CN103084062B - Device for purifying air and keeping freshness - Google Patents
Device for purifying air and keeping freshness Download PDFInfo
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- CN103084062B CN103084062B CN201310032482.4A CN201310032482A CN103084062B CN 103084062 B CN103084062 B CN 103084062B CN 201310032482 A CN201310032482 A CN 201310032482A CN 103084062 B CN103084062 B CN 103084062B
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Abstract
The invention discloses a device for purifying air and keeping freshness. The device for purifying air and keeping freshness comprises an air blower device, a light source, a photocatalytic degradation device and an outer shell, wherein the air blower device, the light source and the photocatalytic degradation device are all fixed on the outer shell; the photocatalytic degradation deivce is arranged on one side of the light source; the air blower device is arranged at the other side of the light source; and through holes are formed in the outer shell. The device improves the photocatalytic efficiency, and especially takes an LED (light emitting diode) light source as a light irradiation condition, so the photocatalytic efficiency is improved by 8-10 times in industrial and commercial circles, and is improved by 16-20 times compared with the efficiency of adsorbing formaldehyde by carbon; and the device can kill floras on surfaces of objects in enclosed spaces, stores food at normal temperature, and also is energy-saving and environment-friendly, and is safe and practical.
Description
Technical field
The present invention relates to one to purify air and preservation device, particularly a kind ofly can remove harmful substance in air and food preservation unit thereof.
Background technology
TiO
2as a kind of important semi-conducting material, and it absorbing wavelength can only be less than the ultraviolet light of 387nm, and photocatalysis efficiency is very low in the sunlight.By obtained three-dimensional grapheme material by hydro-thermal method and TiO
2after compound, can fast transfer TiO
2through the photo-generated carrier that illumination produces.
Nano-TiO
2there is the specific physical not available for traditional material, chemical characteristic, its chemical stability is high, nontoxic pollution-free, has that particle size is little, specific area is large, surface energy high, and its distinctive three large effect: skin effect, small-size effect and macro quanta tunnel effect.
Three-dimensional grapheme material, structurally be different from the Graphene of two dimension, two-dimensional graphene is easily reunited, difficult dispersion, be difficult to the material obtaining high-specific surface area, it has three-dimensional hollow porous network structure, net wall is Graphene, for the graphite of layer structure and the graphitic carbon foam of porous, the advantage such as there is extremely-low density surface area, high heat conduction, high temperature resistant, corrosion-resistant, ductility, pliability are good, single-layer and transparent and quality is higher.
People more and more pay attention to air quality indexes and food security, in order to remove the harmful organic substances such as formaldehyde in air and extend the food fresh keeping phase, there is people's proposition carbon adsorption formaldehyde, improved air quality, extend the food fresh keeping phase by the method for packing technique and refrigeration.Because it is many that the design feature of active carbon is hole, have very strong absorption affinity, this feature that a lot of box respirator make use of active carbon is made.Preferably select the active carbon that particle is smaller, the less adsorption effect of particle is better.But charcoal absorption formaldehyde, can only adsorb, and can not decompose, and formaldehyde is still present in air, it can not be allowed thoroughly to disappear, and the time of the sustainable use of active carbon is very short.
In addition, in food, the common practice of fruit freshness preserving is made an effort on the packaging, uses vacuum bag packages.Although certain fresh-keeping effect can be played by vacuum bag packages, this fresh-keeping be and oxygen-barrier to play real bactericidal action substantially, some fruit are fresh-keeping in vacuum bag, can not eupnea, finally also can cause spoiled.And use vacuum bag expensive, cost is high.And the defect of Refrigeration Technique is food easy breed bacteria in the process of thawing, the protein of food surface can be destroyed, and nutritive value and fresh taste are all had a greatly reduced quality.
The technical solution adopted in the present invention, can become harmless CO by harmful substances such as formaldehyde, benzene,toluene,xylene, ammonia, ethene, TVOC with the oxidation Decomposition such as bacterium, virus
2and H
2o, thus play and to purify air and fresh-keeping effect.
