This review paper provides a comprehensive overview of the recent trends in bismuth tungstate (Bi ₂ WO ₆ ) research, covering its structural, electrical, photoluminescent, and photocatalytic properties.

The growing apprehension surrounding heavy metal pollution in both environmental and industrial contexts has spurred extensive research into adsorption materials aimed at efficient remediation.

The adsorption of small molecules $({\mathrm{N}}_2,$ ${\mathrm{O}}_2,$ CO, ${\mathrm{CO}}_2,$ ${\mathrm{H}}_2\mathrm{O},$ and HF) in model ropes of carbon nanotubes has been studied to determine the main parameters (stable adsorption sites, potential barriers, $\dots )$ which define the ability of carbon nanotubes to select small molecules through their different behavior in the diffusion mechanism. When the polarization of the nanotubes is taken into account in the semiempirical potentials, it has a significant influence on the adsorption of polar species. Examination of the potential maps along the ropes shows that the nature and the stability of the adsorption sites are strongly dependent on the molecular species and on the diameter of the tubes. For a small rope formed with (10,10) single-wall nanotubes, different trapping sites are favored by the molecules considered. Furthermore the corresponding trapping well depths are sufficiently selective to discriminate the species. Improving the size homogeneity of the ropes and judiciously calibrating their diameter would provide an efficient mean of selecting molecular species.

The carbonatation of La₂O₃oxide and the decarbonatation of lanthanum carbonate phase La₂O₂CO₃are investigated using thermal and thermogravimetry analyses under CO₂gas flow. The initial phase La₂O₃is first elaborated from pyrolysis of a LaOHCO₃precursor. Then, thermal and thermogravimetry analyses are carried out under CO₂flow, as temperature increases then decreases. The carbonatation kinetics of La₂O₃is determined at three fixed temperatures. Electrical impedance spectroscopy is performed to determine the electrical responses associated with ionic mobilities and phase changes, in the temperature range 25 to900∘C. The electrical conduction during heating underCO2gas flow should be linked to two regimes of ionic conduction of the carbonate ions. From these electrical measurements, the ionic mobility of carbonate ionsCO3 2−is found to be close to 0.003 ⋅10−4 cm2 s−1 V−1at750∘C for the monoclinic La₂O₂CO₃phase.