CN104353354A - Method for purifying air by combining electrochemical degradation with photocatalysis technique - Google Patents
Method for purifying air by combining electrochemical degradation with photocatalysis technique Download PDFInfo
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- CN104353354A CN104353354A CN201410584997.XA CN201410584997A CN104353354A CN 104353354 A CN104353354 A CN 104353354A CN 201410584997 A CN201410584997 A CN 201410584997A CN 104353354 A CN104353354 A CN 104353354A
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- photocatalysis
- electrochemical degradation
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- air purification
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Abstract
The invention discloses a method for purifying air by combining electrochemical degradation with a photocatalysis technique. A device for implementing the method mainly consists of a filtering device, a flow type electrolytic bath which is formed by using Ti/PbO2 as an anode and a stainless steel plate as a cathode, and a photocatalysis reactor which is based on a zeolite-titanium dioxide photocatalyst. The method comprises the following steps: air containing pollutants and dust particles is subjected to fiber filtration firstly, then is subjected to an electrocatalysis oxidation reaction at the anode of the flow type electrolytic bath, and enters the photocatalysis reactor for further degradation after electrolysis. Through the combination of three kinds of technologies, the filtration effect of air is improved, the problem of low speed of a photocatalysis reaction is solved, the method thoroughly solves the problem of poor efficiency of a single module, and the air purification effect is not less than 90%.
Description
Technical field
The invention belongs to air purification field, be specifically related to the air purification method of electrochemical degradation and photocatalysis technology coupling.
Background technology
Along with the raising of people's living standard, modern about had the time of 80%-90% to spend in indoor in one day, and therefore the quality of indoor environment directly affects our health.But regrettably, air-conditioning system and various ornament materials obtain between floors in a large number and use frequently, and room air pollution is growed in intensity.Room air pollution is just becoming continue " coal smoke type ", " photochemical fog type " is mark the 3rd pollutes period.Investigate according to relevant international organization, the whole world has nearly 3,000,000 people directly or indirectly to die from finishing pollution every year, and the building that is newly-built and rebuilding of 30% exists unwholesome room air pollution gas in the world.Current room air pollution source is mainly gathered in indoor because of construction material, articles for daily use and the poisonous and harmful chemistry discharged in life, physics and biotic factor, thus causes direct or indirect harm to health, causes IAQ to decline.In the rear surrounding air of finishing, VOC is as formaldehyde, the health risk that the pollutants such as Benzene and Toluene produce all obviously increases, these pollutants have harm in various degree to human body because of the difference of concentration, time of contact, mainly contain Cure of Sick Building Syndrome, building relevant disease and chemical substance allergy etc., and finishing after the harm of pollution to preschool child maximum.Many research shows, the cases of cancer that formaldehyde causes every year accounts for whole 1.57%, and the injury between infantile period may have impact to the health in all one's life of this person.Therefore, be necessary to pay close attention to room air pollution to our health hazard.So we are necessary further further investigation, take measures, improve IAQ, ensure that resident is healthy.
The common method that households purifies the air of a room mainly contains following several:
1. gravity-flow ventilation method
Ventilation is the method the most simply removing the indoor harmful gas such as formaldehyde.This method is mainly used in the lighter occasion of pollution level, spring, summer and autumn will according to the difference of weather and occupancy number determine to take a breath frequency, at least to window usual every day in winter ventilation more than 30 minutes, but temperature is on the low side in winter, most family in the winter time in decrease the number of times of windowing, although therefore this kind of method simple economy, the cycle is longer, slowly, can not deal with problems from root in the space for sustained release pollutant in purification.
