A molecular extraction process for vanadium based on tandem selective complexation and precipitation.

Recycling vanadium from alternative sources is essential due to its expanding demand, depletion in natural sources, and environmental issues with terrestrial mining. Here, we present a complexation-precipitation method to selectively recover pentavalent vanadium ions, V(V), from complex metal ion mixtures, using an acid-stable metal binding agent, the cyclic imidedioxime, naphthalimidedioxime (HCID). HCID showed high extraction capacity and fast binding towards V(V) with crystal structures showing a 1:1 M:L dimer, [V(O)(CHNO)], 1, and 1:2 M:L non-oxido, [V(CHNO)] complex, 2.

Photocatalytic Degradation of 4-Nitrophenol by C, N-TiO: Degradation Efficiency vs. Embryonic Toxicity of the Resulting Compounds.

The photocatalytic activity of TiO based photocatalysts can be improved by structural modification and elemental doping. In this study, through rational design, one type of carbon and nitrogen co-doped TiO (C, N-TiO) photocatalyst with mesoporous structure was synthesized with improved photocatalytic activity in degrading 4-nitrophenol under simulated sunlight irradiation. The photocatalytic degradation efficiency of the C, N-TiO was much higher than the anatase TiO (A-TiO) based on absorbance and HPLC analyses.

Oil refinery wastewater treatment in the Niger Delta, Nigeria: current practices, challenges, and recommendations.

The extensive oil exploration has led to a series of environmental issues in the Niger Delta, Nigeria, over the years. Aside from oil spill, insufficient wastewater treatment of oil refineries and the discharged effluents become another potential source of pollution that has not received enough attention from the government and the public. Through reviewing the current oil refinery wastewater treatment processes and the discharge standards of wastewater effluents in Nigeria, we aimed to raise the awareness of the shortcomings of the current wastewater treatment technology and to discuss the consequences of insufficient treatment to the environment.