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Q1. What is exactly the photocatalysis?
A1. This is the decomposition of materials induced by light (or other radiant energy). The photolysis is a very slow and natural reaction which corresponds to the cleavage of one or more covalent bonds in a molecular entity resulting from absorption of light: The ultraviolet radiation removes the colour from the materials. The photocatalysts use the light energy, the water and the oxygen to create very reactive molecules, which are able to decompose organic and inorganic substances by oxidation‐reduction reactions.

Q2. What is a photocatalytist product?
A2. This is the product resulting from the reaction using a photocatalyst.

Q3. What is a catalyst?What is a photocatalyst?
A3. It is a substance which increases the rate of a reaction without itself being consumed or changed in the process (Illustration: a magnifying glass to make burn with some paper in the sun). A photocatalyst is activated under UV light.

Q4. Is the photocatalysis long‐lasting in the time?
A4. The photocatalyst is not consumed during the reaction; hence its effect is long‐lasting in the time.

Q5. What are the degradation products generated by the photocatalytist reaction?
A5. Organic compounds are oxidized and release molecules of oxygen, water and carbon dioxide. The amount of released CO2 is very low. Polluting gases harmful as NOx are decomposed into water and into nitrates. The quantity of released NO3‐ remains lower than that contained in a mineral water.