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. 2022 Feb 9;8(6):eabm3132. doi: 10.1126/sciadv.abm3132

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Fig. 1. — (A) XRD patterns of CFA-F and CFA-C. Inset: Picture of CFA-C (left) and CFA-F (right). Scale bar, 4 cm. a.u., arbitrary units. (B) XPS full spectra of CFA-F and CFA-C. (C) Concentration of total REE in CFA-F and CFA-C by HNO₃ leaching (15 M, 85°C), HCl leaching (1 M, 85°C), and total quantification. (D) SEM image of CFA-F. Scale bar, 2 μm. (E) HCl-extractable REE contents (1 M, 85°C) and total quantification of REE in CFA-F and the recovery yield (Y₀) of REE. (F) SEM image of CFA-C. Scale bar, 5 μm. (G) HCl-extractable REE contents (1 M, 85°C) and total quantification of REE in CFA-C and the recovery yield (Y₀) of REE. All error bars in (C), (E), and (G) represent the SD, where N = 3.