Photodegradation of Methylene Blue by TiO₂
C16H18ClN3S + TiO2 + hν → CO2 + H2O + degradation products
Overview
TiO₂ photocatalysis generates hydroxyl radicals and superoxide ions that mineralize organic pollutants like methylene blue into CO₂, water, and simple inorganic ions. Methylene blue serves as a standard test dye for evaluating photocatalyst performance because its degradation is easily tracked by its visible blue color fading.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Product | Carbon Dioxide CO₂ | 1 | (g) |
| Product | Water H₂O | 1 | (l) |
Everyday Example
Self-cleaning building facades use TiO₂ coatings that photocatalytically break down soot, smog deposits, and organic stains in sunlight.
Industrial Importance
TiO₂ photocatalysis is used in water purification, air treatment, self-cleaning surfaces, and anti-bacterial coatings.
Properties
- Type
- Photochemical
- Reversible
- No
- Energy
- Exothermic
- Catalyst
- TiO₂ (titanium dioxide)
Related Reactions
Chlorophyll Fluorescence
Cis-Trans Isomerization of Retinal
Dye-Sensitized Solar Cell (Grätzel Cell)
Firefly Bioluminescence (Luciferin Oxidation)
Luminol Chemiluminescence
Ozone Decomposition by UV
Ozone Formation by UV Light
Photocatalytic NOx Removal
Photocatalytic Water Splitting (TiO₂)
Photochemical Cycloaddition ([2+2])
Frequently Asked Questions
What is the equation for Photodegradation of Methylene Blue by TiO₂?
The balanced equation is: C₁₆H₁₈ClN₃S + TiO₂ + hν → CO₂ + H₂O + degradation products.
What type of reaction is Photodegradation of Methylene Blue by TiO₂?
Photodegradation of Methylene Blue by TiO₂ is a photochemical reaction.
Is Photodegradation of Methylene Blue by TiO₂ exothermic or endothermic?
Photodegradation of Methylene Blue by TiO₂ is exothermic (releases energy).
What conditions are needed for Photodegradation of Methylene Blue by TiO₂?
This reaction requires a catalyst (TiO₂ (titanium dioxide)).