CN1713338A - Electrodes microwave discharging light with 190nm and 207nm quasi-molecule and use thereof - Google Patents

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

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Publication number
CN1713338A
CN1713338A CN 200510027965 CN200510027965A CN1713338A CN 1713338 A CN1713338 A CN 1713338A CN 200510027965 CN200510027965 CN 200510027965 CN 200510027965 A CN200510027965 A CN 200510027965A CN 1713338 A CN1713338 A CN 1713338A
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microwave
lamp
excimer
ultraviolet light
electrodeless
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CN100373527C (en
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侯惠奇
房豪杰
阎栋志
顾丁红
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Fudan University
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Fudan University
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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

190nm and 207nm excimer microwave electrodeless discharge lamp and application thereof
Technical Field
The invention belongs to the technical field of photochemistry, and particularly relates to a high-power novel microwave excimer light source generating system.
Background
The ultraviolet light is used for degrading harmful pollutants in the environmental protection field for a long time, and is a hotspot of research in recent years, and common technologies such as: 185nm ultraviolet light for directly degrading malodorous gas [1]]253.7nm UV light sterilization and disinfection, O3UV and H2O2UV combined water purification, TiO2UV photocatalytic degradation of organic pollutants and the like.
Compared with the traditional chemical, physical and biological methods, the ultraviolet light degradation pollutant has the outstanding advantages that ① removal efficiency is high, ② volume is small, ③ operation cost is low, ④ operation is simple, installation and maintenance are convenient, ⑤ manufacturing cost is low, however, the existing ultraviolet light application has natural defects, ultraviolet light with four wavelengths of 185nm/253.7nm/313nm/365nm is mainly generated by mercury vapor discharge excited by an electric field between electrodes at two ends of an ultraviolet lamp tube, the defects are represented in two aspects, on one hand, the service life of the ultraviolet lamps is not long, continuous operation generally cannot exceed 1000h, if the abandoned lamp tube is not properly treated, the problem of mercury pollution is caused, on the other hand, practical application of the ultraviolet light with the four wavelengths generated by exciting mercury atoms has many extremely strong limitations, for 185nm ultraviolet light, as quartz materials used for the lamp tube have strong absorption of ultraviolet light with the wavelength of less than 190nm, the 185nm ultraviolet light content of the pollutants which can be effectively removed in the emission spectral line of common low-pressure mercury lamps is lower than 5%, generally not higher than 10%, direct energy, and as a result, the ultraviolet light absorption spectrum has the ultraviolet light absorption rate is only limited by ultraviolet light absorption technology for the ultraviolet light absorption of the ultraviolet light, and the ultraviolet light absorption spectrum line, and the ultraviolet light absorption technology is only used for the ultraviolet light absorption technology for the ultraviolet light degradation pollutant of the ultraviolet light with the ultraviolet light absorption of the ultraviolet light absorption spectrum line is limited by the ultraviolet light absorption technology, and only used for the ultraviolet light absorption technology, and the ultraviolet light absorption technology is limited by the ultraviolet light absorption technology, and only used for the ultraviolet light absorption technology of the ultraviolet light absorption.
The microwave electrodeless (no electrode in ultraviolet lamp tube) discharge excitation KrI provided by the invention*Or KrBr*The technology of excimer gas generating 190nm or 207nm ultraviolet light can well solve the contradiction. Microwave electrodeless discharge and excimer light sources have been proposed and implemented in different fields, the former mainly solving the problems of short life and single spectral line of the existing ultraviolet lamp using electrode discharge [2]]The latter, which was first used in laser generation systems based on its advantage of radiationless self-absorption. In recent years, there have been some attempts to directly or photocatalytically degrade dye wastewater by exciting mercury atoms by microwave electrodeless discharge to generate ultraviolet light (e.g., 253.7nm and 365nm) with 185nm or longer wavelength [3, 4, 5]However, the limitation problem of the ultraviolet wavelength of the mercury lamp light source is not solved fundamentally, and the defect of low energy utilization rate is inevitable.Microwave electrodeless discharge and an excimer light source are organically combined to develop a novel microwave excimer ultraviolet light source, and the novel microwave excimer ultraviolet light source is applied to direct photodegradation of pollutants, which is not reported at home and abroad.
