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Synthesis of crystalline NiO nanorodes from a new Ni(II) nano-coordination compound and its application in sonocatalytic dye removal

Nanostructures of a new nickel(II) coordination compound of [Ni(ntaH2)2].2H2O, 1, (where ntaH3 is nitrilotriacetic acid) were synthesized, and characterized by scanning electron microscopy (SEM), x-ray powder diffraction (XRPD), and FT-IR spectroscopy. Moreover, the structure of compound 1 was determined using the single crystal x-ray diffraction technique. The asymmetric unit of 1 consists of one half of the [Ni(ntaH2)2] complex where the Ni ion is located on the center of symmetry, and one non-coordinated water molecule. The ntaH2 ligand coordinated to the metal center in a tridentate fashion provides a slightly distorted octahedral geometry around the nickel(II) ion. Non-covalent interactions i.e. hydrogen bonding extend the molecular structure into a 3D supramolecular array. Compound 1 was found to be a cost-effective precursor for nanoscale nickel oxide which was obtained in good yield. NiO nanorods were fully characterized and examined as a sonocatalyst to remove the methyl orange (MO) from the aqueous solution in the absence of any oxidants. Knowing that increasing metal concentrations endangers the aquatic ecosystems, the above treatment of the Ni(II) ion might be considered as an effective decontamination of nickel-bearing wastewaters and a facile route to converting it to a desirable NiO product.