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The sonochemical synthesis of Dy2BaNiO5 nanocomposites is reported, for the first time. The metal nitrates and core almond are used as precursors and capping agent, respectively. Effect of sonication power is investigated in this work.

In this paper, green and facile synthesis of sulfur-and nitrogen-codoped carbon nanospheres (CNs) was prepared from the extract of Hibiscus sabdariffa L by a direct hydrothermal method. Finally, sulfur-carbon nanospheres (CNs) were used as the adsorbent to remove Pb +2 ions from aqueous solutions because of the high surface area of S-CNs from CNs and N-CNs. e synthesized nanospheres were examined by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy, transmission electron microscopy (TEM), and nitrogen adsorption-desorption isotherms. e results show spherical shapes have a particle size of up to 65 nm with a high surface area capable of absorbing lead ions efficiently. Additionally, the factors affecting the process of adsorption that include equilibrium time, temperature, pH solution, ionic intensity, and adsorbent dose were studied. e equilibrium removal efficiency was studied employing Langmuir, Freundlich, and Temkin isotherm forms. e kinetic data were analyzed with two different kinetic models, and both apply to the adsorption process depending on the values of correlation coefficients. e thermodynamic parameters including Gibbs free energy (ΔG°), standard enthalpy change (ΔH°), and standard entropy change (ΔS°) were calculated for the adsorption process.

The Pt / rGO nanocatalyst was synthesized by the immobilization method by deposition of platinum nanoparticles on reduced graphene oxide (rGO) as a support material. The support (rGO) was prepared from the reduction of graphene oxide (GO) by the reducing agent sodium borohydride (NaBH4), while (GO) was prepared from the graphite oxidation using the modified Hummer method. Morphological, chemical and structural characteristics of synthesized samples were investigated by Scanning Electron Microscope (SEM), transmittance Scanning Microscope (TEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and X-ray and Raman Spectroscopy. The performance of the Pt/rGO catalysts were evaluated in the benzyl alcohol oxidation to produce benzaldehyde using an environmentally friendly oxidizing agent, hydrogen peroxide, under moderate conditions. The variables that were studied on oxidation of benzyl alcohol were temperature, catalyst mass and H2O2 concentration. The best results were achieved when the catalyst amount was 10 mg, 50% hydrogen peroxide concentration and 80 °C reaction temperature. The conditions under which the reaction was carried out are moderate reaction conditions, and the oxidizing agent (H2O2) is an environmentally friendly oxidizing agent.

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This study includes the photocatalytic degradation of Rhodamine B (Rh.B) employing a heterogeneous photocatalytic process by using ZnO nanoparticles that was prepared by green sol-gel process. The structural, morphological, and its optical properties of ZnO Photocatalyst was studied using different characterization techniques such as Xray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), The influencing factors studied were the amount of the catalyst, the concentration of dye and pH on photocatalytic degradation of Rhodamine B. The experiments were carried out by irradiating the aqueous solutions of dyes containing photocatalysts with Sunlight. The rate of decolorization was estimated from residual concentration spectrophotometrically. Similar experiments were carried out by varying pH (3-11), amount of catalyst (0.25-2.0 g/L) and initial concentration of dye (5-50 mg/L). The experimental results indicated that the maximum degradation (71%) of dyes was achieved using ZnO photocatalyst at pH 10 after 240 min.

In this work, new double perovskite Tb2ZnMnO6 nanoparticles were successfully synthesized by a sol–gel auto combustion method.