Fig. 2From: Environmentally benign Fe(III)–montmorillonite for rapid adsorption of methylene blue dye in aqueous medium under ambient conditions a Powder XRD patterns of Fe(III)–Mt in comparison with Ca(II)–, Na(I)–, Fe(III)– and spent Fe(III)–Mt at relative humidity 40%. b FT-IR spectra of freshly prepared Fe(III)–Mt compared with Na(I)–Mt as well as spent Fe(III)–MtBack to article page