Synthesis and application of iron based metal organic framework for efficient adsorption of azo dyes from textile industry samples

In this work, we have synthesized an iron based metal organic framework for removal of azo-dyes from textile industry wastewaters. The metal organic framework is comprised of two ligands, terephthalic acid and iminodiacetic acid chelated with iron. The chemical composition, surface morphology and diffraction pattern of the synthesized binary metal organic framework was confirmed with FT-IR, FE-SEM and XRD. Interaction with the model azo dye (methyl orange) has resulted in re-structuring of the native metal organic framework original shape (hexagonal nanorods to smaller octahedron structures). Under optimized conditions (time, and pH), the metal organic framework has a maximum methyl orange adsorption capacity of ∼ 280 mg per g. In presence of major salts as co-existing ions and two non-azo dyes, the methyl orange removal ability of metal organic framework significantly remained intact. The metal organic framework has displayed its practical applicability by efficiently removing two azo dyes (yellow and pink) from local textile industry wastewaters.