Summary of the invention
The object of this invention is to provide a kind of device applying the material of high photocatalysis efficiency, this device can realize food at normal temperatures to carry out fresh-keepingly depositing and remove indoor harmful formaldehyde.
The invention provides one to purify air and preservation device, comprise air-blast device, light source, photocatalytic degradation device and shell, described air-blast device, light source, photocatalytic degradation device are all fixed with described shell, the side of described light source arranges photocatalytic degradation device, opposite side arranges air-blast device, and described shell has through hole.
Purify air described and in preservation device, damping device is set.
Purify air described and in preservation device, heater is set.
In described photocatalytic degradation device, pass into DC current, described electric current is 0.5A-1A.
Described light source is ultraviolet light, and the one in preferred mercury lamp or LED light source, wherein, the wavelength of described LED light source is 375 ~ 385 nanometers.
Described air-blast device is low-voltage electric fan, act as actuating air circulation.
The material of described shell is light-proof material.
Described photocatalytic degradation device comprises basalis nickel screen or copper mesh, outer TiO
2nanosphere thin layer and the intermediate layer individual layer three-dimensional grapheme layer between basalis and skin.
The aperture of described basalis is 0.01-0.6mm, the preferred 0.01-0.1 mm in aperture.
TiO in described skin
2the diameter of nanosphere is 5-100 nm.
Described photocatalytic degradation device is prepared by following steps:
1) at protection gas and hydrogen, under 800 ~ 1300 DEG C of conditions, pass into carbon-source gas again after removing substrate surface oxide skin(coating), close carbon source after 2-10 minute, sample is cooled to room temperature rapidly, protection gas and hydrogen is closed;
2), under ice bath, by slow for butyl titanate agitation and dropping in ethanol, drop rate controls at 1-2ml/min, ultrasonic mix after, then the sample of the first step is put into reactant liquor, hydro-thermal reaction at 160-220 DEG C;
3) pass into protection gas, be heated to 400 ~ 600 DEG C of reactions after the sample clean be obtained by reacting by second step, drying, obtain basalis/three-dimensional grapheme/TiO
2nanosphere film.
The removal time described in step 1 is 5-20 minute, described carbon-source gas be selected from methane, methyl alcohol, ethanol or ethane one or more; Described protection gas is selected from argon gas or neon; Described carbon-source gas be methane or ethane time carbon-source gas flow velocity be 1-10 s.c.c.m., preferred 3-7 s.c.c.m.; Described carbon-source gas be methyl alcohol or ethanol time, use 1-10 s.c.c.m., the protection gas bell of preferred 3-7 s.c.c.m.; The flow velocity of described hydrogen is 100-300 s.c.c.m., preferred 150-250 s.c.c.m.; Described shielding gas flow speed is 300-600 s.c.c.m.; Described cooldown rate is 200-300 DEG C/min.
Butyl titanate described in step 2 accounts for the 15-25% of ethanol quality; Described ethanol temperature controls at 0-5 DEG C, and the described reaction time is 4-24h.
Baking temperature described in step 3 is 50-80 DEG C, and described drying condition is under vacuum, and described drying time is 3-4h; Described heating-up temperature preferably 400 DEG C, the described reaction time is 0.5-3 hour.