2. carbon fiber adsorption and catalytic combustion method
NACF one adsorbate is divided go deep into fast going in the inner less hole of active carbon, and two is as catalytic carrier, and catalyst is deposited in micropore on a small quantity, is mostly deposited in macropore and mesopore.Because carbon surface amasss micropore specific area greatly, the ratio of functional group increases, and is conducive to the absorption of formaldehyde gas.But activated carbon fiber is due to its limitation, little active carbon, as the method for independent process Formaldehyde Pollution of Indoor Air, often coordinates additive method integrated treatment formaldehyde, utilize active carbon physical absorption and as catalyst carrier.Simultaneously because purification cycle is short, need periodic replacement.The contaminant particle adsorbed when temperature, humidity, wind speed are elevated to a certain degree likely dissociates out, causes secondary pollution.
3. plant purification method
Green plants depends primarily on microorganism in the root of plant and soil and moisture to the catharsis that some harmful substance in room air has, and leaf has certain catharsis, but is not main body.There are some researches show, whole day 24 hours plants receive the stronger plant of formaldehyde ability to be: close fruit taro, chinese cymbidium, nieffea picta.But the metabolism of plant purification and plant self, surrounding environment has very important relation.Under varying environment, different plant purification pollutant kind is different from effect.Beautify the environment although this purification style is double and purifies and one, purification mechanism needs to be studied, and some plant is unfavorable to health, and can decay by purifying property after plant absorption pollutes, purification efficiency is unstable; Some plant market is not easy to buy.
4. formaldehyde scavenger method
Fine and close molecular film is formed, with pollutants such as isolated formaldehyde on the article material surface of Form aldehyde release.This method is efficient, lasting, on article surface without impact.Formaldehyde scavenger can not remove formaldehyde, just isolates formaldehyde, fundamentally can not play the effect of purifying formaldehyde.So use spraying process effective for the article of release high density pollution, but heavy wear and the fracture of article surface to be avoided, use can not be folded with other purified product simultaneously, can not be mixed with other purification methods.
In recent years, photocatalysis technology receives the concern of Chinese scholars day by day as a kind of high-level oxidation technology.Nearly all organic matter can complete oxidation be CO under photocatalysis
2, H
2the simple inorganic matter such as O.Especially with metal-oxide semiconductor (MOS) titanium dioxide (TiO in photocatalyst
2) the most typical.That reports both at home and abroad at present utilizes TiO
2in catalytic oxidation organic pollution technology, mainly utilize the TiO of decentralized photo
2with the TiO of Stationary liquid
2.Photocatalysis technology has the following advantages relative to other technology such as filtration, absorption: (1) reaction condition is gentle, carries out at normal temperatures and pressures; (2) reaction rate is fast, and required time is short; (3) majority of organic pollutants can be degraded to small-molecule substance.
Photocatalysis general principle is theoretical based on the photo-generate electron-hole of band theory, wherein, using semiconductor as the most study of photochemical catalyst.Light Cuiization oxidation technology is often catalyst with titanium dioxide, titanium dioxide has discontinuous band structure, the low energy valence band being full of electronics by one and an empty higher energy conduction band are formed, and the region be present between valence band and conduction band is called forbidden band, energy gap Eg=3.2eV.When the light-wave irradiation that can be more than or equal to 3.2eV (wavelength is less than 380nm) is to titanium dioxide surface, partial valence having electronic absorbs energy and energy level transition occurs, after in electron transition to conduction band, a hole can be produced accordingly in valence band, form electron hole pair thus.When electron hole pair has sufficiently long life period, the pollutant generation redox reaction just can adsorbed with titanium dioxide surface thus realize contaminant degradation being C0
2and H
2the object of 0.
Photocatalysis technology also has its limitation: photocatalytic applications is the immobilization of photochemical catalyst and the feature of surface reaction in the subject matter of actual organic matter degradation, determines the degraded that photocatalysis technology is more suitable for light concentration organic pollutant.