Disclosure of Invention
The invention aims to provide an excimer microwave electrodeless discharge lamp with high energy utilization rate and long service life and application thereof.
The excimer microwave electrodeless discharge lamp provided by the invention is an excimer microwave electrodeless ultraviolet lamp with the wavelength of 190nm or 207nm, and the specific schematic diagram is shown in figure 1. It comprises a microwave generating source 1, a resonant cavity 2, a cable 3 and a dielectric filled with Kr-I2Or Kr-Br2An electrodeless quartz lamp tube for mixing gas; wherein, the control panel of the microwave generating source 1 chassis is provided with an automatic or manual adjusting button for adjusting the microwave output power. The power range of the microwave source is continuously adjustable within 0-1000W; the 2.45GHz microwave emitted from the microwave generating source 1 is transmitted to the cable 3In the resonant cavity 2; one end of an electrodeless quartz lamp tube 4 is inserted into the resonant cavity 2, and a luminescent material in the lamp absorbs microwave energy to generatedischarge and emit ultraviolet light. Although only the lower part of the lamp tube is positioned in the resonant cavity, the whole lamp tube can be smoothly and completely lightened, and the light emission is uniform and stable.
Kr-I2Or Kr-Br2The filling proportion and the air pressure of the mixed gas do not influence the wavelength value of the radiation ultraviolet light, but the output intensity of the ultraviolet light of 190nm or 207nm can be changed by controlling the gas mixing ratio and the total pressure of the mixed gas in a certain proportion and reasonably selecting the microwave power. KrI*And KrBr*The optimum parameter ranges for the excimer light source are substantially the same as shown in table 1.
TABLE 1KrI*And KrBr*Optimum parameter range of excimer light source
190nm KrI*Excimer light source 207nm KrBr*Excimer light source
Kr-I2Total pressure intensity Kr∶I2 (air pressure ratio) Microwave power Kr-Br2Total pressure intensity Kr∶Br2 (air pressure ratio) Microwave power
2～10torr 20∶1--50∶1 100～1000W 2～10torr 20∶1--50∶1 100～1000W
Remarks for note Within the range of 100-1000W microwave power, the output intensity of 190nm (or 207nm) ultraviolet light is increased along with the increase of microwave power
The working principle of the invention is as follows:
with 207nm KrBr*An excimer light source is exemplified. Microwave electrodeless discharge for producing KrBr*The process of excimer 207nm UV irradiation is as follows:
(1) kr and Br2Excitation of (2): first, under the action of microwave electromagnetic field, Kr and Br2Is excited.
(2)KrBr*Excimer formation: excited state of Kr*And Br2 *Ion collision to form KrBr*An excimer molecule, can alsoFormation of KrBr by Harpooning reaction*The excimer, as shown in the following equation, is excited by Kr in the excited state*Transfer its energy to Br2Excited state of KrBr formed by molecules*An excimer.
(3) The radiation process comprises the following steps: KrBr thus formed*The excimer molecules are very unstable and will decompose, usually within a few nanoseconds, releasing excitation energy in the form of ultraviolet photons.
(207nm)
(4) Quenching process: the irradiation process is accompanied by a quenching process, and at lower gas pressures, Br is predominant2Quenching of the excimer by the particle.
At higher gas pressures, the Kr atom initiates a three-body collision reaction that quenches the excimer to form a three-atom particle.
(5)KrBr*Ultraviolet spectrum of excimer light source: measurement of KrBr by vacuum ultraviolet monochromator*The uv emission of the excimer light source results in a spectral profile as shown in figure 2. From FIG. 2 KrBr*The peak wavelength of the excimer molecules is mainly at 207nm, and weak radiation is also present at 222nm and 228 nm. Radiation at 207nm is from B1/2→X1/2The full half width of the transition is about 1 to 20nm depending on the gas pressure.
190nm KrI*Working principle of excimer light source and 207nm KrBr*The excimer light source is similar.
Advantages and applications of the novel light source
KrI compared with the existing mercury lamp light source*Or KrBr*The technology of generating 190nm or 207nm ultraviolet light by excimer gas has wider application space in the field of environmental protection. The excimer light source with the two wavelengths is selected, and the advantages are as follows:
(1) the problems of low transmittance to a quartz tube and short irradiation optical path in water in 185nm ultraviolet light are solved, the light source can be applied to treatment of waste water and waste gas, and the energy utilization rate is high and can reach 50 percent at most.