Compared with prior art, its remarkable advantage is in the present invention:
1) improve photocatalysis efficiency, particularly LED light source is as illumination condition, and therefore photocatalysis efficiency improves 8 ~ 10 times at industrial and commercial circles, improves 16 ~ 20 times than traditional by the efficiency of carbon adsorption formaldehyde;
2) existing method of directly ultraviolet light source direct irradiation being carried out sterilization at foodstuff surface, can only kill the flora in the light source direct irradiation faces such as uviol lamp, and device of the present invention can kill the flora of body surface in confined space;
3) achieve normal temperature and preserve food, and energy-conserving and environment-protective, safe and practical;
4) the fresh-keeping instrument using this material to make can effectively sterilization, removes the organic matters such as formaldehyde, ensures air quality, can also sterilizing, extends the food fresh keeping phase;
5) in the preparation of titanium dioxide nano-sphere; control drop rate and dropping temperature; titanium dioxide can be made to generate the chondritic that size is even, specific area is large; and be uniformly distributed in individual layer three-dimensional grapheme surface; good dispersion; both the reunion of self particle had been avoided; also effectively prevent the heavily accumulation of graphene sheet layer; structure specific to nano composite material makes it have good heat endurance and excellent photocatalytic activity, has potential using value in fields such as environmental protection, functional composite material and photocatalysis.
Accompanying drawing explanation
Fig. 1 is the structural representation of device of the present invention.
Fig. 2 is the structural representation of photocatalytic degradation device 3 of the present invention.
Fig. 3 is embodiments of the invention 1 and comparative example formaldehyde degradation by photocatalytic oxidation process design sketch.
Fig. 4 is the formaldehyde degradation by photocatalytic oxidation process design sketch (a changes light source, and b changes temperature, and c adds electric current, and d adds humidity) under embodiments of the invention 1 different condition.
Detailed description of the invention
Below in conjunction with accompanying drawing, describe embodiments of the present invention in detail.
Principle of the present invention is: nano-TiO
2mechanism of Semiconductor Photocatalytic Degradation is divided into 8 steps to complete light-catalysed process:
When a photon with hv energy size or have the photon being greater than semiconductor energy gap Eg inject semiconductor time, an electronics is energized into conduction band (CB) by valence band (VB), thus on conduction band, a high activity electronics (e-) is produced, valence band leaves a hole (h+), forms redox system.Dissolved oxygen and power and water and hole interaction, final produce highly active hydroxyl.OH-, O
2-, OOH-free radical has strong oxidizing property, great majority can be adsorbed on TiO
2the organic pollutant degradation on surface is CO
2, H
2o, is oxidized inorganic pollution or is reduced to harmless object.
As Fig. 1, of the present invention purify air and preservation device by air-blast device 1, light source 2, photocatalytic degradation device 3, damping device 4 and shell composition, described air-blast device 1, light source 2, photocatalytic degradation device 3 is all fixed with shell, the side of light source 2 arranges photocatalytic degradation device 3, opposite side arranges air-blast device 1, the light radiation that light source 2 sends is on photocatalytic degradation device 3, shell has several through hole, in order to keep the moisture of food, damping device 4 is set in the enclosure, humid control is advisable at 15%-40%, in order to improve photocatalysis efficiency, also be provided with heater in the enclosure, heater can adopt potsherd, heating and temperature control is below 60 DEG C.Light source 2 adopts mercury lamp or wavelength to be one in the LED light source of 375 ~ 385 nanometers.Air-blast device 1 is low-voltage electric fan, act as actuating air circulation, and the material of shell adopts light-proof material.
Photocatalytic degradation device 3 is by basalis 7 nickel screen or copper mesh, outer 5TiO
2nanosphere thin layer and the intermediate layer 6 individual layer three-dimensional grapheme layer composition between basalis 7 and outer 5.
In order to improve photocatalysis effect, also can pass into DC current on photocatalytic degradation device 3, Current Control is at about 0.5A.
When food with to purify air and preservation device puts into closed container, light source 2 and air-blast device 1 are opened in energising, make light source 2 prolonged exposure on photocatalytic degradation device 3 surface, are circulated by air in air-blast device 1 pair of closed container.
Photocatalytic degradation device 3 of the present invention is prepared by following examples.
