Fig. 3From: Carbonized metal–organic frameworks with trapped cobalt nanoparticles as biocompatible and efficient azo-dye adsorbentSEM images of CoOF adsorbent (after purification) before adsorption (a) and after adsorption (b); the reusability of CoOF adsorbent (c); and XRD spectra of the CoOF before and after adsorption (d)Back to article page