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Method for determining total concentration of organic gas in environmental gas by photocatalytic fuel cell (PFC) photoelectrocatalysis method

An organic gas and ambient gas technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of long time, complicated operation, insufficient detection range to cover TVOC components, etc., to achieve the effect of no secondary pollution and short measurement time.

Active Publication Date: 2012-01-04
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

These detection methods are complicated to operate, the overall sampling, pretreatment and detection take a long time, and the current quantitative detection methods need to predict the chemical components of pollutants and make relevant standard curves, or the detection range is not enough to cover all TVOC components, etc. multifaceted problems

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  • Method for determining total concentration of organic gas in environmental gas by photocatalytic fuel cell (PFC) photoelectrocatalysis method
  • Method for determining total concentration of organic gas in environmental gas by photocatalytic fuel cell (PFC) photoelectrocatalysis method
  • Method for determining total concentration of organic gas in environmental gas by photocatalytic fuel cell (PFC) photoelectrocatalysis method

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preparation example Construction

[0071] 1. Preparation of PFC three-in-one electrode:

[0072] The PFC three-in-one electrode includes three parts: a photoanode 21 , a proton exchange membrane 22 and a cathode 23 , and the proton exchange membrane 22 is located between the photoanode 21 and the cathode 23 . The photoanode 21 can be prepared by preparing a photocatalyst nano-film on the photoanode carrier, and the photoanode carrier can be a sheet-like or mesh-shaped porous and proton-permeable material, such as a perforated titanium plate, a conductive nickel mesh, carbon fiber cloth or Carbon paper and other materials. The cathode 23 is mainly prepared by loading a Pt / C catalyst on a conductive porous material, or directly using an electrode with good and stable conductivity such as a platinum sheet or a nickel mesh. The proton exchange membrane 22 needs to be pretreated to selectively pass protons. Then, the photoanode 21, the proton exchange membrane 22 and the cathode 23 are subjected to hot-pressing tr...

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Abstract

The invention discloses a method for determining the total concentration of organic gas in environmental gas by a photocatalytic fuel cell (PFC) photoelectrocatalysis method. The PFC photoelectrocatalysis method particularly comprises a PFC saturation photocurrent method and a PFC coulometry. The method for determining the total concentration of the organic gas in the environmental gas comprises the following steps of: manufacturing a PFC three-in-one electrode; assembling a PFC determining device; and recording the saturation photocurrent or electric quantity of organic gas of a light anode chamber, and calculating the total concentration of the organic gas in the environmental gas according to the corresponding formula. The total content of the organic gas in the environmental gas is determined by using a PFC device, electric signals of PFC photoelectrocatalysis on oxidizing reaction of the organic gas are recorded by using an electrochemical workstation, and the total content of the organic gas in the gas is calculated according to the theories of the saturation photocurrent method and the coulometry. The technology solves the problems of complex conventional processes of acquisition, desorption, pre-treatment and the like, and a sample can be directly used for determination without pretreatment; and the method is short in determination time, and quick and convenient and avoids secondary pollution and is suitable for environment monitoring and laboratory analysis.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a method for measuring the concentration of total organic gases in ambient gas by using a PFC photocatalytic method. Background technique [0002] At present, the detection of volatile organic gases (VOCs) in ambient gases has to go through three processes: sampling, pretreatment and quantitative analysis. The sampling method of VOCs in ambient gas is mainly to directly collect the measured gas in fixed containers such as syringes and plastic bags, or to collect the measured gas through absorption liquid, adsorbent, cold trap and other methods by using a pump. At the same time, due to the low concentration of VOCs in the gas to be tested, the sample needs to be pretreated before analysis and detection. The analysis methods of VOCs in ambient gas mainly include gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS), and colorimetric tube detection methods. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 李新军习敏刘朝晖吴梁鹏
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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