Membrane production and gas purification integrated device, membrane production and gas purification method

A gas purification and air technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of low mineralization efficiency, easy deactivation, and difficulty in fixing nano-catalysts, so as to increase the effective area and contact time, preventing pollution deactivation, and improving the efficiency of photocatalytic reaction

Active Publication Date: 2020-04-17
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, photocatalysts are directly applied to degrade VOCs. Due to the fact that VOCs are difficult to effectively adsorb on the catalytic sites at low concentrations, the contact time between pollutants and catalysts is short, resulting in problems such as unsatisfactory degradation speed and low mineralization efficiency, and the generated small molecules The intermediate product is easy to desorb, and may also produce a more toxic intermediate product due to incomplete mineralization. In addition, there are disadvantages such as difficult fixation and easy deactivation of nanocatalysts.
These problems have seriously restricted the large-scale application of photocatalytic technology in the treatment of VOCs.

Method used

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  • Membrane production and gas purification integrated device, membrane production and gas purification method
  • Membrane production and gas purification integrated device, membrane production and gas purification method
  • Membrane production and gas purification integrated device, membrane production and gas purification method

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Embodiment 1

[0038] A membrane forming and gas purification integrated device of the present invention, such as figure 2 As shown, the integrated device for film making and gas purification includes an air compressor 1, a mixing buffer bottle 3 and a film making container 9 connected in sequence. on the support layer 5 of the support membrane.

[0039] In this embodiment, the mixing buffer bottle 3 is provided with a first inlet and a first outlet, the side of the film-making container 9 is provided with an air inlet and a feed return port, and the bottom is provided with an air outlet, which can be used during the film-making process. It can be connected to a vacuum pump for vacuum suction filtration, and can be used to connect a gas chromatographic detector to determine the concentration of VOCs during the gas purification process. The first inlet of the mixing buffer bottle 3 communicates with the air compressor 1 through the first pipeline 2, and the first outlet of the mixing buffer...

Embodiment 2

[0046] A membrane forming and gas purification method of the present invention comprises the following steps:

[0047] (S1) Membrane-making: adopt the membrane-making and gas purification integrated device of above-mentioned embodiment 1, first open feed pipe 7, close other pipelines, add the suspension (film-casting solution) containing graphene oxide and nano-photocatalyst In the film-making container 9, the air outlet of the film-making container 9 is connected to a circulating water vacuum pump, and the vacuum filtration method is used for suction filtration to obtain a graphene oxide-based photocatalytic film, and the graphene oxide-based photocatalytic film is processed by ultraviolet light After irradiating for 3 hours, during this process, the photogenerated electrons generated by the nano-photocatalyst reduce the graphene oxide to graphene, and a graphene-based photocatalytic film 15 is obtained.

[0048] (S2) Gas purification: open the first pipeline 2, the second pi...

Embodiment 3

[0055] Using the device of Example 1 and the method of Example 2, the only difference is that titanium dioxide nanotubes are replaced by titanium dioxide nanoparticles. When the ratio of raw materials is that the mass ratio of graphene oxide to nano photocatalyst is 1:0, 1:0.25, 1:0.5, 1:1, 1:2, 1:3, 1:4, 1:5, the nano When the particle size is from 20nm to 100nm, after XRD characterization and calculated by the Bragg formula, the interlayer spacing of the photocatalytic film can be increased from 0.896nm of the original graphene oxide to 1.532nm of the graphene embedded with nanoparticles, and the gas film permeation flux is 2ml / min increased to 580ml / min, the removal rate of toluene was 17%-98%, and the embedding of nanoparticles ensured a higher flux of air permeation during the separation process of the photocatalytic membrane.

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Abstract

The invention discloses an integrated device for film preparation and gas purification, and a method for film preparation and gas purification. The device comprises an air compressor, a mixing bufferbottle and a film preparation container, which communicate sequentially; a transparent top plate is arranged on the film preparation container; and a supporting layer used for supporting a film is arranged in the film preparation container. The method for film preparation and gas purification is implemented by adopting the integrated device for film preparation and gas purification, and comprisesa graphene-based film preparation process and a gas purification process. The integrated device is reasonable in design, simple in structure, and easy to operate; the integrated treatment of film preparation and gas purification is realized; synergistic effects of adsorption, photocatalysis, and film separation of the graphene-based photocatalytic film are fully exerted; and VOCs (volatile organicchemicals) can be removed effectively.

Description

technical field [0001] The invention belongs to the field of atmospheric pollutant control, and relates to an integrated device for film production and gas purification, and a method for film production and gas purification. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) not only have biological toxicity and "three causes" effects, but also are important factors that cause photochemical smog and other air pollution. Therefore, the effective control of VOCs pollution in the atmosphere and efficient air purification and other related work The research has always been highly valued at home and abroad. [0003] Semiconductor photocatalytic degradation technology has become a new technology for the rapid development of low-concentration volatile organic compounds (VOCs) in recent years due to the characteristics of simple equipment required, mild reaction conditions, low energy consumption, and less secondary pollution. The improvemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/72B01D53/74B01D53/00B01J21/18
CPCB01D53/007B01D53/74B01D53/8668B01D2255/802B01D2257/704B01D2257/708B01D2258/06B01D2259/804B01J21/18B01J35/004B01J35/065Y02A50/20
Inventor 刘贡钢胡进波刘元张翔李贤军
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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