The Na 2 SO 4 samples were obtained by slow evaporation method. mechanisms of the formation electron and hole trapping centers are investigated spectroscopic methods. Intrinsic recombination emission 2.9–3.1 eV impurity 1.85 excited at 4.0–4.5 eV. 3− −SO − Mn + revealed. local levels corresponding between center decay intrinsic was recorded temperatures 130–150 K 280–350 K.

Chiral properties were investigated in Cu and Cu2O composite films prepared by magneto-electrodeposition. The Cu-Cu2O films were electrodeposited in a CuSO4 and Na2SO4 aqueous solution under magnetic fields B (2 and 5 T) parallel (+B) or antiparallel (–B) to the faradaic current. The magneto-electrodeposited films were used as modified electrodes, and the chiral voltammetric behaviors were obse...

Sulphates usually affect calcium aluminates in cements. Sulphate ions might have negative effects on cement hydration and it would be a reason of decrease in cement strength. In this study, the effects of Na2SO4 solution on the concretes made from OPC with oil shale ash (OSA) addition (0, 15 and 30%) were investigated. Concretes with 15% OSA gave the lowest value of Length Change Factor (LCF). ...

A potential industrial waste-waste co-treatment process was proposed and verified for the recovery of valuable metals Co, Ni, Cu from copper smelting slag by utilizing high temperature SO2 off-gas. Sulfation roasting followed water leaching under designed thermodynamic conditions conducted to facilitate selective formation sulfates while separating iron as oxide. Several parameters were studied...

The simultaneous removal of SO2/NO2 by limestone slurry was studied in a gas-liquid bubbling reactor. Experiments were carried out to find the effect of various operating parameters such as inlet concentration of SO2 and NO2, reaction temperature, O2 content in the flue gas and additive on the SO2 and NO2 removal efficiencies. SO2 removal efficiency decreased with inlet NO2 concentration, react...

A new approach to study the thermodynamics of salt-protein interaction is described using a protein-ligand binding system. The effects of salts on the thermodynamics of association or dissociation of the ligand are related to the effect on the hydrophobic side chains on the interior of the protein by these salts. The calculated free energies of transfer of a methylene group from an interior of ...

An exfoliated graphite-polystyrene composite electrode was evaluated as an alternative electrode in the oxidation and the determination of oxalic acid in 0.1 M Na2SO4 supporting electrolyte. Using CV, LSV, CA procedures, linear dependences I vs. C were obtained in the concentrations range of oxalic acid between 0.5 to 3 mM, with LOD =0.05 mM, and recovery degree of 98%, without need of surface ...

We have fabricated a thin film of multilayered MnO2 whose interlayer is occupied with hexadecylpyridinium (HDPy) cations, using a simple anodic approach. The resulting film can effectively sorb iodide anions from aqueous solutions, even in the presence of NaCl or Na2SO4. The maximum sorption capacity was estimated to be 256 mg/g-MnO2, whereas a layered MnO2 film intercalated with K(+) ions show...