I did experiment on dye degradation using pure and doped TiO2. Both turned the solution colurless after photocatalysis. Is it possible for pure TiO2 to degrade the dye?
Dear Sarat.
Sure it is possible. Just be careful about the conditions you conduct your experiments at. Since CR is anionic dye, it is important what is the pH of your solutions. At pH=7 P-25 will be negatively charged, hence you will have little adsorption of CR, which will affect degradation rate.
Check also this recent publication for more information:
D. Ljubas et al. / Journal of Environmental Management 161 (2015) 83-91
http://www.sciencedirect.com/science/article/pii/S0301479715301341
Regards.
yes pure TiO2 also have the ability to degrade the dye. But the efficiency of the photocatalyst is less than the doped one. But it depends on doping materials you are used.
Sure. TiO2 is a very good photocatalyst. Hence it could decolourize congo red dye in acidic pHs more effectively than at basic pHs. Because congo red dye is a diazo (anionic) dye. But we have to be careful since the dye changes its colour depending on the pHs. At acidic pHs around 5.8 it has red colour and below this it has a blue colour.
Also the adsorption of dye molecules which is a significant process in the photocatalysis is affected by the zero point charge of the catalysts (depends on pHs of the medium).
Doping of a metal could either enhances or suppresses the photocatalysis. This depends on the nature of the dopant.
- Badges
- Science topic
- Similar topics
- Chemistry
- Biochemistry
- Biochemical Techniques
- Blotting Techniques
- Immunoblotting
- Dyes