(2) The light source does not contain mercury and is pollution-free, electrodeless discharge is adopted, the service life of the light source is obviously prolonged, the light source is generally not damaged after continuously running for 2-5 years, and the light source is an ultra-green and economic ultraviolet light source.
(3) Because excimer light radiation does not have self absorption, ultraviolet spectrum with the emission waveband of 1-20 nm width can be generated generally, the ultraviolet spectrum can be absorbed by most pollutants, the photon energy is also higher, the photon energy of ultraviolet light with the wavelength of 190nm and the photon energyof ultraviolet light with the wavelength of 207nm are respectively 6.54eV and 6.0eV, most chemical bonds can be broken, and the purpose of thoroughly oxidizing and degrading the pollutants can be achieved under the participation of oxygen. Therefore, high-concentration pigment wastewater and the like can be directly degraded, and H can be removed2S、CS2And malodorous substances such as styrene.
The light source can be widely applied to the field of environmental protection by the advantages. It can be used to remove various organic pollutants difficult to degrade, including high concentration and deep degradation, water pollution purification and waste gas treatment, especially the treatment of malodorous pollutants which are concerned in recent years.
Drawings
Fig. 1 is a schematic diagram of the structure of an excimer microwave electrodeless discharge lamp.
FIG. 2 shows KrBr*Radiation spectrum of excimer microwave electrodeless discharge lamp.
Reference numbers in the figures: 1 is a micro generating source, 2 is a resonant cavity, 3 is a cable, and 4 is an electrodeless quartz lamp tube.
Detailed Description
The invention is further described by the following embodiments, and the invention comprises ① microwave generating power supply, the microwave frequency is 2.45GHz, the microwave power is continuously adjustable within the range of 0-1000W, the size of the microwave power supply case is 18cm multiplied by 25cm multiplied by 40 cm:
② resonant cavity, which is cylindrical, has an outer diameter of 12cm and a height of 6 cm;
③ cable, external diameter 10mm, length as the case may be;
④ electrodeless quartz tube filled with Kr-I2(or Kr-Br)2) The gas is mixed with the mixture of the air and the water,
the lamp tube is in a circular tube shape, the outer diameter is 10 mm-20 mm, and the length is determined according to specific conditions. The lamp tube can also be made into a flat plate shape.
Example 1:
207nm KrBr*excimer microwave electrodeless ultraviolet lamp (Kr-Br)2The total pressure of the mixed gas is 10torr, Kr: Br2The air pressure ratio is 50: 1, the outer diameter of the lamp tube is 20mm, the length is 30cm) directly photodegradation high-concentration dye wastewater, a nondegradable triphenylmethane dye rhodamine B is selected as a treatment object, the treatment concentration is 20mg/L, and the treatment capacity is 400 ml. The microwave power is 600W, the decolorization rate is more than 99 percent after 10min illumination, and the COD is determinedCrThe removal rate reaches 90 percent.
Example 2:
190nm KrI*excimer microwave electrodeless ultraviolet lamp (Kr-I)2The total pressure of the mixed gas is 2.5torr, Kr: I2The air pressure ratio is 50: 1, the outer diameter of the lamp tube is 10mm, the length is 30cm) directly degrades carbon disulfide malodorous gas by light, and the microwave power is 400W. Introducing carbon disulfide gas in a flowing state, wherein the retention time of the gas in a light irradiation region is 1s, and the gas inlet concentration of the carbon disulfide is 20mg/m3. Test results show that the treatment device can effectively remove carbon disulfide odor pollution, and the removal rate is up to 90%.
Reference documents:
1. house Haoyejie, Wu Qi Fang, Zhu Cheng and Hou Qi. Low concentration of CS2The light degradation research and the process design of the waste gas. Environmental pollution abatement technologies and equipment have been accepted.
2. Plum fruitAnd (6) translation. An electrodeless lamp and applications thereof. Chinese lighting appliances, 1998, 5: 25-28.
3.Jaromír Literfák，Petr Kirán。The electrodeless discharge lamp：a prospective tool forphotochemistry Part 2.Scope and limitation。Journal of Photochemistry and Photobiology A：Chemistry，2000，137：29～35。
4.Shiro Iwaguch，Kentaro Matsumura，Yoshikazu Tokuoka，et al.。Sterilization system usingmivrowave and UV light。Colloids and Surfaces B：Biointerfaces，2002，25：299～304。
5.Satoshi Horikoshi，Hisao Hidaka。Environmental remediation by an integratedmicrowave/UV illumination technique。3.A microwave-powered plasma light source andphotoreactor to degrade pollutants in aqueous dispersions of TiO2 illuminated by the emittedUV/Visable radiation。Environ.Sci.Technol.，2002，36：5229～5237。