Embodiment 1
Nickel screen (aperture 0.01mm) is placed in horizontal pipe furnace, under passing into argon gas (flow velocity 500 s.c.c.m) and hydrogen (200 s.c.c.m.), 1000 DEG C of conditions, heat 10 minutes, after removing oxide layer, then pass into methane gas (5 s.c.c.m.), after 5 minutes, close methane gas, keep the flow velocity of argon gas and hydrogen constant, sample is quickly cooled to room temperature with the speed of 200 DEG C/min, close argon gas and hydrogen, obtained individual layer three-dimensional grapheme.Under ice bath, by butyl titanate 5g with the slow agitation and dropping of the drop rate of 1ml/min in 20g ethanol, ethanol temperature controls at 0 DEG C, ultrasonic mix after, again obtained individual layer three-dimensional grapheme is put into reactant liquor, at 160 DEG C, be placed in hydrothermal reaction kettle carry out hydro-thermal reaction 4h.Pass into nitrogen, the sample clean that hydro-thermal reaction is obtained, be heated to after dry 3h at 50 DEG C 500 DEG C reaction 1h, obtain basalis/three-dimensional grapheme/TiO
2nanosphere film and photocatalytic degradation device 3.
Embodiment 2
Nickel screen (aperture 0.01mm) is placed in horizontal pipe furnace, under passing into argon gas (flow velocity 600 s.c.c.m) and hydrogen (250 s.c.c.m.), 900 DEG C of conditions, heat 20 minutes, after removing oxide layer, then pass into methane gas (10 s.c.c.m.), after 5 minutes, close methane gas, keep the flow velocity of argon gas and hydrogen constant, sample is quickly cooled to room temperature with the speed of 250 DEG C/min, close argon gas and hydrogen.Under ice bath, by butyl titanate 5g with the slow agitation and dropping of the drop rate of 1.5ml/min in 25g ethanol, ethanol temperature controls at 5 DEG C, ultrasonic mix after, again obtained individual layer three-dimensional grapheme is put into reactant liquor, at 220 DEG C, be placed in hydrothermal reaction kettle carry out hydro-thermal reaction 24h.Pass into nitrogen, the sample clean that hydro-thermal reaction is obtained, be heated to after dry 4h at 80 DEG C 600 DEG C reaction 0.5h, obtain basalis/three-dimensional grapheme/TiO
2nanosphere film and photocatalytic degradation device 3.
Embodiment 3
Nickel screen (aperture 0.1mm) is placed in horizontal pipe furnace, under passing into neon (flow velocity 300 s.c.c.m) and hydrogen (100 s.c.c.m.), 800 DEG C of conditions, heat 10 minutes, after removing oxide layer, then pass into ethane gas (1 s.c.c.m.), after 10 minutes, close ethane gas, keep the flow velocity of neon and hydrogen constant, sample is quickly cooled to room temperature with the speed of 200 DEG C/min, close neon and hydrogen.Under ice bath, by butyl titanate 6g with the slow agitation and dropping of the drop rate of 2ml/min in 40g ethanol, ethanol temperature controls at 3 DEG C, ultrasonic mix after, again obtained individual layer three-dimensional grapheme is put into reactant liquor, at 180 DEG C, be placed in hydrothermal reaction kettle carry out hydro-thermal reaction 16h.Pass into nitrogen, the sample clean that hydro-thermal reaction is obtained, be heated to after dry 4h at 60 DEG C 400 DEG C reaction 3h, obtain basalis/three-dimensional grapheme/TiO
2nanosphere film and photocatalytic degradation device 3.
Comparative example
Under ice bath, by butyl titanate 5g with the slow agitation and dropping of the drop rate of 1ml/min in 20g ethanol, ethanol temperature controls at 0 DEG C, ultrasonic mix after, then nickel screen is put into reactant liquor, at 160 DEG C, is placed in hydrothermal reaction kettle carries out hydro-thermal reaction 4h.Pass into nitrogen, the sample clean that hydro-thermal reaction is obtained, be heated to after dry 3h at 50 DEG C 500 DEG C reaction 1h, obtain nickel screen/TiO
2nanosphere film.
