No abstract

Lys-Zn, Lys-Co, Lys-Cu and Lys-Ni complexes prepared by reaction of metal acetates with lysine (Lys). Complexes were characterized by elemental analysis (C, H, N and M), (UV/Vis) electronic spectra, FT-IR, 1H-13C NMR, (ESR) spectroscopy, Thermal analyses (TGA) and magnetic moments measurements. Physical studies were applied on the synthesis complexes such as solubility, density, molar volume, refractive index and excess refractive index and electronic (UV/Vis) spectra measurements. Nickel oxide nanoparticles synthesized from calcinations of complex at 800 o C. Nanoparticles were characterized by (XRD) and (TEM). Molecular size is at range 43-52 nm. Nanoparticles were used to remove dyes from aqueous solution such as methylene blue (MB) and the percent of removal is 96 %. The best model which represents the adsorption of MB is Langmuir isotherm. The best model for adsorption kinetic of MB ispseudo-second-order model with determination coefficient (R 2 ) close to the unity.

The metal precursor derived from the reaction of Co(II) acetate with the mixed ligands of lysine(Lys) and glutamine(Glu) was used to synthesize Co 3 O 4 nanoparticles. The precursor was characterized by (C, H, N, M), IR, electronic spectra, TGA and effective magnetic moments. Co 3 O 4 nanoparticles were prepared from calcinations of the synthesized precursor at 800 o C. The obtained nanoparticles were characterized by X-ray powder diffraction and transmittance electron microscope. The average particle size is 50 nm. Co 3 O 4 nanoparticles. Adsorption of Methylene Blue on the surface of the Co 3 O 4 was studied. The synthesized metal oxide has 27.2 (mg/g) adsorption capacity of methylene blue (MB) from aqueous solution and removed 95 % of it. This method can be used to remove dyes from wastewater. Langmuir isotherm was the best model represents the adsorption of MB. Pseudo-second-order model with determination coefficient (R 2) close to the unity was the best model for adsorption kinetic of MB.