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An evaluation device and evaluation method for the degradation effect of photocatalytic materials on PM2.5

A technology for photocatalytic materials and evaluation devices, which can be used in measurement devices, analytical materials, instruments, etc., and can solve problems such as large differences in open space states.

Active Publication Date: 2018-03-27
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this evaluation method, ultraviolet light is used to simulate lighting, and natural lighting is not used, which is quite different from the actual open space state of the road surface.

Method used

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  • An evaluation device and evaluation method for the degradation effect of photocatalytic materials on PM2.5
  • An evaluation device and evaluation method for the degradation effect of photocatalytic materials on PM2.5

Examples

Experimental program
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Effect test

Embodiment 1

[0062] An evaluation device for the degradation effect of photocatalytic materials on harmful gases in the atmosphere, such as figure 1 As shown, it includes a gas reaction chamber 12 , a mixed compressed gas generator 2 , and a gas analyzer 1 , and the gas reaction chamber 12 includes a specimen holder 7 . The specimen support 7 is arranged at the bottom of the gas reaction chamber 12 for supporting the specimen 6 .

[0063] In this embodiment, there are four detection holes 4 with a diameter of 20 mm at four heights of 50 mm, 500 mm, 1000 mm and 1500 mm on the centerline of one side of the gas reaction chamber 12 from the experimental specimen 6. The side opposite to the side There are two air pressure adjustment holes 13 with a diameter of 20mm at the heights of 250mm and 750mm from the center line of the experimental specimen; on the top surface of the gas reaction chamber 12, the center line is 200mm away from the two sides. The air hole 5 and the air inlet 5 are used to...

Embodiment 2

[0084] A method for evaluating the degradation effect of photocatalytic materials on PM2.5, the evaluation device used is the same as in Example 1, and the method is basically the same as in Example 1, except that when the third step is implemented, the mixed gas is by NO 2 and air, and get NO in the gas reaction chamber 12 2 The stable value of the initial gas concentration is 84.7μg / m 3 ;NO 2 The stable concentration after gas degradation is 68.4μg / m 3 , to obtain titania-based photocatalytic materials for NO 2 The degradation efficiency of P = 19.24%.

Embodiment 31

[0086] A device for evaluating the degradation effect of photocatalytic materials on harmful gases in the atmosphere is basically the same as in Example 1. The difference is that in this example, the gas reaction chamber 12 also includes an ultraviolet lamp 8, and an ultraviolet lamp 8 is arranged above the ultraviolet lamp 8. The lampshade 9, the ultraviolet lampshade 9 is used to fix the ultraviolet lamp 8, the ultraviolet lampshade 9 is made of colorless transparent organic glass, the ultraviolet lampshade 9 is connected with the top of the gas reaction chamber 12 through the lampshade connecting rod, and the lampshade connecting rod can be stretched up and down , thereby driving the ultraviolet lampshade 9 and the ultraviolet lamp 8 to move up and down, thereby adjusting the distance between the ultraviolet lamp 8 and the test piece 6, for simulating different light intensities, during which, the ultraviolet intensity in the air is detected with a light intensity meter.

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Abstract

The invention provides a device for evaluating the degradation effect of photocatalytic materials on PM2.5, which includes a gas reaction chamber, a mixed compressed gas generating device, and a gas analyzer, wherein the gas reaction chamber is made of colorless and transparent material. The present invention also provides a method for evaluating the degradation effect of photocatalytic materials on harmful gases in the atmosphere using the evaluation device. The first step is to introduce mixed gas into the gas reaction chamber, and before the gas reaches stability, the gas reaction chamber is sealed with an airtight layer. Cover the light mask and control the outlet gas concentration by controlling the flow rate of the flow meter; after reaching the required gas concentration, remove the opaque mask and start monitoring and recording the concentration changes in the gas reaction chamber. During the monitoring process, the gas continues to be introduced and the Monitor and record the light intensity; stop monitoring after the gas in the reaction chamber is stable; calculate the degradation efficiency of photocatalytic materials on harmful gases. This evaluation device can truly simulate the real state of the road surface, and the evaluation results are closer to the real situation.

Description

technical field [0001] The invention belongs to the technical field of road material engineering, and relates to an evaluation technology for the degradation effect of asphalt mixture on harmful gases in PM2.5, in particular to an evaluation device and evaluation method for the degradation effect of photocatalytic materials on PM2.5. Background technique [0002] PM2.5 particles are rich in SO4 2‐ ,, N0 3‐ 、CI ‐ 、Na + 、K + , NH 4 + 、Cu + , Fe + and CO et al. Harmful gas can be transformed into SO twice 4 2‐ ,, N0 3 ‐ and NH 4 + . With the rapid construction and rapid development of the transportation industry, motor vehicles make people's lives more convenient, but vehicle exhaust has become one of the main sources of PM2.5 in the air, which not only destroys the ecological environment, but also threatens health . Motor vehicle exhaust contains a large number of harmful substances, including carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides and solid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
CPCG01N33/00G01N33/0096
Inventor 徐世法许鹰索智柴林林段文志王春明谢永清季节
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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