Electrochemical degradation is that a kind of electrolysis generation strong oxidizer that relies on is to be oxidized the New Wastewater Treatment Technique of each pollutant.With the physical-chemical process of routine compared with biochemical process, electrochemical degradation has many outstanding advantages.First, the OH that electrolytic process Anodic produces has very strong oxidisability, and can react without the organic pollution selectively directly and in waste water, be degraded to the simple organic such as carbon dioxide, water, treatment effeciency is high, and seldom produces secondary pollution.Secondly, electrochemical degradation can carry out at normal temperatures and pressures, and reaction condition is gentle.Again one, electrochemical degradation both can process separately, can combine again with other treatment technology, as the pre-treatment as biochemical process, in order to improve the biodegradability of waste water.In addition, electrochemical degradation is simple to operate, easily realizes automation.In recent years, electrochemical degradation technology has carried out application study in fields such as percolate, leather-making waste water, dyeing waste water, waste water from dyestuff, coking chemical waste water, refinery(waste) waters, achieves greater advance, makes the expectation of people to this technology more urgent.
Summary of the invention
The object of this invention is to provide the air purification method of electrochemical degradation and photocatalysis technology coupling, play electrochemistry and photocatalysis at the same time separately while advantage, realize the synergy of two kinds of techniques, effectively raise air purification effect.
Electricity the object of this invention is to provide the air purification method of fiber filter, electrochemical degradation and photocatalysis technology coupling, and the present invention can be good at dedusting, removes the pollutant in air, and can good sterilization.
The air purification method of electrochemical degradation of the present invention and photocatalysis technology coupling is: by with Ti/PbO
2film-coated plate is anode, and corrosion resistant plate is the filter-press type flow cell channel that negative electrode is formed, and under constant voltage mode (electrode voltage is 10-15V), the air containing pollutant, at the anode generation electrocatalysis oxidation reaction of flow-type electrolytic cell, carries out electrochemical degradation; , the gas after electrolysis enters and is equipped with in the photo catalysis reactor of photochemical catalyst, and under uviol lamp effect, the organic pollution in air issues third contact of a total solar or lunar eclipse catalytic oxidation in the effect of hydrone catalysis, zeolite adsorption and realizes degraded further; The simultaneously capturing agent of analysing light induced electron when oxygen that oxygen side reaction produces is photocatalysis oxidation reaction of electrocatalysis oxidation reaction, the separative efficiency in photocatalysis light induced electron and hole can be improved, thus realize the synergy to wastewater treatment of electrochemical degradation and photocatalysis technology coupling; Before electrolytic cell, filter is housed.
The anodic-cathodic spacing of described flow-type electrolytic cell is 1-4mm.
The current density of described flow-type electrolytic cell is 15-30mA/cm
2.
Electrolyte in described electrolytic cell is sodium sulphate, potassium sulfate, sodium nitrate or potassium nitrate.
Described photochemical catalyst is based on zeolite-titanium dioxide optical catalyst, by titanium dichloride load on zeolite.
The power of the uviol lamp in described photo catalysis reactor is 18-30W, and wavelength is 253nm.
Described filter adopts multi-level fiber filter material, and fiber filter material specification is 5-30ppi.
Compared with prior art, the present invention has following beneficial effect:
(1) adopt filter the particle major part in air can be filtered, reach more than 90%.
(2) with netted Ti/PbO
2for anode, corrosion resistant plate is that the organic matter in air can be dissolved in electrolytic solution by the filter-press type flow cell channel that negative electrode is formed, and real-time decomposition, gas after first electrochemical method is not only with photocatalysis technology catalyst-hydrone, and the oxygen that electrolytics produces simultaneously effectively can promote light-catalyzed reaction.
(3) photochemical catalyst adopts zeolite-titanium dioxide optical catalyst, and the suction-operated of zeolite can by remaining Adsorption of Organic on photochemical catalyst, and under light-illuminating, organic matter is decomposed.
