The technical parameters of photocatalytic reactors are crucial for their efficient operation and performance. However, it's worth noting that these parameters can vary depending on the specific application and design of the reactor. Here are some key technical parameters that are commonly considered:

1. Reactor Geometry:

• Shape and size: The reactor's shape and size influence the flow pattern of the reactants and the distribution of light within the reactor.

• Internal structure: The design of the internal walls, baffles, and other structures can affect fluid dynamics and light scattering.

2. Photocatalyst Type and Loading:

• Type of photocatalyst: Different photocatalysts have varying absorption efficiencies for different wavelengths of light and different catalytic activities.

• Loading: The amount of photocatalyst present in the reactor affects the reaction rate and efficiency.

3. Light Source and Irradiation:

• Type of light source: Options include UV lamps, LEDs, or natural sunlight.

• Intensity and wavelength: The intensity and specific wavelength of the light source should match the absorption spectrum of the photocatalyst.

• Light distribution: Uniform distribution of light within the reactor is essential to ensure efficient utilization of the photocatalyst.

4. Fluid Dynamics:

• Flow rate: The flow rate of the reactants through the reactor affects the residence time and mixing, which in turn influence the reaction rate.

• Fluid properties: The viscosity, density, and chemical composition of the fluid can affect the reactor's performance.

5. Operating Conditions:

• Temperature and pressure: These conditions can influence the reaction kinetics and the stability of the photocatalyst.

• pH and other chemical parameters: These can affect the solubility, reactivity, and stability of the reactants and products.

6. Reactor Material and Construction:

• Material of construction: The reactor should be made of materials that are compatible with the reactants and products, and that can withstand the operating conditions.

• Sealing and leak-tightness: Proper sealing is essential to prevent leakage of reactants, products, or light.

7. Energy Efficiency and Environmental Impact:

• Energy consumption: The reactor should be designed to minimize energy consumption while maintaining high reaction efficiency.

• Environmental footprint: Consideration should be given to the reactor's impact on the environment, including waste generation and potential emissions.

In addition, for specific applications such as water or air treatment, there may be additional parameters related to the treatment process, such as the removal efficiency of contaminants, the residence time of the fluid in the reactor, and the recovery or disposal of the photocatalyst.