Sodium hexametaphosphate (SHMP) was used to minimize the adverse effect of serpentine for improving ascharite recovery. The effects of particle size and content of SHMP, and serpentine on ascharite flotation process were investigated through flotation, zeta potential tests, FT-IR analysis, XPS a...

Damage to the water resources and environment as a consequence of oil production and use of fossil fuels, has increased the need for applying various technologies and developing effective materials to remove contaminates from oily wastewaters resources. One of the challenges for an economic indu...

Ternary cadmium zinc sulfide (Cd1−xZnxS) thin films were deposited by chemical bath deposition method for the entire range of 0 ≤ x ≤ 1 from acidic chemical bath using tartaric acid and hydrazine as a complexing agents. The X-ray diffraction (XRD) studies revealed that the deposited thin films...

Changes in the spectral dependences of the optical absorption induced in the bismuth titanium oxide crystal doped by aluminum as a result of sequential exposition to cw laser radiation first with the wavelength λi = 532 nm and then with the longer wavelength λn = 633, 655, 663, 780, 871, or 10...

TiO2 has been widely studied for photocatalytic applications; however, its band gap is so large (Eg = 3.2 eV for anatase) that it can only be excited by ultraviolet light which accounts for only 5% of the incoming solar energy. Thus, it is important to develop a visible light driven photocatalys...

Oxide coatings formed on titanium in electrolytes with Na2B4O7 or Na2SiO3 by the method of plasma electrolytic oxidation and containing TiO2 or SiO2, respectively, were impregnated in an organic solution of bismuth and, thereafter, annealed in air at 700 °C. As a result, layered oxide coatings ...

A new dinuclear vanadium(IV) complex [(VO)2(μ-HBPA)2(μ-SO4)].4.75H2O was synthesized by the reaction between a bipodal N2O-donor ligand N-(2-hydroxybenzyl)-N-(pyridin-2-ylmethyl)amine (HBPA) and vanadyl sulfate. The complex was characterized by elemental analysis, thermogravimetric, electroche...

A novel, highly anionic hydrogel, sulfated katira gum-crosslinked-poly(acrylic acid) (SKG-cl-PAA) was prepared by sulfation of katira gum-crosslinked-poly(acrylic acid) (KG-cl-PAA) hydrogel using chlorosulfonic acid (ClSO3H) in presence of anhydrous pyridine and formamide. Both the hydrogels KG-...

Conductance measurements of vanadyl sulfate have happened in binary mixed solvent with alcohol mass fraction 0%, 30% and 50% (W/W) (EtOH-H2O) at different temperatures from 298.15 to 313.15 K (with a step of 5 K). The experimental data have been analyzed by using the Fuoss-Hsia-Fernández-Prini ...

A modification of the aqueous addition method for the synthesis of apatites is described. This one-step method does not require addition of reagents and no adjustment of solution pH and therefore requires less equipment and less time than the traditional aqueous addition method. It can be used w...

Small proportions (5 and 10 wt.%) of strontium vanadate (Sr3(VO4)2) were added to strontium-doped lanthanum chromite (La0.85Sr0.15CrO3) to produce high density fuel cell interconnect materials in air at 1550°C without adversely affecting the desirable properties of the material. Compositions in...

The deactivation upon oxidative treatments of solid oxide fuel cell (SOFC) anodes based on La0.7Sr0.3VO3.85 with a Pd/ceria catalyst is examined using electrodes formed by infiltration of La0.7Sr0.3VO3.85, Pd, and ceria into porous yttria-stabilized zirconia (YSZ). Based on XRD results, performa...

The reversibility of redox-induced phase transformations and accompanying electrical conductivity and dimensional changes in perovskite-type SrVO3−δ, a parent material for a family of potential solid oxide fuel cell anode materials, were evaluated employing X-ray diffraction, thermal analysis, ...

Three new strontium manganese vanadates, Sr2Mn2(V3O10)(VO4) (I), Sr3Mn(V2O7)2 (II), and Sr2Mn(VO4)2(OH) (III), were prepared using a high temperature (580 °C) hydrothermal method with various chloride salts as the mineralizer. Minor differences in the chloride stoichiometry led to significant d...

The subject of this paper is the structural and luminescence properties of selected rare earth ions in lead germanate glasses. Glasses were obtained by conventional high-temperature melt-quenching technique. Europium, dysprosium and terbium ions were chosen as active dopants. The spectroscopic p...

Glasses in the system xGd2O3(100 − x)[7GeO2·3PbO] with 0 ≤ x ≤ 40 mol% have been prepared from melt quenching method. The influence of gadolinium ions on structural behavior in lead–germanate glasses has been investigated using FTIR, UV-VIS and EPR spectroscopy. The structural changes have b...

Glasses in the system xEu2O3·(100 − x)[7GeO2·3PbO2] with 0 ≤ x ≤ 25 mol% have been prepared from melt quenching method. Influence of europium ions on structural behavior in lead-germanate glasses has been investigated using infrared spectroscopy and DFT calculations. The structural changes h...

The present work is focused on the enhancement of network former environment in lead-germanate glasses by bismuth ions doping. A series of bismuth–lead-germanate glasses with the xBi2O3·(100 − x)[7GeO2·3PbO] composition glass where 0 ⩽ x ⩽ 30 mol% Bi2O3 were synthesized by melt-quenching meth...

We measured the absorption coefficients and extinction ratio of ferroelectric lead germanate in the range of 0.2 – 1.2 THz by means of terahertz time-domain spectroscopy. We observed dramatic changes in the dichroism of the crystal induced by temperature shifts between 300 K and 493 K. We estim...

InfraRed, UltraViolet–visible and Electron Paramagnetic Resonance Spectroscopies were employed to investigate the xMnO ∙(100 − x)[7GeO2 ∙ 3PbO2] vitreous system, where x = 0–50 mol% MnO, in order to obtain valuable information about the competitive role played by the manganese ions in manganes...