A 3D polyoxoniobate-based framework showing performance in dye removal from aqueous solution

Document Type : Article

Authors

1 School of Chemistry, College of Science, University of Tehran, Tehran, P.O. Box 14155-6455, Iran.

2 School of Chemical Engineering, University of Tehran, Tehran, P.O. Box 1417466191, Iran

Abstract

A polyoxoniobate-based 3D framework [K8H30Nb6O31] (1), was prepared through hydrothermal method and characterized by single crystal X-ray diffraction, powder X-ray diffraction (PXRD), solid state UV-visible and thermogravimetric analysis (TGA). Structure and properties of 1 were investigated with various computational methods. QTAIM and NBO studies together with thermogravimetric analysis suggest strong interactions between potassium ion, Lindqvist hexaniobate and water molecules. Hirshfeld surfaces around the Nb6O198- reveal that the Lindqvist ion acts as a ɳ3 ligand for the alkali cations. One remarkable detail about the structure is the presence of an encaged potassium ion, surrounded by six water molecules and four potassium ions. The prepared polyoxoniobate (PONb) was tested in the removal of diazo dye pollutant in water. The result shows that 1 has good activity and stability during the dye removal process and can be recovered and reused at least for five cycles.

Keywords


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