CN103878007A - Visible light catalysis composite material for absorbing and decomposing automobile exhaust on pavement as well as preparation method thereof - Google Patents
Visible light catalysis composite material for absorbing and decomposing automobile exhaust on pavement as well as preparation method thereof Download PDFInfo
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Abstract
The invention relates to a visible light catalysis composite material for absorbing and decomposing pavement automobile exhaust as well as a preparation method thereof. The composite material consists of porous minerals containing nano materials, wherein the nano materials are nano CaCO3 and nano Ag2O/TiO2; the porous minerals are one or more than two of silicon gel, zeolite, pumice, montmorillonite, ceramsite, tourmaline or sepiolite. The invention also provides the preparation method of the composite material. The visible light catalysis composite material for absorbing and decomposing pavement automobile exhaust can effectively adsorb automobile exhaust on the surfaces of photocatalysis particles to decompose the automobile exhaust, and convert NOx into calcium nitrate finally, and the pavement automobile exhaust absorption and decomposition efficiency is high; the catalysis composite material is wide in absorption spectrum range, and has high catalysis activity in a visible light region; moreover, the surface of the composite material is also subjected to spraying or immersing treatment by a silane coupling agent, and has favorable bonding force with bituminous pavements.
Description
Technical field
The present invention relates to a kind of visible light catalytic composite that absorbs decomposition pavement automobile exhaust and preparation method thereof, be applicable to the degraded of the pavement automobile exhausts such as urban road, parking lot, tunnel, charge station, belong to technical field of new material preparation.
Background technology
Automobile exhaust pollution is the environmental pollution being caused by the waste gas of motor vehicle emission, is one of outstanding environmental problem of highway communication generation.Along with the increasing of automobile quantity, the scope of application are more and more wider, in overhead, near Highway area, often form the higher and long-term exhaust emission object area of concentration.Vehicle exhaust is also increasing to the negative effect of world environments, and serious harm urban environment causes respiratory disease, increases the weight of urban heat land effect etc.According to relevant expert's statistics, at the beginning of 21 century, the tail gas of motor vehicle emission accounts for 30%～60% of atmosphere pollution.Along with the increase of motor vehicle, tail gas pollution becomes worse, and is polluted and is transformed into continuity and accumulative pollution by locality.Learn from the Ministry of Public Security in January, 2014, within 2013, China's vehicle keeps rapid growth, and to the end of the year 2013, national vehicles number is broken through 2.5 hundred million, and wherein, automobile reaches 1.37 hundred million, and deduction learies, increases by 1,651 ten thousand, has increased by 13.7%; Automobile focuses mostly in city, cause these pernicious gases in vehicle exhaust to change the formation recurring structure of urban pollution resource, vehicle exhaust is just rising to the primary pollution source in China city, in vehicle exhaust, contain carbon monoxide, nitrogen oxide and human body is produced to dysgenic some other solid particle, especially doped fuel, serious threat human body health.The economic loss that the pollution of vehicle exhaust starts to the whole world is also immeasurable, and relevant expert estimates, continuing the proportion that the year two thousand twenty In The Atmosphere Over China pollution loss accounts for GDP will be up to 13%, and economic loss is surprising.
Solve vehicle exhaust the major measure of atmosphere pollution is comprised to compulsory administrative measure, tail gas emission controls by improving combustion (New-type fuel) and (three-way catalyst) measure of tail gas external purification and the new material (building coating) of various degradable tail gas of appearance in recent years.But all there are some insoluble problems in existing these methods aspect economy or practicality." day with no cars " and Pekinese " odd or even number trip " that in September, 2007 is tentative in several big cities of China; Board policy is implemented to clap for many years in Shanghai; Beijing, Shanghai, Guangzhou, Tianjin and city, 5, Kweiyang in 2010 come into effect automobile limit and purchase, and in 2013 7 months, vapour association predicts the possibility that 8 cities such as Tianjin, Shenzhen, Hangzhou, Shijiazhuang, Chongqing, Qingdao, Wuhan all exist enforcement limit to purchase; Although the restriction exhaust emissions that these administrative control measure can be to a great extent, improves air quality, there is great difficulty in this measure management and control aspect, and bring certain difficulty to resident's trip, is a kind of method of curing the symptoms, not the disease; The exploitation of New-type fuel needs a large amount of scientific researches and the input of funds, also has certain difficulty on applying; Though three-way catalyst has been studied application for many years, but still exist a lot of insoluble difficult problems, such as cold start-up problem, Cost Problems etc.; The hot topic that more existing environmental protection coating materials are Recent study in the world, but at home also in the starting stage, the application of large-engineering amount also has certain difficulty.
