Producing High Purity Nickel Metal Powder from Nickel Wastes through Acidic Leaching by Sulfuric Acid

Nickel has found increasing application in electronic, automobilemanufacturing, plating, and metal industries and so on. Producing highquality metal powders to satisfy increasing demand for advanced materialsis of very high importance. There are a few numbers of standard powderproduction techniques. An acidic leaching has been applied in presentresearch. Sulfuric acid has been used to leach nickel wastes of platingindustry. To produce nickel oxide powder furnaces with no protectingatmosphere and to produce pure nickel powder, tube furnace with hydrogenatmosphere has been applied. Variables performed in the research aretime, density of sulfuric acid, and amount of hydrogen peroxide. Toanalyze powders produced, EDS element analysis and to determine size ofpowder particles, SEM has been applied. It was shown by the results thatthe highest amount of nickel dissolution in sulfuric acid (98%) has takenplace during one hour and there is a direct relationship between hydrogenperoxide amount and nickel dissolution in sulfuric acid

Theoretical and experimental investigations into the structural, electronic, and molecular properties of 1,5-dihydropyrano2,3-cchromene derivatives

In this study, a simple and efficient method for the synthesis of 1,5-dihydropyrano2,3-cchromene derivatives is reported by three component reaction of aromatic aldehydes, malononitrile, and 3-hydroxycoumarin in the presence of piperidine as base in ethanol, under reflux conditions. Also, the experimental results involving new and already synthesized compounds are compared with the theoretical calculations. The energy, molecular electrostatic potential (MEP), HOMO�LUMO energy gap, chemical properties and NMR analyses of 1,5-dihydropyrano2,3-cchromene derivatives in DMSO solution were estimated using density functional theory and 6-311++G (d,p) basis set. The solvent effect was explored using the polarizable continuum model (PCM) method. Increasing polarity and having no much difference in energies show the more effects of newly synthesized compounds (R2-DHPC) towards already synthesized compounds (R4-DHPC) in human body. Also, the results display that there is a good agreement between experimental and theoretical data. © 2020 by the authors

Sio2-pocl2 nano-particles promoted the synthesis of novel structure of alkyl 2-oxo-3,4-diaryloxazolidine-5-carboxylate derivatives

Silica-POCl2 was used as the promoter for the three-component reaction of ethyl/methyl 3-phenyl glycidate, aniline derivatives, and dimethyl carbonate, leads to the synthesis of methyl/ethyl 2-oxo-4-phenyl-3-aryloxazolidine-5-carboxylate derivatives. The desired product was obtained in high yields. © 2021 Bentham Science Publishers