Photocatalytic decomposition of methylene blue by Cr/TiO₂ composite coatings

Abstract

In this research, the Cr/TiO 2 composite coatings were formed in Na 2 HPO 4 + NaOH + Cr 2 O 3 by micro-arc oxidation (MAO) technology with different ratios of anodic and cathodic currents. Surface morphology results showed that the pancake-like structures on the coating surface decreased with the ratio decreased. XRD results showed the TiO 2 :Cr 3+ coatings are composed of anatase and rutile phase and the anatase content first increased and then decreased. XPS results indicated that Ti2p spin-orbit components of the Cr/TiO 2 composite coatings are shifted towards higher binding energy, compared with the pure TiO 2 coating, suggesting that some of the Cr 3+ ions are incorporated into TiO 2 lattice. The photocatalytic experiment results showed that the photocatalytic activity of Cr/TiO 2 MAO coatings can be greatly enhanced with a moderate amount of Cr 3+ .

The microstructure and optical properties of novel Al2O3–Ag composite coating

“…Subsequently, the adsorbed particles can be co-deposited with growing aluminium oxide layer. The particles in the electrolyte can be incorporated into the growing oxide layer under the strong electric field [32,33]. Anionic surfactant has two effects including the stabilization of the particles in the solution and the formation of the negatively charged particles.…”

Tio2 coating on alumina membranes for continuous separation of dyes

“…Under UV irradiation, TiO 2 produces reactive oxygen species, which can effectively degrade pollutants and disinfect a variety of organisms. Recently, many researchers have focused on immobilising TiO 2 photocatalysts with ceramic membranes to improve the separation efficiency [5,9,16,[25][26][27]. However, it is still challenging to realise the continuous separation of wastewater and the regeneration of polluted membranes by a simple method.…”