxylamine (HA) from metal ions. The ED process is used to provide a continuous proton gradient necessary for the PIM process.
Answer
Electrodialysis (ED) plays a crucial role in the PIM-ED process by efficiently and continuously providing the proton gradient required for the transport of hydroxylamine (HA) without introducing other ions. The ED process uses an external electric field to generate protons and hydroxide ions, which are transported to the stripping phase and feed phase, respectively. This maintains the proton gradient between the two phases, enhancing the driving force for HA transport. The study found that the ED process significantly increased the permeability coefficient of HA, with optimal results achieved at a current density of 10 mA·cm−2. The ED process thus enables the selective separation of HA from metal ions and inorganic acid ions, achieving high-purity HA production.
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