Concentration detection device and concentration detection method for gas-phase organic matter based on light-catalyzed reaction

A photocatalytic reaction and concentration detection technology, applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of complex equipment, unsuitable for real-time detection, high price, etc., and achieve fast response speed, manufacturing and detection. Low cost, high sensitivity effect

Inactive Publication Date: 2013-12-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no method and equipment specifically for the detection of gas-phase organic concentration. Most of them use electronic dogs or gas chromatography for qualitative and quantitative analysis of gas-phase components. These methods are complex and expensive, and are not suitable for use in refrigerators, cars and household environments. real-time detection

Method used

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  • Concentration detection device and concentration detection method for gas-phase organic matter based on light-catalyzed reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] ①. Nano-TiO based on conductive metal matrix 3 2 Preparation of Membrane 2

[0052] Prepared by anodic oxidation method, the conductive metal matrix 3 is Ti and nano-TiO 2 Membrane 2 is TiO 2 Nanotube array film, using high-purity Ti sheet as anode, graphite as cathode, electrolyte solution is ethylene glycol solution containing 0.3mol / L HF, anode voltage is 100V, anodization time is 10h; after anodization, TiO 2 / Ti nanotube array film was shaken in ultrasonic wave for 1min to remove broken nanotubes on the surface, washed in high-purity water for 5min, kept in a constant temperature box at 40°C for 5h and dried, anodized TiO 2 The nanotube array is crystallized by heat treatment in a muffle furnace at a temperature of 500° C. for 2 hours.

[0053] ②, UV light source 1 chooses LED UV light source, and the optical power is 120mW / cm 2 , the wavelength is 300nm.

[0054] ③. Detection of gas phase organic matter concentration

[0055] according to figure 1 Install ...

Embodiment 2

[0057] Nano-TiO based on conductive metal matrix 3 2 The preparation of film 2 and the selection of the ultraviolet light source are the same as those in Example 1, except that the concentration of gas-phase organic matter is measured by an amperometric method.

Embodiment 3

[0059] ①. Nano-TiO based on conductive metal matrix 3 2 Preparation of Membrane 2

[0060] Prepared by hydrothermal method, the conductive metal matrix 3 is Ti and nano-TiO 2 Membrane 2 is nano TiO 2 For the tube membrane, take 10mL of 10mol / L NaOH aqueous solution and place it in a polytetrafluoroethylene-lined reaction kettle, and place a Ti piece in it, heat the sealed reaction kettle to 180°C, keep it warm for 10h, cool it completely, and wash it in high-purity water 5min; TiO 2 The / Ti nanotube membrane was soaked in 10 mL of hydrochloric acid with a concentration of 1 mol / L for 30 minutes to acidify, washed in high-purity water for 5 minutes, dried and then crystallized by heat treatment in a muffle furnace at a temperature of 500 °C for 2 hours.

[0061] ②, UV light source 1 selects xenon lamp light source, and the optical power is 1000mW / cm 2 , the wavelength is 200nm.

[0062]③. Detection of gas phase organic matter concentration

[0063] according to figure 1 ...

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Abstract

The invention relates to the technical fields of nanometer materials, photocatalytic materials, environment analysis and sensing, and particularly relates to a concentration detection device and a concentration detection method for a gas-phase organic matter based on light-catalyzed reaction. The detection device comprises an ultraviolet light source, a nano TiO2 film based on a conductive metal substrate, and a signal collection system, wherein the nano TiO2 film is arranged on a light path of the ultraviolet light source and used for loading a gas-phase organic matter to be detected; the signal collection system is used for collecting potential or current change data between the nano TiO2 film and the conducive metal substrate in the process of photocatalytic degradation of the gas-phase organic matter to be detected, so as to detect the concentration of the gas-phase organic matter to be detected. The concentration detection device can rapidly detect aiming at gas-phase organic pollutants in refrigerators, automobiles and home environments, and is high in sensitivity and high in response speed. A signal is from electric signal change generated in the process of photocatalytic oxidation of the organic matter by the nano TiO2 film, so that no chemical reagent is needed; the detection device is friendly to environment, simple in structure, and the sensor is low in manufacturing and detection costs.

Description

technical field [0001] The invention relates to the technical fields of nanomaterials, photocatalytic materials, environmental analysis and sensing, in particular to a gas-phase organic substance concentration detection device and detection method based on photocatalytic reactions. Background technique [0002] Organic pollution has become one of the important sources of pollution in modern society, which includes both water organic pollution and gas phase organic pollution. Water body organic matter pollution includes a large amount of organic pollutants in the wastewater discharged from various pesticide factories, chemical fertilizer plants and other chemical plants, and gas phase organic matter pollution includes odors from rotting fruits, vegetables and meat in refrigerators, formaldehyde pollution from cars and home decorations As well as the organic pollutants generated by the waste discharge of many chemical enterprises. [0003] Water organic pollutants have detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 徐光青吕珺刘家琴吴玉程
Owner HEFEI UNIV OF TECH
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