Composite photocatalytic reaction system for eliminating environmental pollutants in air or water efficiently
A technology for environmental pollutants and composite photocatalysis, which is applied in the field of composite photocatalytic reaction systems for efficiently eliminating environmental pollutants in air or water, can solve problems such as unsatisfactory effects, and achieve improved photocatalytic conversion rate and stability. The effect of improving catalytic decomposition efficiency and activity stability
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Embodiment 1
[0024] A photocatalyst is added to the aqueous solution or it is loaded on the electrode material as a film and placed in the aqueous solution, and the light source is placed in the solution or the container is equipped with a light source to form a photocatalytic water splitting system. Its characteristic function is: apply sunlight or artificial light source with a wavelength of 200-800nm to the catalyst in the water photocatalytic photodecomposition system to decompose water on the surface of the catalyst to generate hydrogen and oxygen. This photocatalytic hydrogen production unit can have various structures. The photocatalytic hydrogen production unit shown in Figure 5 is a suspension system, that is, the photocatalyst is added to water, and the water is decomposed into hydrogen and oxygen by irradiating with ultraviolet light or visible light from outside or inside the tube. An electrode system coated with a photocatalyst can also be used as a photocatalytic hydrogen p...
Embodiment 2
[0029] Insert two platinum electrodes into an aqueous solution containing a small amount of electrolyte to form a common water electrolysis device, apply a certain voltage to electrolyze water to generate hydrogen and oxygen, and form a hydrogen production unit that meets the needs of the second unit as required. The characteristics and functions of this device are: it can conveniently control the release amount of hydrogen and oxygen, and the generated gas can be conveniently brought into the photocatalytic pollutant decomposition unit by the pre-gas.
[0030] The photocatalytic pollutant decomposition unit is the same as that in Embodiment 1.
[0031] The electrolytic water hydrogen production unit used in this composite photocatalytic reaction system adopts the conventional electrolytic water device shown in Figure 6.
Embodiment 3
[0033] As shown in Figure 4, for the photocatalytic decomposition of pollutants in solution, a single reactor can be used to simultaneously suspend a photocatalyst for photolysis of water and a photocatalyst for decomposition of pollutants in an aqueous solution containing pollutants, The suspension is irradiated with ultraviolet light or visible light from the outside or inside, and the hydrogen and oxygen generated by the photocatalyst for water splitting are utilized by the photocatalytic process of pollutants; dual-functional photocatalysts can also be used to quickly decompose pollutants in the same way; The electrode system can also be used to coat the photocatalyst on the surface of the electrode and apply a certain bias voltage and light to couple the photocatalytic hydrogen production process of the system with the photocatalytic decomposition process of pollutants to achieve the purpose of efficiently decomposing pollutants.
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