Abstract

Recycling lanthanoid components (REEs) utilized in advanced materials like Nd magnets is vital for the economical use of REE resources once the availability of many REEs is proscribed. During this work, the practicableness of victimization salmon milt for REE recovery and separation was examined, at the side of the identification of the binding website of REEs in salmon milt. Results showed that (i) salmon milt includes a sufficiently high affinity to sorb REEs and (ii) the sorption capability of the milt is one.04 mEq/g, that is comparable that of economic ion exchange organic compound. Heavier REEs have higher affinity for milt. A comparison of stability constants and sorption patterns of REEs mentioned within the literature suggests that the phosphate is accountable for the sorption of REE in milt [1]. The results were supported by metallic element (Dy) and atomic number 71 (Lu) LIII-edge extended x-ray absorption spectrum line (EXAFS) spectrographic analysis. The REE-P shell was known for the second neighbouring atom that shows the importance of the phosphate website as REE binding sites. The comparison of REE sorption pattern and EXAFS results between the milt system and alternative adsorbent systems (cellulose phosphate, Ln-resin, bacteria, and DNA-filter hybrid) disclosed that the coordination variety of phosphate is correlate with the slope of the REE pattern. The separation column loaded with milt was tested to separate REE for the sensible use of salmon milt for the recovery and separation of REE. However, water failed to flow through the column presumably due to the property of the milt. Thus, ordered adsorption–desorption approach employing a batch-type methodology was applied for the separation of REE. As associate example of the sensible applications of REE separation, Nd and Fe (III) were with success separated from an artificial answer of Nd magnet waste by a batch-type methodology victimization salmon milt [2-3].