Fig. 2
From: Adsorption of dibenzothiophene sulfone using Fe3+ and Fe6+-impregnated clay adsorbents
SEM micrographs of (a) raw bentonite, (b) bentonite-Fe3+, (c) bentonite- Fe6+, (d) raw activated clay, (e) activated clay-Fe3+, and (f) activated clay-Fe6+