Fig. 1From: Carbonized metal–organic frameworks with trapped cobalt nanoparticles as biocompatible and efficient azo-dye adsorbentSEM images of CoOF (a) and carbonized CoOF before (b) and after (c) acid purification. X-ray diffraction spectra (d), TGA (e), and amount of released cobalt particles (f) from the carbonized and purified CoOFBack to article page