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As the main equipment of the photocatalytic reaction, the photocatalytic reactor determines the performance of the catalyst activity and the utilization of the light source, and these two factors directly determine the efficiency of the photocatalytic reaction
.
A successful reactor must reflect the optimal combination of catalyst activity and light source utilization
4.
2.
3.
1 Reactors with different light sources
According to different light sources, photocatalytic reactors can be divided into two types: ultraviolet light and solar photocatalytic reactors
.
Currently, mercury lamps, black lamps, argon lamps, etc.
4.
2.
3.
2 Reactors with different flow regimes
According to the presence of catalysts in the flow cell, photocatalytic reactors can be divided into suspension photoreactors, coated catalyst reactors, and fixed-bed photocatalytic reactors
.
(1) The early photocatalysis studies of suspension photoreactors mostly focused on suspension phase photocatalysis
.
This type of reactor usually adds photocatalyst powder to the solution to be treated
A suspension composed of TiO 2 and a waste water solution containing harmful substances is passed through a ring-shaped, straight-through or coaxial quartz tube interlayer to form a flow cell, and the radiation light source directly radiates the flow cell
.
This type of reactor has a simple structure and can maintain the inherent activity of the catalyst through the above method, but the catalyst cannot be used continuously.
(2) Coated catalyst reactor Coated catalyst reactor sprays TiO 2 and other semiconductor materials on the inner and outer walls of the reactor, optical fiber material, lamp tube wall, porous glass, glass fiber, glass plate or steel wire mesh, and the catalyst film is in ultraviolet light.
Under the irradiated by, the pollutants adsorbed on the surface of the membrane will be degraded and mineralized
.
The TiO 2 in this form is not easy to lose, but the catalyst reduces its activity due to fixation, and the water pressure entering the reactor needs to be increased during operation.
Figure 4-2 Semi-batch loop reactor
Figure 4-3 Multiple hollow tube reactor
Figure 4-4 Optical fiber reactor and honeycomb block reactor
Scholars simple powder - sol-gel method, in the conventional glass capillary Nano Ti02 2 film, which is developed a microreactor having a higher photocatalytic performance, TiO investigated by nano- 2 concentration and nano Ti02 2 coating layers, The optimal conditions for preparing capillary nano-TiO 2 coatings were determined to obtain the best photocatalytic performance, and applied to the photocatalytic reduction reaction of benzaldehyde
.
(3) Fixed-bed photocatalytic reactor According to the different way of fixing the photocatalyst, the fixed-bed photocatalytic reactor can be divided into the following two different reactors: a.
Unpacked fixed-bed photocatalytic reactor
Figure 4-5 Packed bed photocatalytic reactor
In addition to the above-mentioned reactors, the reactor currently on trial is a photoelectrochemical catalytic reactor
.
In this type of reactor, a thin layer of catalyst is plated on conductive glass as the anode (working electrode), platinum wire as the cathode, and calomel electrode as the reference electrode, forming a three-electrode chemical cell