(1) aldehyde test
1.1 change photocatalytic degradation device structures, comparative example are obtained material and the obtained material of embodiment 1 as photocatalytic degradation device of the present invention, carry out aldehyde test, inject the liquid formaldehyde of about 30ul, open fan, allow it fully volatilize, adopt CO and the CO of calibration
2the concentration data that sensor Measurement accuracy is real-time, opens uviol lamp (mercury lamp), allows UV-irradiation photocatalytic degradation device.Every 10 minutes record one secondary data, as shown in Figure 3, result was known for its result of the test, and the material that embodiment 1 obtains does not contain the effective of single-layer graphene as photocatalytic degradation device than in comparative example.
1.2 change light sources 2, and other experiment condition is with 1.1, and as shown in fig. 4 a, result is known for its result of the test, and LED is as effective than mercury lamp degradation of formaldehyde of light source, and the LED light source of 385nm wavelength is more effective than 375nm.
1.3 change temperature, make it to control at 50-60 DEG C, and other experiment condition is with 1.1, and as shown in Figure 4 b, result is known for its result of the test, add the effective of ratio of specific heat not Heating degrades formaldehyde.
1.4 pass into DC current 0.5A at photocatalytic degradation device, and other experiment condition is with 1.1, and as illustrated in fig. 4 c, result is known for its result of the test, pass into effective than obstructed electric current degradation of formaldehyde of electric current.
1.5 change humidity, make it to control 30%, and other experiment condition is with 1.1, and as shown in figure 4d, result is known for its result of the test, increase humidity ratio and do not add the effective of humidity degradation of formaldehyde.
(2) degerming and fresh-keeping test
Winter, room temperature about 15 degree, two nonocclusive aseptic a, b and the external world maintain the circulation of air (allowing the bacterium in air enter aseptic), equal culture dish holding in aseptic a, b, adds MS culture medium and agar powder in culture dish, then by shown in Fig. 1 purify air and preservation device is placed in one an aseptic a, after irradiating 12h, 18h, 24h respectively, cultivation three days under 24 degree, observe in the culture dish of aseptic a, b and occur with or without bacterium colony, its experimental result is as following table:
The degerming experimental result of table 1
| Experiment condition | 12h | 18h | 24h |
| a | Without bacterium colony | Without bacterium colony | Without bacterium colony |
| b | There is bacterium colony | There is bacterium colony | There is bacterium colony |
Room temperature about 22 °, is placed in the room of 8 square meters by fresh meat product, purifying air and preservation device shown in built-in two Fig. 1 in room, observes 4 days, and meat products is without smelly phenomenon, and experiment shows that this device can be used for sterilization fresh-keeping.
Claims (8)
1. one kind purifies air and preservation device, it is characterized in that comprising air-blast device (1), light source (2), photocatalytic degradation device (3) and shell, described air-blast device (1), light source (2), photocatalytic degradation device (3) are all fixed with described shell, the side of described light source (2) arranges photocatalytic degradation device (3), opposite side arranges air-blast device (1), and described shell has through hole; Described photocatalytic degradation device (3) comprises basalis (7) nickel screen or copper mesh, skin (5) TiO
2nanosphere thin layer and intermediate layer (6) the individual layer three-dimensional grapheme layer be positioned between basalis (7) and outer (5); Described photocatalytic degradation device (3) is prepared by following steps:
1) at protection gas and hydrogen, under 800 ~ 1300 DEG C of conditions, pass into carbon-source gas again after removing substrate surface oxide skin(coating), close carbon source after 2-10 minute, sample is cooled to room temperature rapidly, protection gas and hydrogen is closed;
2), under ice bath, by slow for butyl titanate agitation and dropping in ethanol, drop rate controls at 1-2ml/min, ultrasonic mix after, then the sample of the first step is put into reactant liquor, hydro-thermal reaction at 160-220 DEG C;
3) pass into protection gas, be heated to 400 ~ 600 DEG C of reactions after the sample clean be obtained by reacting by second step, drying, obtain basalis/three-dimensional grapheme/TiO
2nanosphere film.