Claims (4)

1. A190, 207nm quasi-molecule microwave electrodeless discharge lamp is characterized in that the lamp is a microwave ultraviolet lamp with the wavelength of 190nm or 207nm, and comprises a microwave generating source (1), a resonant cavity (2), a cable (3) and a lamp filled with Kr-I2Or Kr-Br2An electrodeless quartz lamp tube (4) for mixing gas; wherein, the control panel of the case of the microwave generating source (1) is provided with an automatic or manual adjusting buttonfor adjusting the microwave output power, and the microwave output power range is 0-1000W; 2.45GHz microwaves emitted from the microwave generating source (1) are transmitted into the resonant cavity (2) by the cable (3); one end of the electrodeless quartz lamp tube (4) is inserted into the resonant cavity (2).
2. A discharge lamp as claimed in claim 1, characterized in that the electrodeless quartz lamp vessel is of a round tube shape or a flat plate shape.
3. Discharge lamp according to claim 1, characterized in that Kr-I2Or Kr-Br2The total pressure of the mixed gas is 2-10porr, Kr: I2Or the gas pressure ratio of Kr to Br is 20: 1-50: 1.
4. Use of a discharge lamp as claimed in any one of claims 1 to 3 for degrading organic pollutants.
CNB2005100279650A 2005-07-21 2005-07-21 Electrodes microwave discharging light with 190nm and 207nm quasi-molecule and use thereof Expired - Fee Related CN100373527C (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101388320B (en) * 2008-10-24 2010-04-21 王颂 Electrodeless quasi-molecule lamp
CN101857283A (en) * 2010-06-18 2010-10-13 江苏技术师范学院 Device for treating waste water with microwave electrodeless excimer lamp and gas distributing system for lamp
CN101969014A (en) * 2010-09-25 2011-02-09 清华大学 Ultraviolet radiation characteristics test method and device of electrodeless lamp
CN102664135A (en) * 2012-05-25 2012-09-12 复旦大学 High-intensity inductively coupled ultraviolet source
CN103227098A (en) * 2013-05-15 2013-07-31 王颂 282nm/222nm electrodeless excimer lamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000021589A (en) * 1998-06-30 2000-01-21 Toshiba Lighting & Technology Corp Electrodeless discharge lamp lighting device and photochemical processing device
ES2387614T3 (en) * 1999-07-29 2012-09-27 Severn Trent Water Purification, Inc. UV light source
CN1549300A (en) * 2003-05-19 2004-11-24 电子科技大学 Microwave ultra violet light source

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101388320B (en) * 2008-10-24 2010-04-21 王颂 Electrodeless quasi-molecule lamp
CN101857283A (en) * 2010-06-18 2010-10-13 江苏技术师范学院 Device for treating waste water with microwave electrodeless excimer lamp and gas distributing system for lamp
CN101969014A (en) * 2010-09-25 2011-02-09 清华大学 Ultraviolet radiation characteristics test method and device of electrodeless lamp
CN101969014B (en) * 2010-09-25 2012-11-14 清华大学 Ultraviolet radiation characteristics test method and device of electrodeless lamp
CN102664135A (en) * 2012-05-25 2012-09-12 复旦大学 High-intensity inductively coupled ultraviolet source
CN103227098A (en) * 2013-05-15 2013-07-31 王颂 282nm/222nm electrodeless excimer lamp

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