What is photocatalyst material?
A photocatalyst is a material which absorbs light to bring it to higher energy level and provides such energy to a reacting substance to make a chemical reaction occur.
What is photocatalytic degradation?
Photocatalysis is an ecofriendly technique that emerged as a promising alternative for the degradation of many organic pollutants. The application of photocatalysts in treating persistent organic pollutants such as pesticide, pharmaceutical compounds, oil and grease and textile in real wastewater was also discussed.
What is photocatalysis process?
Photocatalysis is a process in which light energy is used to drive pairs of chemical reactions. Through the absorption of light, an excited electron/hole pair is produced.
How is photocatalytic activity measured?
The solution is decolourated in the process. Throughout the measurement, the colour concentration of the solution is measured by UV-vis spectroscopy. For the determination of the photocatalytic activity, the adsorption is measured. The degradation rate of the test sample surface is determined by these measurements.
Why semiconductors are used in photocatalysis?
This technology is based on the use of a semiconductor that can be excited by light with an energy higher than its band gap, inducing the formation of energy-rich electron-hole pairs, which can be involved in redox reactions.
Does photocatalysis produce ozone?
PCO does not emit harmful substances that might harm the ozone layer nor does it produce ozone. The photocatalytic oxidation technology uses nanoparticle science to destroy pathogens causing respiratory diseases. It helps breakdown ozone regardless of its chemical makeup into water and carbon dioxide.
Does UV light purify air?
UV lights do improve air quality because they are a sanitation device. A UV light can inactivate biological aerosols that affect indoor air quality, including mold, mildew, fungus, bacteria, and viruses. Therefore, having an ultraviolet light mode on an air purifier can improve the air purification quality of the unit.