(4), under the electrochemical degradation in the air purification method of electrochemical degradation and photocatalysis technology coupling and photocatalysis technology act synergistically, air purification effect is not less than 95%.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further:
Embodiment 1
Experiment is selected: filter adopts two layers of filtration, and 1 grade is filtered the fiber filter material adopting 20ppi, and 2 grades are filtered the fiber filter material adopting 5ppi; Flow-type electrolytic cell adopts Ti/PbO
2film-coated plate is anode, and corrosion resistant plate is negative electrode, and between electrode, spacing is 4mm, and electrode voltage is 10V, and current density is 50mA/cm
2, electrolyte adopts the sodium sulphate of 0.1mol/L; Light-catalyzed reaction pond adopt power be 18w, wavelength be the uviol lamp of 253nm as light source, photochemical catalyst adopt zeolite-titanium dioxide optical catalyst; Simulated exhaust is adopted to select ethylene gas (Standard Gases of 0.0500% ± 0.0002%, carrier gas adopts standard cleaning air) to mix 20mg dust granules.
Reactivity worth: the particle filtering rate of filter is 95%, electrolytic cell and light-catalysed synergy improve the organic efficiency of photochemical catalytic oxidation, make the conversion ratio of ethene on electrolytic cell and zeolite-titanium dioxide optical catalyst bring up to 95% synergy from independent 50% and 60%.
Embodiment 2
Experiment is selected: filter adopts three layer filtration, and 1 grade is filtered the fiber filter material adopting 30ppi, and 2 grades are filtered the fiber filter material adopting 20ppi, and 3 grades are filtered the fiber filter material adopting 5ppi; Flow-type electrolytic cell adopts Ti/PbO
2film-coated plate is anode, and corrosion resistant plate is negative electrode, and between electrode, spacing is 1mm, and electrode voltage is 15V, and current density is 15mA/cm
2, electrolyte adopts the potassium sulfate of 0.5mol/L; Light-catalyzed reaction pond adopt power be 30w, wavelength be the uviol lamp of 253nm as light source, photochemical catalyst adopt zeolite-titanium dioxide optical catalyst; Simulated exhaust is adopted to select formaldehyde gas (Standard Gases of 0.0500% ± 0.0002%, carrier gas adopts standard cleaning air) to mix 30mg dust granules.
Reactivity worth: the particle filtering rate of filter is 97%, electrolytic cell and light-catalysed synergy improve the organic efficiency of photochemical catalytic oxidation, make the conversion ratio of formaldehyde on electrolytic cell and zeolite-titanium dioxide optical catalyst bring up to 96% synergy from independent 45% and 65%.
Embodiment 3
Experiment is selected: filter adopts three layer filtration, and 1 grade is filtered the fiber filter material adopting 30ppi, and 2 grades are filtered the fiber filter material adopting 10ppi, and 3 grades are filtered the fiber filter material adopting 5ppi; Flow-type electrolytic cell adopts Ti/PbO
2film-coated plate is anode, and corrosion resistant plate is negative electrode, and between electrode, spacing is 2mm, and electrode voltage is 11V, and current density is 20mA/cm
2, electrolyte adopts the potassium nitrate of 0.3mol/L; Light-catalyzed reaction pond adopt power be 20w, wavelength be the uviol lamp of 253nm as light source, photochemical catalyst adopt zeolite-titanium dioxide optical catalyst; Simulated exhaust is adopted to select formaldehyde gas (Standard Gases of 0.0500% ± 0.0002%, carrier gas adopts standard cleaning air) to mix 20mg dust granules.
Reactivity worth: the particle filtering rate of filter is 93%, electrolytic cell and light-catalysed synergy improve the organic efficiency of photochemical catalytic oxidation, make the conversion ratio of formaldehyde on electrolytic cell and zeolite-titanium dioxide optical catalyst bring up to 97% synergy from independent 60% and 58%.
