in concentration of hydrogen peroxide, first, the solution should be quite pure, and then, it concentrate with methods such as vacuum distillation and cooling crystallization, because impurities in the hydrogen peroxide solution in high concentrations are causing decomposition of this substance; that is very dangerous. the purpose of this article is separation of chromium and magnesium cations ...

An intensive study has been made to see the performance of the different liner materials with bentonite on the removal efficiency of Cu(II) and Zn(II) from industrial leachate. An artificial neural network (ANN) was used to display the significant levels of the analyzed liner materials on the removal efficiency. The statistical analysis proves that the effect of natural zeolite was significant ...

Some new compounds based on bis-benzimidazole moieties have been synthesized and characterized by IR and NMR spectroscopies. The ability of 3a in transition metal cation sensing such as Co2+, Ni2+, Zn2+, Mn2+, Fe2+ and Cu2+ have been investigated by Uv-vis and fluorescence spectroscopy in methanol solvent. The complexation constants and complex stoichiometry of Cu2+ have been determined. The ex...

The development of efficient and low-cost electrocatalysts toward the oxygen evolution reaction (OER) is critical for improving efficiency several electrochemical energy conversion storage devices. Here, we report an elaborate design synthesis porous Co-based trimetallic spinel oxide nanoboxes (NiCo2−xFexO4 NBs) by a novel metal-organic framework engaged strategy, which involves chemical etchin...

Alkali and alkaline earth metals hydrogen sulfate catalyzed the one-pot three component condensation reactions of aldehydes, 1,3-dicarbonyl compounds and urea or thiourea under solvent-free conditions leading to 3,4-dihydropyrimidin-2(1H)-ones in high yields at 80 °C. Our results showed that Biginelli reaction not only is pH dependent, but the cation of catalyst plays an importan...

The purpose of this study is to improve the thermo-stabilty of alkaline protease produced by Bacillus sp. using rice bran during solid state fermentation. After partial purification of alkaline protease, various parameters namely effect of temperature and metal ions on enzyme activity was investigated. The suitable temperature for alkaline protease activity was observed at 50°C. Among various m...

Nickel-based oxides are highly active, cost-effective materials for the oxygen evolution reaction in alkaline conditions. Recent experimental studies have revealed importance of surface deprotonation and alkali metal cation adsorption on activity Ni oxide surfaces, contact with aqueous electrolyte. As a first step to elucidate role activity, we performed first-principles electronic structure ca...

We observed the bare W2(+) metal cation upon electron ionization of the weakly bound W(CO)6 dimer. This metal cation can be only observed due to the fast conversion of the weak cluster bond into a strong covalent bond between the metal moieties.