English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Here we prepare TiO 2  films and coupled SnO 2 /TiO 2  films on glass substrates by using dip coating and spin coating and test their photocatalytic action with respect to the degradation of methylene blue in a water solution. The SnO 2  layer of the mixed SnO 2 /TiO 2  films is deposited on the glass by different methods to vary its properties: thickness, grain size and surface morphology. The TiO 2  films are deposited on the SnO 2  film by dip coating from a suspension of Degusssa P25 powder. Of better performance are the TiO 2  films prepared by spin coating due to the improved film morphology. The coupled films SnO 2 /TiO 2  (10-cycles SnO 2  and 1-cycle TiO 2 ) are of much better photocatalytic activity than the respective counterparts of pure SnO 2  and TiO 2  films. The SnO 2  film prepared from sol-gel increases in a similar way the photocatalytic activity of the TiO 2 -film overcoat. In general, the kinetics of photocatalysis in a quiescent liquid is found to obey a two-stage mechanism, which is described quantitatively by a theoretical model assuming fast initial adsorption of the dye on the film followed by slow dye degradation. This model allows distinguishing fine details in the experimental data attributed to the effects of various factors on the photocatalytic action of the films.

Photocatalysis with TiO 2 and SnO 2 /TiO 2 Films Examined by a Kinetic Model