Employing nano-photocatalyst material purifying automobile tail gas is that the vehicle exhaust to entering atmospheric environment is taked control techniques, and this technology is one of new technology of air pollution control.Photocatalysis technology decomposing automobile exhaust technology can, directly under the effect of light, make exhaust pollutant mineralising, and this technology non-secondary pollution.Catalyst for optical catalytic environment purification pollutant mostly is N-shaped semiconductor, as titanium dioxide, zinc oxide, cadmium sulfide, tin ash and di-iron trioxide etc.TiO
2nano-photocatalyst material, because it is nontoxic, to human body and environmentally friendly, efficient, multi-functional, and has the features such as stronger redox ability, chemical stability, environment friendliness, becomes the promising environmental protection photochemical catalyst of tool.Ground surface material and road equipment be vehicle exhaust directly hold receptor, if by TiO
2nano-photocatalyst material is compounded in cement concrete or asphalt matrix, or be sprayed directly on cement concrete pavement and asphaltic road-mix surface course, make environment-friendly type water cement concrete or asphaltic road-mix surface course material, or nano-photocatalyst material is made to environmental protection coating material brushing on road equipment, will further eliminate automobile exhaust pollution.This material just starts it to purify in the time that vehicle exhaust is just discharged, without the energy (except solar energy), its good purification.Photocatalysis technology being applied in the middle of the research of degraded vehicle exhaust, is the grow a lot pollutant catalytic purification new technology of potentiality of tool, and it is a kind of energy-conservation, efficient green environmental protection technique, has good application prospect.
But, TiO
2as a kind of wide bandgap semiconductor materials, photocatalytic activity is high, and the utilization rate of solar energy is low, and greater band gap (anatase is 3.2ev) can only absorbing wavelength be less than the ultraviolet radiant light of 387.5nm; And light-catalyzed reaction belongs to surface reaction, if want catalytic decomposition vehicle exhaust, first tail gas need be adsorbed on to the surface of catalyst granules, these shortcomings have seriously restricted the practical application in industry of photocatalysis technology.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of visible light catalytic composite that absorbs decomposition pavement automobile exhaust and preparation method thereof.This composite can effectively be adsorbed on photocatalytic particle surface by vehicle exhaust and decompose, by TiO
2nO is expanded to visible region and made to the absorption spectrum of photochemical catalyst
xfinally change into calcium nitrate, thereby improved the photocatalytic degradation efficiency of vehicle exhaust.
Technical scheme of the present invention is as follows:
Absorb a visible light catalytic composite that decomposes pavement automobile exhaust, this composite is made up of the porous mineral that contains nano material; Described nano material is nanometer CaCO
3there is nanometer Ag with load
2the nano-TiO of O
2(nanometer Ag
2o/TiO
2), described porous mineral is a kind of or two or more in silica gel, zeolite, float stone, montmorillonite, haydite, tourmaline or sepiolite; Described nanometer CaCO
3and nanometer Ag
2o/TiO
2weight ratio be (0.1-2): 1, described nanometer CaCO
3and nanometer Ag
2o/TiO
2gross weight be 1:(1-10 with the ratio of the weight of porous mineral).
According to the present invention, preferred, described nanometer Ag
2o/TiO
2in, nanometer Ag
2o and nano-TiO
2weight ratio be (0.1-1): 1.
According to the present invention, preferred, described nanometer CaCO
3average grain diameter be 30-500nm, described nanometer Ag
2o/TiO
2average grain diameter be 30-200nm.