2. according to claim 1ly to purify air and preservation device, it is characterized in that purifying air described and arrange damping device (4) in preservation device.
3. according to claim 1ly to purify air and preservation device, it is characterized in that purifying air described and arrange heater in preservation device.
4. according to claim 1ly purify air and preservation device, it is characterized in that passing into DC current in described photocatalytic degradation device (3), described electric current is 0.5A-1A.
5. according to claim 1ly to purify air and preservation device, it is characterized in that described light source (2) is ultraviolet light.
6. purify air according to claim 1 or 5 and preservation device, it is characterized in that the one in the preferred mercury lamp of described light source or LED light source, wherein, the wavelength of described LED light source is 375 ~ 385 nanometers.
7. according to claim 1ly to purify air and preservation device, it is characterized in that the aperture of basalis (7) in described photocatalytic degradation device (3) is 0.01-0.6mm; TiO in outer (5)
2the diameter of nanosphere is 5-100nm.
8. according to claim 1ly to purify air and preservation device, it is characterized in that the removal time described in step 1 is 5-20 minute, described carbon-source gas be selected from methane, methyl alcohol, ethanol or ethane one or more; Described protection gas is selected from argon gas or neon; Described carbon-source gas be methane or ethane time carbon-source gas flow velocity be 1-10s.c.c.m.; Described carbon-source gas be methyl alcohol or ethanol time, with the protection gas bell of 1-10s.c.c.m.; The flow velocity of described hydrogen is 100-300s.c.c.m.; Described shielding gas flow speed is 300-600s.c.c.m.; Described cooldown rate is 200-300 DEG C/min; Butyl titanate described in step 2 accounts for the 15-25% of ethanol quality; Described ethanol temperature controls at 0-5 DEG C, and the described reaction time is 4-24h; Baking temperature described in step 3 is 50-80 DEG C, and described drying condition is under vacuum, and described drying time is 3-4h; Described heating-up temperature preferably 500 DEG C, the described reaction time is 0.5-3 hour.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465899A (en) * | 2014-09-26 | 2016-04-06 | 福建省辉锐材料科技有限公司 | Air disinfection purifier and photocatalytic film preparation method thereof |
| CN106139222A (en) * | 2015-04-09 | 2016-11-23 | 藍石環球科技（香港）有限公司 | A kind of photocatalysis film preparation method of air disinfection purification apparatus and use thereof |
| CN104921252B (en) * | 2015-06-11 | 2018-09-04 | 阚晓敏 | A kind of intelligence preservation device |
| CN106721879A (en) * | 2016-12-05 | 2017-05-31 | 南京悠谷知识产权服务有限公司 | One kind purification preservation device |
| CN112469663A (en) * | 2018-07-09 | 2021-03-09 | 对数9物质科学私人有限公司 | System and synthesis method for graphene-loaded photocatalytic nanomaterial for air purification |
| CN110142042B (en) * | 2019-04-25 | 2022-02-08 | 东北大学秦皇岛分校 | RGO/TiO2Preparation method and application of/Ag aerogel photocatalyst |
| WO2021232244A1 (en) * | 2020-05-19 | 2021-11-25 | 福建新峰二维材料科技有限公司 | Air purification, sterilization and virus inactivation device |
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| CN2506091Y (en) * | 2001-11-02 | 2002-08-21 | 广东科龙电器股份有限公司 | Freshness retaining device with disinfecting and sterilizing function |
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Effective date of registration: 20160902 Address after: 362000 Fujian city of Quanzhou province Quanzhou Taiwanese Investment Zone Dongyuan Town Road 2 east longitude Road Office Patentee after: Fujian Xinfeng two Mstar Technology Ltd Address before: 5 building, administrative building, Taiwan Merchants Investment Zone, Quanzhou, Fujian, Quanzhou 362000, China Patentee before: FUJIAN PROVINCE HUIRUI MATERIAL SCIENCE & TECHNOLOGY CO., LTD. |