TiO2 coatings prepared by sol-gel and electrochemical methodologies

Integration of renewable energy in wastewater treatment during COVID-19 pandemic: Challenges, opportunities, and progressive research trends

“…There are several publications describing photocatalyst solar systems for air and water purification. A solar-energy-based photocatalyst degradation of formaldehyde (HCHO) was investigated by ( Litter et al 2020 ). A TiO 2 sol-gel film covered the inner surface of the borosilicate glass reactor.…”

Smooth semicompact multilayer coating of TiO2 obtained by combining anodic oxidation and sol-gel techniques

“…TiO 2 coatings can be obtained through a wide variety of methods, such as chemical vapor deposition, physical vapor deposition, electrodeposition, electrophoresis, laser ablation, anodization, thermal oxidation of Ti metal, sputtering, cathodic arcs, electrochemical methods, solgel, impregnation, ion implantation, etc. Although some of these techniques are expensive and/or very complex [20][21][22], the sol-gel method and the electrochemical method of anodic oxidation are low-cost and simple and also allow great versatility in terms of the composition, crystallinity, thickness, roughness and nanostructure of the TiO 2 coating obtained [20].…”

Photocatalytic and mechanical properties of immobilized nanotubular TiO2 photocatalysts obtained by anodic oxidation: a novel combined analysis

“…Suspensions of TiO 2 nanoparticles in water are generally employed in photocatalytic systems [2][3][4]. However, despite its technological potential, this system has been scarcely developed due, among other drawbacks, to the need to include a step of separation and recovery of the TiO 2 nanoparticles from the suspension, which increases the cost of the process ( [5] and references therein). As an alternative, the use of nanostructured immobilized TiO 2 photocatalysts, strongly bonded to a supporting material, with a high photocatalytic activity and mechanically resistant has been investigated to make the photocatalytic process more robust, simple, effective and with a low cost [6], especially for use in photoreactors [7][8][9].…”

“…As an alternative, the use of nanostructured immobilized TiO 2 photocatalysts, strongly bonded to a supporting material, with a high photocatalytic activity and mechanically resistant has been investigated to make the photocatalytic process more robust, simple, effective and with a low cost [6], especially for use in photoreactors [7][8][9]. Nanostructured immobilized TiO 2 can be prepared by a wide variety of methods such as chemical vapor deposition (CVD), physical vapor deposition (PVD), electrodeposition, electrophoresis, laser ablation, anodization, metallic Ti thermal oxidation, spray plasma, sputtering, cathodic arcs, electrochemical methods, sol-gel, impregnation, ion implantation, and direct impregnation of a support with a TiO 2 suspension ( [5] and references therein). At present, the efforts on the use of TiO 2 in photocatalytic systems are focused on the production of one-dimensional nanostructures such as nanotubes, which have geometrical, optical, electronic, and chemical advantages, permitting a fast electron transport and a low electron-hole recombination [10].…”