Embodiment 4
Experiment is selected: filter adopts three layer filtration, and 1 grade is filtered the fiber filter material adopting 20ppi, and 2 grades are filtered the fiber filter material adopting 10ppi, and 3 grades are filtered the fiber filter material adopting 5ppi; Flow-type electrolytic cell adopts Ti/PbO
2film-coated plate is anode, and corrosion resistant plate is negative electrode, and between electrode, spacing is 1.5mm, and electrode voltage is 13V, and current density is 30mA/cm
2, electrolyte adopts the sodium nitrate of 0.4mol/L; Light-catalyzed reaction pond adopt power be 25w, wavelength be the uviol lamp of 253nm as light source, photochemical catalyst adopt zeolite-titanium dioxide optical catalyst; Simulated exhaust is adopted to select formaldehyde gas (Standard Gases of 0.0500% ± 0.0002%, carrier gas adopts standard cleaning air) to mix 25mg dust granules.
Reactivity worth: the particle filtering rate of filter is 96%, electrolytic cell and light-catalysed synergy improve the organic efficiency of photochemical catalytic oxidation, make the conversion ratio of formaldehyde on electrolytic cell and zeolite-titanium dioxide optical catalyst bring up to 99% synergy from independent 40% and 55%.
Embodiment 5
Experiment is selected: filter adopts one deck to filter, and adopts the fiber filter material of 30ppi; Flow-type electrolytic cell adopts Ti/PbO
2film-coated plate is anode, and corrosion resistant plate is negative electrode, and between electrode, spacing is 4mm, and electrode voltage is 12V, and current density is 15mA/cm
2, electrolyte adopts the sodium sulphate of 0.01mol/L; Light-catalyzed reaction pond adopt power be 18w, wavelength be the uviol lamp of 253nm as light source, photochemical catalyst adopt zeolite-titanium dioxide optical catalyst; Simulated exhaust is adopted to select ethylene gas (Standard Gases of 0.0500% ± 0.0002%, carrier gas adopts standard cleaning air) to mix 20mg dust granules.
Reactivity worth: the particle filtering rate of filter is 91%, electrolytic cell and light-catalysed synergy improve the organic efficiency of photochemical catalytic oxidation, make the conversion ratio of ethene on electrolytic cell and zeolite-titanium dioxide optical catalyst bring up to 95% synergy from independent 44% and 50%.
Embodiment 6
Experiment is selected: filter adopts three layer filtration, and 1 grade is filtered the fiber filter material adopting 30ppi, and 2 grades are filtered the fiber filter material adopting 5ppi, and 3 grades are filtered the fiber filter material adopting 5ppi; Flow-type electrolytic cell adopts Ti/PbO
2film-coated plate is anode, and corrosion resistant plate is negative electrode, and between electrode, spacing is 1mm, and electrode voltage is 15V, and current density is 30mA/cm
2, electrolyte adopts the potassium nitrate of 0.4mol/L; Light-catalyzed reaction pond adopt power be 30w, wavelength be the uviol lamp of 253nm as light source, photochemical catalyst adopt zeolite-titanium dioxide optical catalyst; Simulated exhaust is adopted to select ethylene gas (Standard Gases of 0.0500% ± 0.0002%, carrier gas adopts standard cleaning air) to mix 50mg dust granules.
Reactivity worth: the particle filtering rate of filter is 97%, electrolytic cell and light-catalysed synergy improve the organic efficiency of photochemical catalytic oxidation, make the conversion ratio of ethene on electrolytic cell and zeolite-titanium dioxide optical catalyst bring up to 98% synergy from independent 60% and 58%.
The foregoing is only some embodiments of the present invention, do not limit the present invention, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, all drop in protection scope of the present invention.
