Tower photocatalytic device and catalytic method thereof

Abstract

The invention discloses a tower photocatalytic device and a catalytic method thereof. The tower photocatalytic device comprises a cavity with a double-layer structure, a first suction pump, a second suction pump and a circuit system, wherein the cavity is composed of an inner cavity and an outer cavity, a light source is arranged in the inner cavity, a block photocatalyst is arranged in the outer cavity, and a water inlet is formed in the bottom of the outer cavity; one end of the first suction pump is connected with the water inlet of the outer cavity through a hose, and the other end of the first suction pump is connected with a sewage pool through a hose; one end of the second suction pump is connected with an opening in the upper end of the outer cavity through a hose, and the other end of the second suction pump is connected with a reservoir through a hose; the circuit system is used for controlling the light source, the first suction pump and the second suction pump to operate, and switches of the circuit system are all installed on the outer side surface of the outer cavity. The preparation method is simple and easy to implement and has the advantage of low cost; the photocatalytic device adopts block catalytic materials, so that the recycling of the catalyst is facilitated, and large-scale treatment can be performed on sewage by using a photocatalytic technique.

Description

technical field [0001] The invention relates to a photocatalytic device, in particular to a tower photocatalytic device and a catalytic method thereof. Background technique [0002] In today's society, environmental pollution has become a global problem that needs to be solved urgently. Photocatalytic technology has gradually attracted widespread attention in the scientific community due to its potential application in environmental purification (R. Quesada-Cabrera, et al., Applied Catalysis B, 2014, 160, 582- 588.). Photocatalytic technology refers to the separation of electrons and holes inside the photocatalytic material under the irradiation of ultraviolet light or visible light, and the hydroxyl radical·OH and superoxide ion·O generated on the surface of the catalytic material 2- , hydroperoxy·HO 2 Such active groups can directly oxidize organic matter to CO 2 and H 2 O and other small inorganic molecules (J. Yang, et al., J. Phys. Chem. B, 2005, 109, 21900-21907.)....

AI Technical Summary

Problems solved by technology

[0004] 1. In the photocatalytic reaction, continuous stirring is required to make the catalyst contact with the pollutants, otherwise the catalyst will naturally settle to the bottom of the container, which is difficult to achieve in large-scale sewage treatment applications;

[0005] 2. The catalyst is difficult to recycle;

[0006] 3. The photocatalytic sewage treatment technology with agitation / aeration has the disadvantages of small treatment capacity per ton of water, large footprint, and sequential batch operation

These shortcomings restrict the practical application of photocatalytic technology to a certain extent.

[0007] In order to overcome the shortcomings of the photocatalytic process that requires stirring and the photocatalyst is difficult to recycle, Athanasekou et al. prepared TiO 2 Composite nano film with graphene as photocatalytic material to degrade sewage

Although the catalyst is used in the form of a thin film to overcome the shortcomings of powders that are difficult to recycle, but in the large-scale use of photocatalytic degradation of urban sewage, nano-films are difficult to practically apply due to the difficulty of large-scale synthesis

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