Читать книгу Application of Nanotechnology in Mining Processes - Группа авторов - Страница 24

Since the surfaces of the dendrimer nanoparticles have a high density of active sites, it will enhance the absorptivity of REEs in the acidic effluent, and at reactor 4, only these materials will be present. However, the REEs can be recovered from the dendrimer nanoparticles by slight acidification to initiate the protonation of these metal ions in the solution (Eq. 1.3). This property makes PAMAM dendrimers promising recyclable chelating agents for the metal ion separation [63]. The individual lanthanides can be extracted using an ion-exchange method where the ionic solution of the lanthanides is flush through a column containing resins and each ion is bonded to the resin with various strengths based on their ion size. After recovery of the lanthanides, the pH of the solution is then adjusted, and the formation of PAMAM-COOH@MNPs is achieved and can be reused.

(1.3)