Claims (7)
1. an air purification method for electrochemical degradation and photocatalysis technology coupling, is characterized in that: by with Ti/PbO
2for anode, corrosion resistant plate is the filter-press type flow cell channel that negative electrode is formed, and under constant voltage mode (electrode voltage is 10-15V), the air containing pollutant, at the anode generation electrocatalysis oxidation reaction of flow-type electrolytic cell, carries out electrochemical degradation; , the gas after electrolysis enters and is equipped with in the photo catalysis reactor of photochemical catalyst, and under uviol lamp effect, the organic pollution in air issues third contact of a total solar or lunar eclipse catalytic oxidation in the effect of hydrone catalysis, zeolite adsorption and realizes degraded further; The simultaneously capturing agent of analysing light induced electron when oxygen that oxygen side reaction produces is photocatalysis oxidation reaction of electrocatalysis oxidation reaction, the separative efficiency in photocatalysis light induced electron and hole can be improved, thus realize the synergy to wastewater treatment of electrochemical degradation and photocatalysis technology coupling; Before electrolytic cell, filter is housed.
2. the air purification method of electrochemical degradation according to claim 1 and photocatalysis technology coupling, is characterized in that: the anodic-cathodic spacing of described flow-type electrolytic cell is 1-4mm.
3. the air purification method of electrochemical degradation according to claim 1 and photocatalysis technology coupling, is characterized in that: the current density of described flow-type electrolytic cell is 15-30mA/cm
2.
4. the air purification method of electrochemical degradation according to claim 1 and photocatalysis technology coupling, is characterized in that: the electrolyte in described electrolytic cell is sodium sulphate, potassium sulfate, sodium nitrate or potassium nitrate.
5. the air purification method of electrochemical degradation according to claim 1 and photocatalysis technology coupling, is characterized in that: described photochemical catalyst is based on zeolite-titanium dioxide optical catalyst, by titanium dichloride load on zeolite.
6. the air purification method of electrochemical degradation according to claim 1 and photocatalysis technology coupling, is characterized in that: the power of the uviol lamp in described photo catalysis reactor is 18-30W, and wavelength is 253nm.
7. the air purification method of electrochemical degradation according to claim 1 and photocatalysis technology coupling, is characterized in that: described filter adopts multi-level fiber filter material, and fiber filter material specification is 5-30ppi.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106045141A (en) * | 2016-06-30 | 2016-10-26 | 浙江大学苏州工业技术研究院 | Method and device for electrochemical treatment of medical and chemical wastewater |
| CN109200816A (en) * | 2018-11-28 | 2019-01-15 | 佛山科学技术学院 | A kind of photocatalysis treatment volatile organic contaminant circular treatment collection device |
| CN110652849A (en) * | 2018-06-29 | 2020-01-07 | 江苏中远环保科技有限公司 | VOCs recovery processing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555082A (en) * | 2008-04-09 | 2009-10-14 | 中国科学院理化技术研究所 | Wastewater treatment method and device combining electrochemical degradation and photocatalysis oxidation technologies |
| CN103981537A (en) * | 2014-05-06 | 2014-08-13 | 同济大学 | Preparation method and application of Pd/3DOM TiO2/BDD electrode used for photoelectrocatalytic reduction treatment of organic pollutants |
-
2014
- 2014-10-28 CN CN201410584997.XA patent/CN104353354A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555082A (en) * | 2008-04-09 | 2009-10-14 | 中国科学院理化技术研究所 | Wastewater treatment method and device combining electrochemical degradation and photocatalysis oxidation technologies |
| CN103981537A (en) * | 2014-05-06 | 2014-08-13 | 同济大学 | Preparation method and application of Pd/3DOM TiO2/BDD electrode used for photoelectrocatalytic reduction treatment of organic pollutants |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106045141A (en) * | 2016-06-30 | 2016-10-26 | 浙江大学苏州工业技术研究院 | Method and device for electrochemical treatment of medical and chemical wastewater |
| CN110652849A (en) * | 2018-06-29 | 2020-01-07 | 江苏中远环保科技有限公司 | VOCs recovery processing device |
| CN109200816A (en) * | 2018-11-28 | 2019-01-15 | 佛山科学技术学院 | A kind of photocatalysis treatment volatile organic contaminant circular treatment collection device |
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Application publication date: 20150218 |