In many articles pollutants are being degraded by UVA rays, why UVA? What would be the impact if instead UVB or UVC was used? Is there any literature data available on how to choose between the three for specific applications?
The band gap of most efficient photocatalysts (ZnO,TiO2) is in the range of 3.0–3.3 eV.The suitable UV range which enhances photocatalytic activity of wide band gap semiconductors is UVA (315 to 400 nm).
if you are using TiO2, ZnO and CeO2 then you should choose UVA light because UVA light wavelength falls in the 320-400 nm range and is most suitable to initiate the excitation to create excitons.
Pure photoassisted degradation (without any semiconductors) depends normally on the UV-absorption spectrum of the compound to be degraded. If the compound is absorbing UV-A and you are applying stronger UV, either UV-B or UV-C, then the compound could faster be degraded, depending of course of its structure.
Hi,
It is clear the photocatalytic related to band gap values for the semiconductor materials and I strongly recommend following answer's Prof. Hassan Alshamsi.
Regards,
The question according to me refers to the UV assisted degradation. It is not mentioned at all something regarding semiconductors!
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Plating