How does the initial concentration of hydroxylamine (HA) in the feed phase affect the separation efficiency and purity in the PIM-ED process?

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Topic
The study investigates the effect of the initial concentration of hydroxylamine (HA) in the feed phase on the separation efficiency and purity of HA using the PIM-ED process. This is important for optimizing the process to achieve high-purity HA.
Answer
The initial concentration of hydroxylamine (HA) in the feed phase significantly affects the separation efficiency and purity in the PIM-ED process. As the initial concentration of HA increased from 0.05 mol·L−1 to 0.25 mol·L−1, the flux and purity of HA increased due to enhanced contact opportunities between HA and the carriers, promoting the formation of ion-carrier complexes. However, when the concentration further increased to 0.51 mol·L−1, the purity of HA decreased from 99.4% to 79.8%. This reduction is attributed to the presence of metal ions from the carbon electrode, which accelerated the decomposition of HA at higher concentrations. Therefore, controlling the initial concentration of HA is crucial for achieving high-purity HA in the PIM-ED process.
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