Design Process


Future Technology
Design Process


Three Other Potential Designs

During our development of our final idea, our group reached three other potential ideas that would work, just not as efficiently.

Design #1: Thermo-energy

The first idea was using thermo-energy to heat up TiO2, allowing electrons to cross band gaps.  However, these temperatures would have to be very high to reduce the energy needed to that which is obtainable from visible light.  It would require a lot of energy as well, making the technology quite expensive and inefficient.

Design #2: Other Catalysts

The second idea was to use other semiconductors to act as catalysts.  These included iron oxides, such as Fe2O3, with an Eg of 2.2 eV, and metal sulfides, such as CdS, which has an Eg o f2.5 eV.  However, these semiconductors may be unstable and vulnerable to corrosion.

Design #3: Bombardment

The final choice was to use electron beams to bombard TiO2 to move electrons from the valence band to the conduction band.  However, this is too expensive and requires a lot of modern high-tech equipment.  Furthermore, it would be difficult to implement in everyday on-site solutions, a very impractical choice.

Visible-Light Photocatalysis: A Cleaner Way of Life

Home | Photocatalysis | History | Future Technology | Breakthroughs | Design Process | Consequences | Bibliography | Feedback

This site was last updated Wednesday, April 06, 2005 08:34:01 PM.