Figure 1

The SEM images of (a) RPAL and the adsorbents (b) SiMg-21-2, (c) SiMg-21-4, (d) SiMg-21-8, (e) SiMg-21-12, and (f) SiMg-21-24.
The SEM images of (a) RPAL and the adsorbents (b) SiMg-21-2, (c) SiMg-21-4, (d) SiMg-21-8, (e) SiMg-21-12, and (f) SiMg-21-24.