The exploitation of new photocatalysts based p-n heterojunction is attracting the attention of the researchers due to its high photocatalytic performance. In this study, ZnWO4/BiOBr heterojunction were successfully prepared via a hydrothermal and a simple deposition method. The obtained ZnWO4/Bi...

Zinc tungstate nanoparticles with different sizes are produced through an electrolysis process including a zinc plate anode in sodium tungstate solution. The shape and size of the product was found to be controlled by varying reaction parameters such as electrolysis voltage, stirring rate of ele...

In this work, the enhanced performance of inverted bulk heterojunction (BHJ) organic solar cells (OSCs) using zinc oxide (ZnO):polyoxometalate (POM), in particular sodium metatungstate (Na6H2W12O40), nanocomposite films as electron extraction layers (EELs) is demonstrated. The addition in the pr...

This contribution deals with the synthesis, properties and investigation of the field of solid solutions formed between the three end-members of apatite-type alkaline earth element-yttrium-silicate oxybritholites with the hexagonal structure (P63/m). The stoichiometric composition of these compo...

Plants are characterized by differing capabilities to accumulate selenium. A model small-scale field experiment was set up to investigate the selenium (Se) uptake by twelve different plant species growing at an uncultivated meadow, as well as the effect of Se foliar application on the uptake of ...

Foliar spray of selenium (Se) has increasingly been applied to improve Se concentrations in crops. There is a lack of systematic and in-depth study comparing the effects of foliar spray with different Se sources at different growth stages. In this study, selenite or selenate (75 g Se ha−1) was s...

Three new organically templated or organically bonded zinc selenates, namely, {H2bipy}Zn(SeO4)2(H2O)21 (bipy=4,4′-bipyridine), {H2pip}{Zn(SeO4)2(H2O)4}·2H2O 2 (pip=piprazine), and Zn(SeO4)(phen)(H2O)23 (phen=1,10-phenanthroline) have been synthesized by hydrothermal reactions. The structure of...

LaeA is a conserved global regulator of secondary metabolism and development in filamentous fungi. Examination of Aspergillus fumigatus transcriptome data of laeA deletion mutants have been fruitful in identifying genes and molecules contributing to the laeA mutant phenotype. One of the genes si...

Increasing selenium concentrations in aquatic environments downstream of mine sites is of great concern due to selenium's bioaccumulation propensity and teratogenic toxicity. Removal of selenium from mine influenced water is complicated by the presence of nitrate, which is also elevated in ...

This study investigated the continuous biological removal of selenate [Se(VI)] in the presence of cadmium [Cd(II)] and zinc [Zn(II)] by anaerobic granular sludge in two upflow anaerobic sludge blanket (UASB) reactors operating under psychrophilic (17.5 ± 0.4 ℃) and mesophilic (30 ± 0.5 ℃) co...

The anaerobic bioreduction of selenate, fed in step (up to 60 mg.L−1) or continuous (∼7 mg.L−1) trickling mode, in the presence of gas-phase methanol (4.3–50 g m−3.h−1) was evaluated in a biotrickling filter (BTF). During the 48 d of step-feed and 41 d of continuous-feed operations, average se...

The mining industry needs to treat large volumes of wastewater highly concentrated in chemical compounds that can adversely affect receiving environments. One promising method of treatment is the use of reverse osmosis to remove most of the dissolved salts. However, the resulting brine reject is...

Semi-organic single crystals of pure tris (thiourea) zinc selenate (TTZS) were grown from aqueous solution by slow evaporation method. X-ray diffraction studies inferred the orthorhombic nature and Pca21 space group of the title crystal. The elemental analysis has been performed to ascertain the...

Copper and Zinc selenates were synthesized by wetchemical method employing selenic acid. The selenates were mixed with SnS2 in the ratio of 1:1:1 and annealed at 350˚and 450 °C to obtain CZTSSe. The synthesized CZTSSe possess absorption coefficient as high as 105 cm−1. The obtained band gap of ...

Tungsten powder reacts with an excess of the respective mixtures of alkali metal amides in autoclaves above 600°C to give the quarternary alkali metal nitrido tungstates(VI) Na2K[WN3] and Na11Rb[(WN3)4] embedded in alkali metals. The nitrides were isolated by extracting the metals with liquid a...

A coprecipitation method using calcium tungstate was developed to remove 87Sr isobaric interference with 87Rb prior to measurement of Rb by ID-ICP-MS. Precipitation of calcium tungstate was obtained by adding Ca(NO3)2 solution and (NH4)2WO4 solution to the sample, where (NH4)2WO4 was added more ...

High pressure has been one of key tools for discovering and accessing new phases and novel properties of materials. Under these extreme conditions, it is possible to obtain information about the structural instabilities and to probe the delicate balance between short and long range interactions,...

Alkali metal amides react above 600°C with tungsten powder in autoclaves to form nitrido tungstates(VI). Autoclaves are used for this type of reaction in order to avoid rapid decomposition of amides at relatively low temperatures to metal, nitrogen and hydrogen.Starting with an excess of the co...

Cubic pyrochlore-type tungstates of general composition A1.1W1.65O5.5 (where A=Rb, Cs) were synthesized by reacting hexagonal WO3 and alkali carbonates in the solid state at 300°C. The preparation of these new phases can be related to the structural analogy between the WO6 octahedra arrangement...

RésuméLa structure du tungstate de rubidium établie par Okada et al. (2) a fait l'objet d'un nouvel examen; des atomes de tungstène et d'oxygène supplémentaires ont été mis en évidence conduisant à la formulation Rb20+x(W4O6)13−x12W32O108. Les relations entre cette struc...