A typical photoreactor consists of several essential components: 1. Light Source: This can be LEDs, mercury lamps, or solar concentrators, tailored to provide the specific wavelength required for the reaction. 2. Reactor Vessel: Made from materials like quartz or borosilicate glass, which allow light to pass through with minimal absorption. 3. Catalyst: Often a photocatalyst like titanium dioxide or a photosensitive material that can absorb light and facilitate the reaction. 4. Cooling System: To dissipate excess heat generated by the light source, preventing thermal degradation of reactants or products.