Enhanced photocatalytic and antimicrobial performance of a multifunctional Cu-loaded nanocomposite under UV light: theoretical and experimental study.

Due to modern industrialization and population growth, access to clean water has become a global challenge. In this study, a metal-semiconductor heterojunction was constructed between Cu NPs and the CoNiFeO/SiO/TiO composite matrix for the photodegradation of potassium permanganate, hexavalent chromium Cr(VI) and -nitroaniline (pNA) under UV light. In addition, the electronic and adsorption properties after Cu loading were evaluated using density functional theory (DFT) calculations.

Photoreduction of Cr(VI) in wastewater by anodic nanoporous NbO formed at high anodizing voltage and electrolyte temperature.

In this study, nanoporous anodic film was produced by anodization of niobium, Nb in a fluoride ethylene glycol electrolyte. The effect of anodization voltage and electrolyte temperature was studied to find an optimum condition for circular, ordered, and uniform pore formation. The diameter of the pores was found to be larger when the applied voltage was increased from 20 to 80 V.

Nanoporous anodic NbO with pore-in-pore structure formation and its application for the photoreduction of Cr(VI).

An anodic film with a nanoporous structure was formed by anodizing niobium at 60 V in fluorinated ethylene glycol (fluoride-EG). After 30 min of anodization, the anodic film exhibited a "pore-in-pore" structure; that is, there were smaller pores growing inside larger pores. The as-anodized film was weakly crystalline and became orthorhombic NbO after heat treatment.

Formation of grassy TiO nanotube thin film by anodisation in peroxide electrolyte for Cr(VI) removal under ultraviolet radiation.

Arrays of TiO nanotubes (TiO NTs) with grassy surfaces were observed on titanium foil anodised at 60 V in fluorinated ethylene glycol (EG) with added hydrogen peroxide (HO). The grassy surface was generated by the chemical etching and dissolution of the surface of the TiO NTs walls, which was accelerated by the temperature increase on the addition of HO . Upon annealing at 600 °C, the grassy part of the TiO NTs was found to consist of mostly anatase TiO whereas the bottom part of the anodic oxide comprised a mixture of anatase and rutile TiO.