Synthesis of Nanoporous TiO2 Thin Films for Photocatalytic Degradation of Methylene Blue

Abstract

This work reports a structure and photocatalytic activity of nanoporous titania (TiO2) thin films by an anodizing approach. Xray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM) studies showed that tetragonal anatase was the main phase in the thin films that consisted of countless disordered nanopores in the order of 10 to 15 nm. In the photocatalytic degradation of methylene blue, the titania thin films showed a good photocatalytic activity. 82.2 % methylene blue could be photodegraded by titania thin films with UV radiation. XPS results indicate that during the degradation of methylene blue, some Ti3+ may be partially oxidized to Ti4+ in the TiO2 films and the surface hydroxyls directly participate in the reaction. Our nanoporous titania thin films is commensurable to Degussa-25 TiO2 powders because the latter requires filtration in each treatment; it is also much superior to the direct photolysis approach with respect to photoactivity.

Hypergolic Synthesis of Inorganic Materials by the Reaction of Metallocene Dichlorides with Fuming Nitric Acid at Ambient Conditions: The Case of Photocatalytic Titania

“…The Raman spectrum of the as-made sample shows the simultaneous presence of TiO 2 and carbon (Figure 5 and inset). Titania is evidenced by an intense band at 145 cm −1 followed by three smaller intensity bands at 640, 515 and 395 cm −1 and a very weak shoulder just below 200 cm −1 [21,22]. These peaks correspond to the five Raman active modes of anatase, and overall, the spectrum matches well with that of Degussa P25 [22].…”

Bismuth Oxide Carbonate Structures Synthesized by Microwave—Assisted Solvothermal Approach and Its Use as Catalyst for the Degradation of Azo Dye in a Solution

“…There are a lot of pollutants in the water, among which are colorants and chemical substances. Industrial activities are significant contributors to the wastewater pollution of all the water sources in the world, different industries, among which is textile as one of the largest generators of wastewater due to the dyeing and finishing process, where azo dyes are used [1]. There are a lot of attractive approaches that has been used as treatment for this wastewater.…”