Electrodes microwave discharging light with 190nm and 207nm quasi-molecule and use thereof

A 207nm, discharge lamp technology, applied in the field of photochemistry, can solve the problems of single spectral line, unavoidable energy utilization rate, short life of electrode discharge UV lamp, etc., and achieve the effect of prolonging life.

Inactive Publication Date: 2005-12-28
FUDAN UNIV
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  • Abstract
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Problems solved by technology

Both the microwave electrodeless discharge and the excimer light source have been proposed and implemented in different fields. The former is mainly to solve the problems of short life and single spectral line of the existing electrode discharge ultraviolet lamp [2], while the latter is based on its infinite The advantage of self-absorption of radiation and was first used in the laser generation system
In recent years, there have also been some attempts to directly or photocatalytically degrade dye wastewater by using microwave electrodeless discharge to excite mercury atoms to generate ultraviolet light with a wavelength of 185nm or longer (such as 253.7nm and 365nm) [3, 4, 5], but they have not fundamentally Above all, it solves the limitations of the wavelength of ultraviolet light existing in the above-mentioned mercury lamp light source, and at the same time, the defect of low energy utilization rate is unavoidable.
We organically combined microwave electrodeless discharge and excimer light source to develop a new type of microwave excimer ultraviolet light source, and applied it to the direct photodegradation of pollutants, which has not been reported at home and abroad

Method used

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  • Electrodes microwave discharging light with 190nm and 207nm quasi-molecule and use thereof
  • Electrodes microwave discharging light with 190nm and 207nm quasi-molecule and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 207nm KrBr * Excimer microwave electrodeless ultraviolet lamp (Kr-Br 2 The total pressure of the mixed gas is 10torr, Kr:Br 2 The air pressure ratio is 50:1, the outer diameter of the lamp tube is 20mm, and the length is 30cm) directly photodegrades high-concentration dye wastewater, and the refractory triphenylmethane dye rhodamine B is selected as the treatment object, the treatment concentration is 20mg / L, and the treatment capacity is 400ml. The microwave power used is 600W, and the decolorization rate is measured after 10 minutes of light > 99%, COD Cr The removal rate reaches 90%.

Embodiment 2

[0040] 190nm KrI * Excimer microwave electrodeless ultraviolet lamp (Kr-I 2 The total pressure of the mixed gas is 2.5torr, Kr:I 2 The air pressure ratio is 50:1, the outer diameter of the lamp tube is 10mm, and the length is 30cm) to directly photodegrade the malodorous carbon disulfide gas, and the microwave power used is 400W. Carbon disulfide gas adopts flow dynamic sampling, the residence time of the gas in the light irradiation area is 1s, and the concentration of carbon disulfide gas is 20mg / m 3 . Test results show that the treatment device can effectively remove carbon disulfide odor pollution, and the removal rate is as high as 90%.

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Abstract

The invention consists of microwave generating source, cable, resonant cavity and electrodeless quartz lamp tube. Kr-I2 or Kr-Br2 mixed gases are separately filled into quartz tube. By using microwave electrode discharge method, the mixed gases are activated to generate excited state KrI or KrBr quasi molecule. Through spontaneous radiative transition to ground state, it generates 190nm or 270 nm extreme ultraviolet.

Description

technical field [0001] The invention belongs to the technical field of photochemistry, and in particular relates to a high-power novel microwave excimer light source generating system. Background technique [0002] The use of ultraviolet light to degrade harmful pollutants has long been applied to the field of environmental protection, and it is also a research hotspot in recent years. Common technologies such as: 185nm ultraviolet light directly degrades odorous gases [1], 253.7nm ultraviolet light sterilization, O 3 / UV and H 2 o 2 / UV combined water purification, TiO 2 / UV photocatalytic degradation of organic pollutants, etc. [0003] Compared with traditional chemical, physical and biological methods, UV photodegradation of pollutants has the following outstanding advantages: ① high removal efficiency; ② small size; ③ low operating costs; ④ simple operation, easy installation and maintenance; ⑤ low manufacturing cost, However, existing UV light applications have the...

Claims

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Application Information

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IPC IPC(8): H01J65/04
Inventor 侯惠奇房豪杰阎栋志顾丁红
Owner FUDAN UNIV
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