Photoelectrocatalysis device used for degrading gaseous-phase organic pollutant

Abstract

The invention discloses a photoelectrocatalysis device used for degrading gaseous-phase organic pollutant. The device comprises one or a plurality of photoelectrocatalysis elements positioned in a transparent main cavity and inserted on an element socket, wherein a low-voltage power supply module is connected with the element socket by a lead. The photoelectrocatalysis element consists of a substrate, an interdigital electrode and a photocatalyst layer, wherein the photocatalyst layer is composed of one layer of photocatalyst thin film or multiple layers of photocatalyst thin films. The optimized electrode structure ensures the greater photoelectricity synergistic effect under the very low voltage, and the simple layer structure is easy to be expanded, does not need extra power supply andcan not be limited by space. The device has simple structure, strong expandability and wide applicable field, does not need the special power supply and saves the energy source. Particularly, the photoelectrocatalysis element(s) can lead photoproduction electron-hole pairs in semiconductor photocatalyst material to be separated effectively at the extremely low voltage, thereby solving the problemthat photoelectricity-synergism catalytic degradation efficiency can be greatly improved at the low voltage.

Description

technical field [0001] The invention belongs to the field of photoelectric catalytic degradation of gas-phase organic pollutants, and in particular relates to a novel gas-phase photocatalytic component and a supporting device thereof. technical background [0002] With the development of society, human beings are facing more and more serious environmental pollution problems, especially air pollution. For example, formaldehyde, toluene and other volatile organic compounds released from interior decoration materials such as home furnishing, entertainment venues and automobiles. These harmful gases will cause serious damage to the human body and cause diseases such as the respiratory tract and internal organs. Therefore, it is particularly important to people's health to solve the air pollution problem caused by such volatile organic compounds. [0003] The traditional method for removing gas-phase organic pollutants is to use adsorbent materials with large specific surface ar...

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Problems solved by technology

The research reports on photocatalysis are mainly applied to the degradation of organic matter in aqueous solution, but there are very few reports on the degradation of organic matter in gas phase, especially the gas phase photoelectrocatalytic device suitable for low pressure (<1V) has not been reported yet.

[0010] Chinese patent CN1438913A (application number: 01810959.4) proposes a photoelectric catalytic system to remove air pollutants, but this design needs to apply a voltage of 3000-20000V to the discharge plate, and must contain a voltage booster, and high voltage exists for the human body Obvious security risks

Chinese patent CN1754615A (application number: 200410051710.3) proposes a photoelectric catalytic reactor for gas-phase degradation of pollutants, which has a complex structure and is not easy to expand, and it is difficult to meet the needs of different fields

[0011] Under the above circumstances, the inventors considered the disadvantages of the existing gas-phase photocatalytic devices, such as complex structure or the need for high-voltage power supply, and proposed a more ideal gas-phase photocatalytic device, which must meet two main requirements: 1. The device only needs Very low power supply voltage, and allow the catalyst to achieve significant performance improvement at low voltage, that is, to achieve better photoelectric synergy at lower energy consumption, and the voltage should be easily loaded on the catalyst

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