In this paper, cubic nickel oxide nanoparticles were successfully prepared by solid-state thermal decomposition of nickel(II) macrocyclic Schiff-base complex at 450°C for 3 h without employing toxic solvent or surfactant and complicated equipment. nickel(II) macrocyclic Schiff-base complex was synthesized by the reaction of 1,2-bis(2-formyl-3-methoxyphenyl)propane, NiCl2•6H2O and 1,3-phenylenediamine in methanol at room temperature and characterized by elemental analyses and FT-IR spectroscopy. The as prepared NiO nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD pattern result shows that the synthesized NiO nanoparticles are pure and single phase. The SEM and TEM results show the morphology of the as prepared NiO nanoparticles is almost cubic shape with the average size between 20-150 nm. On the basis of the above results, other transition metal macrocyclic Schiff base complexes are therefore potentially capable of forming metal oxide nanoparticles. تفاصيل المقالة

In this paper, nanoparticles of copper oxide (CuO) were synthesized using solid-state thermal decomposition of new copper precursor at 600 ºC for 3 h. The copper precursor was prepared from the mixture of CuCl2.6H2O and benzoic acid in H2O at the presence of KOH. Nanoparticles of copper oxide were characterized by Fourier transform infer-red (FT-IR), UV-Vis and photoluminescence (PL) spectroscopy X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). All results confirmed the preparation of pure phase of CuO nanoparticles. In addition, adsorption of methyl green in aqueous solution on copper oxide nanoparticles as adsorbent was studied at various parameters such as adsorbent dosage and agitation time. It was found that methyl green dye removal increased by adsorbent dosage (0-30 mg) and contact time (0-120 min) This research revealed that the copper oxide nanoparticles could be used as a suitable adsorbent for removal of various organics dyes from aqueous solutions. تفاصيل المقالة

In this work, Ni/NiO nanocomposites have been prepared using simple, environment friendly and low-cost solid-state thermal decomposition method from mixture of nickel acetate tetrahydrate as a Ni precursor, 2-aminophenol and 4-dimethylaminobenzaldehyde at the molar ratio 1:2:2 at 400 and 500C for 3 hours. The Ni/NiO nanocomposites were characterized with Fourier transformed infra-red spectroscopy (FT-IR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-Ray fluorescence (XRF). The XRD and XRF results confirmed that the nanocomposite products contain a mixture of nickel and nickel oxide. The Ni or NiO content vary with the temperature used for the synthesis. Upon increasing the temperature from 400 to 500C, the amount of NiO was found to be increase, due to a complete oxidation of Ni to NiO. The TEM images confiemed that the composites were spherical in shape with a distribution size of about 10-30 nm. In addition, the products display reasonable electrochemical performance. تفاصيل المقالة

Transition metal ions have been extensively studied for the removal of heavy metal ions as efficient adsorbent from aqueous solution. In this work, Fe2O3 nanoparticles were synthesized by thermal decomposition route of FeSO4.4H2O at the presence of urea (1:1 molar ratio) at two different temperatures (500 °C and 600 °C) and characterized by XRD and TEM. The XRD result show that single-phase of α-Fe2O3 was prepared by increasing of calcination temperature from 500 °C to 600 °C. TEM images confirmed that the as-prepared products have a different shapes and that particle sizes are in the range of tens nanometers. The average crystallite size of pure α-Fe2O3 calculated from XRD pattern was 53.1 nm and 41 nm, respectively, depending on the method employed. In addition, Pb(II) adsorption has been studied and considered as a function of pH solution, contact time, initial Pb(II) concentration and also adsorbent dosage. The adsorption results show that the iron oxides were able to high percentage remove Pb(II) by increasing of contact time, adsorbent dosage and initial Pb(II) ion. The pH solution of 6 proved to be the most suitable for the removal of Pb(II). تفاصيل المقالة

In this study, Ni/NiO nanocomposites were prepared using simple, environment-friendly and low-cost solid-state thermal decomposition method from nickel (II) Schiff base complex at 400 and 500°C for 3 hours. The Ni/NiO nanocomposites were characterized with Fourier transformed infra-red spectroscopy (FT-IR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-Ray fluorescence (XRF). Results of XRD and XRF confirmed that the nanocomposite products contain a mixture of nickel and nickel oxide. The Ni or NiO content varied with the temperature used for the synthesis. Upon increasing the temperature from 400 to 500°C, the amount of NiO was found to be increased due to a complete oxidation of Ni to NiO. The TEM images demonstrated that the composites were spherical with a distribution size of about 10-30 nm. In addition, the products displayed reasonable electrochemical performance. تفاصيل المقالة

In this paper, nanoparticles of copper oxide (CuO) were synthesized using solid-statethermal decomposition of the new copper precursor at 600 ºC for 3 h. Thecopper precursor was prepared from the mixture of CuCl2.6H2O and benzoic acidin H2O in the presence of KOH. Nanoparticles of copper oxide were characterizedby Fourier transform infer-red (FT-IR), UV-Vis, and photoluminescence (PL)spectroscopy X-ray powder diffraction (XRD) and transmission electronmicroscopy (TEM). All results confirmed the preparation of the pure phase of CuOnanoparticles. In addition, the adsorption of methyl green in an aqueous solution ofcopper oxide nanoparticles as adsorbent was studied at various parameters suchas adsorbent dosage and agitation time. It was found that methyl green dyeremoval increased by adsorbent dosage (0-30 mg) and contact time (0-120 min).This research revealed that the copper oxide nanoparticles could be used as asuitable adsorbent for the removal of various organic dyes from aqueous solutions. تفاصيل المقالة