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Device and method of visible light photocatalytic degradation of gaseous formaldehyde with dye-sensitized TiO<2>

A dye sensitization, gas formaldehyde technology, applied in the field of photocatalysis, achieves high formaldehyde degradation efficiency, simple operation, and the effect of solving environmental pollution

Inactive Publication Date: 2017-05-10
JILIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to prove whether there are the same or similar literature reports in China within the scope of investigation, through the novelty search agency in 15 domestic databases, photocatalytic degradation / light reduction, dye sensitization / paint sensitization / pigment sensitization, organic matter / Organic molecules / organic pollutants / formaldehyde are the search terms. As of March 2016, a total of 152 domestically published Chinese documents have been retrieved, including 80 related documents and 7 closely related documents, but there is no dye identical to the present invention. Study on Degradation of Formaldehyde Gas by Sensitized Semiconductor Photocatalyst

Method used

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  • Device and method of visible light photocatalytic degradation of gaseous formaldehyde with dye-sensitized TiO&lt;2&gt;
  • Device and method of visible light photocatalytic degradation of gaseous formaldehyde with dye-sensitized TiO&lt;2&gt;
  • Device and method of visible light photocatalytic degradation of gaseous formaldehyde with dye-sensitized TiO&lt;2&gt;

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preparation example Construction

[0050] (3) Preparation of gaseous formaldehyde and detection of its concentration: first measure a certain amount of formaldehyde solution (36% formalin solution) and quickly place it in the reaction device and seal it away from light. After the formaldehyde solution is vaporized, use a gas sampler to extract a certain amount of formaldehyde gas into a gas absorption bottle with a certain amount of distilled water. The best sampling time for the initial concentration of formaldehyde is 3 hours after vaporization, and the measured initial formaldehyde concentration is 7.0mg / m 3 , this method has better selectivity and repeatability, and lower testing cost. The determination method of the degraded formaldehyde concentration is consistent with the above. TiO sensitized with three different dyes 2 The size of the working area of ​​the film is basically the same, about 7.1×10 -5 g / cm 2 , Humidity maintained in the range of 50% to 60%. The light time of the experiment was 12 hou...

Embodiment 1

[0064] (1) Reaction device: Considering factors such as environmental protection, economy and applicability, combined with the above-mentioned factors affecting the design of photocatalytic reactor, the final self-designed figure 1 The experimental reaction setup is shown. Visible light catalytic degradation formaldehyde reaction device is a customized size of 50cm × 50cm × 80cm, the actual capacity is V 0 =0.3485m 3 The stainless steel cubic container is equipped with an interface for connecting a formaldehyde gas sampler, through which the gas sampler will extract the formaldehyde gas in the container, and then perform concentration detection. Considering factors such as the fluidity of the gas, the temperature and humidity of the system, a fan, a xenon lamp, and a probe of a temperature and humidity meter are placed inside the reaction device. In order to better control the temperature of the system and prolong the service life of the light source, a cold trap is placed i...

Embodiment 2

[0069] (1) Use a self-designed reaction device and explore the stability of the device. The specific method is as in (1) and (2) steps in Example 1.

[0070] (2) Using TCPP as TiO 2 Films of dye sensitizers were then subjected to subsequent experiments.

[0071] (3) The national standard "HJ 601-2011: Determination of water quality-formaldehyde, acetylacetone spectrophotometry" was used to measure the gas formaldehyde concentration. The specific operation was to measure a certain amount of formaldehyde solution (36% formalin solution) quickly Put it in the reaction device and seal it away from light, and then heat the reaction device containing the formaldehyde solution. After the formaldehyde is completely vaporized, use a gas sampler to extract a certain amount of formaldehyde gas into a gas absorption bottle with a certain amount of distilled water. The sampling time point is to measure the initial formaldehyde concentration when the gasification is complete for 3 hours. ...

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Abstract

The present invention relates to a device and method of visible light photocatalytic degradation of gaseous formaldehyde with dye-sensitized TiO<2>, and belongs to the field of photocatalysis. The device is mainly composed of a stainless steel cubic reaction vessel, a constant temperature water bath tank, a gas sampler, a diaphragm vacuum pump and a gas absorption bottle. The method using the reaction device comprises the following steps: a dye-sensitized TiO<2> thin film is used as a base material, then a formaldehyde standard liquid and the dye-sensitized TiO<2> thin film are put into the reaction device, the initial formaldehyde gas concentration after a vaporization balance is detected, then light source is turned on to conduct the photocatalytic degradation experiment of the gaseous formaldehyde, after 3 h of the lighting, a sampling inspection of the degraded formaldehyde concentration is conducted, the degradation rate of the formaldehyde is calculated to obtain the degradation rate of the gaseous formaldehyde after the photocatalytic degradation with the dye-sensitized TiO<2>. The device has many advantages of being circular and high in efficiency, green and healthy, simple in operation, low in costs, etc., and has important values and research significances for solving environmental pollution, indoor air purification, etc.

Description

technical field [0001] The invention belongs to the field of photocatalysis and relates to dye-sensitized TiO 2 The preparation method of photocatalytic materials and its application in visible light catalytic degradation of formaldehyde gas, specifically using self-designed reaction device to study TCPP dye-sensitized TiO 2 Factors influencing the efficiency of thin film photocatalytic degradation of gaseous formaldehyde to identify efficient and feasible dye-sensitized TiO 2 The optimal system and related laws for the degradation of gaseous formaldehyde. Background technique [0002] Because the energy of solar energy accounts for more than 99% of the total energy on the earth, its inexhaustible, inexhaustible, and environmentally friendly features make people constantly explore how to make full use of solar energy. But people use more solar energy in the ultraviolet band, and the energy of ultraviolet light only accounts for 5% of the energy of solar light irradiating t...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/72G01N21/31B01J31/02
CPCB01D53/8668G01N21/31B01J31/0244B01D2255/802B01D2257/708B01D2255/20707B01J35/39
Inventor 文子张玲利成荣敏詹从红蒋青韩冬梅李娜
Owner JILIN UNIV
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