According to the present invention, preferably, spraying or the immersion treatment of silane coupler also passed through on the surface of described composite, further preferred, described silane coupler is KH-402, KH-550, KH-560, KH-570, KH-580, KH-590, KH-602, KH-792, KH-171 or KH-151.Composite through silane coupler processing can obtain oil-wetted surface, makes this composite and bituminous paving have good cohesive force.
Nanometer Ag of the present invention
2o/TiO
2commercially available, can make by oneself; Preferably prepare as follows:
By nano-TiO
2join in water, add silver nitrate, ultrasonic dispersion, magnetic agitation is even; Dripping sodium hydroxide solution precipitated silver ion to final pH is 14; Filter, washing, dry, obtain nanometer Ag
2o/TiO
2.
According to the present invention, the preparation method of the visible light catalytic composite of pavement automobile exhaust is decomposed in above-mentioned absorption, comprises that step is as follows:
(1) by nanometer CaCO
3and nanometer Ag
2o/TiO
2join in water or ethanol, ultrasonic dispersion or dispersed with stirring are even, obtain nano material suspension; Described nanometer CaCO
3and nanometer Ag
2o/TiO
2gross weight be (0.01-0.1) with the ratio of the volume of water or ethanol: (10-100) g/ml; Described nanometer CaCO
3and nanometer Ag
2o/TiO
2weight ratio be (0.1-2): 1;
(2) in the nano material suspension obtaining to step (1), add porous mineral, stir; Nanometer CaCO in described porous mineral and step (1)
3and nanometer Ag
2o/TiO
2the ratio of gross weight be (1-10): 1;
(3) product Separation of Solid and Liquid step (2) being obtained, gained solid is through water or ethanol washing, dry, to obtain final product.
According to the present invention, preferred, the nanometer Ag that step (1) is described
2o/TiO
2in, nanometer Ag
2o and nano-TiO
2weight ratio be (0.1-1): 1.
According to the present invention, preferred, the mode of the Separation of Solid and Liquid described in step (3) is for filtering or centrifugation; Described is dried as common dry or vacuum drying or infra-red drying, and baking temperature is 60-120 ℃.
According to the present invention, preferred, above-mentioned steps (3) continues following steps afterwards:
(4) the dry product surface obtaining of step (3) is sprayed to silane coupler or silane coupler solution; The use amount of silane coupler is the 0.5-3% of the dry product weight obtaining of step (3); The composite spraying after silane coupler stirs 10-60 minute, 60-120 ℃ of common dry or vacuum drying or the dry 1-5h of infra-red drying.
The present invention, preferably by silane coupler wiring solution-forming, is conducive to the dispersion of silane coupler at material surface.The weight of described solution consists of silane 20%, alcohol 72% and water 8%; Described silane coupler is KH-402, KH-550, KH-560, KH-570, KH-580, KH-590, KH-602, KH-792, KH-171 or KH-151; Further preferred, in the time that described silane coupler is Ethoxysilane, described alcohol is ethanol; In the time that described silane coupler is methoxy silane, described alcohol is methyl alcohol; When silane beyond described silane coupler is Ethoxysilane and methoxy silane, described alcohol is isopropyl alcohol; Described silane coupler is except amino silane, and other silane couplers add vinegar acid for adjusting pH value 4-5.
When the visible light catalytic composite use of pavement automobile exhaust is decomposed in absorption of the present invention, this composite is made into suspension slip to be sprayed, this slip proportioning is 10-30 part composite, 70-90 part water and 0-5 part surfactant, is weight portion; Described surfactant is ionic surfactant or nonionic surface active agent or special surfactant, and preferred surfactant is polyacrylamide, sodium cetanesulfonate or polyvinylpyrrolidone (PVP-K30).
Absorption of the present invention is decomposed in the visible light catalytic composite of pavement automobile exhaust, and porous mineral has the effect of playing absorbing automobile exhaust; Nanometer CaCO
3can make NOx finally change into calcium nitrate, at nano-TiO
2area load nanometer Ag
2o can greatly improve ultraviolet light and visible light catalysis activity.
Beneficial effect of the present invention:
1, the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption of the present invention, and vehicle exhaust effectively can be adsorbed on to photocatalytic particle surface and decompose, and by NO
xfinally change into calcium nitrate, the efficiency that absorbs decomposition pavement automobile exhaust is high.
2, the absorption spectrum ranges of the visible light catalytic composite of absorption decomposition pavement automobile exhaust of the present invention is wide, just has higher catalytic activity in visible region.
3, the present invention absorbs that to decompose the preparation method of visible light catalytic composite of pavement automobile exhaust simple, and raw material is cheap and easy to get, environmental friendliness.
The specific embodiment
Below by specific embodiment, the present invention will be further described, but be not limited to inferior.
Nanometer Ag used in embodiment
2o/TiO
2for preparing in accordance with the following steps:
By 0.2g Degussa nano-TiO
2p25 joins in 50ml water, adds 0.145g silver nitrate, ultrasonic dispersion, magnetic agitation 30min; Then the sodium hydroxide solution of 50ml0.1mol/L is added drop-wise in above-mentioned solution slowly, the consumption of NaOH enough precipitates all silver ions, and extremely final pH is 14; Through washing, 100 ℃ of dry 2h, obtain nanometer Ag
2o/TiO
2, nanometer Ag
2o/TiO
2the average grain diameter of particle is 30-200nm.
Nanometer CaCO used in embodiment
3selecting average grain diameter is the commercially available prod of 500nm.
Embodiment 1
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.05g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 0.2g80-150 object sepiolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 100 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-550, and the use amount of KH-550 is 1% of the dry product weight obtaining of step (3).
Embodiment 2
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.05g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 0.2g80-150 object tourmaline, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, 100 ℃ of dry 60min;
(4) product surface obtaining in step (3) sprays KH-550, and the use amount of KH-550 is 1% of the dry product weight obtaining of step (3).
Embodiment 3
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.05g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 0.5g80-150 object sepiolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 100 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-550, and the use amount of KH-550 is 1% of the dry product weight obtaining of step (3).
Embodiment 4
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.05g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 0.1g80-150 object sepiolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, 100 ℃ of dry 60min;
(4) product surface obtaining in step (3) sprays KH-580, and the use amount of KH-580 is 3% of the dry product weight obtaining of step (3).
Embodiment 5
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.05g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 1.0g80-150 object sepiolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 100 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-580, and the use amount of KH-580 is 3% of the dry product weight obtaining of step (3).
Embodiment 6
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.1g nanometer CaCO
3with 0.05g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 1.0g80-150 object sepiolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 100 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-580, and the use amount of KH-580 is 3% of the dry product weight obtaining of step (3).
Embodiment 7
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.5g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 3.0g80-150 object montmorillonite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 100 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-580, and the use amount of KH-580 is 3% of the dry product weight obtaining of step (3).
Embodiment 8
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.1g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 1.0g80-150 object zeolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 100 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-580, and the use amount of KH-580 is 3% of the dry product weight obtaining of step (3).
Embodiment 9
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.25g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 1.0g80-150 object sepiolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 100 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-570, and the use amount of KH-570 is 1% of the dry product weight obtaining of step (3).
Embodiment 10
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.1g nanometer CaCO
3with 0.05g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 0.5g80-150 object tourmaline, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 60 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-570, and the use amount of KH-570 is 3% of the dry product weight obtaining of step (3).
Embodiment 11
A preparation method who absorbs the visible light catalytic composite that decomposes pavement automobile exhaust, comprises that step is as follows:
(1) by 0.05g nanometer CaCO
3with 0.25g nanometer Ag
2o/TiO
2join in the distilled water of 100ml, ultrasonic dispersion 10min, obtains nano material suspension;
(2) in the nano material suspension obtaining to step (1), add 1.0g80-150 object sepiolite, stir 30min, rotating speed is 500 turn/min;
(3) product filtration under diminished pressure step (2) being obtained, gained solid washs through distilled water, and 80 ℃ of dry 60min, to obtain final product.
(4) product surface obtaining in step (3) sprays KH-570, and the use amount of KH-570 is 2% of the dry product weight obtaining of step (3).
Application examples
Visible light catalytic composite prepared by embodiment 1-3 is applied to absorb and decomposes simulated roadway vehicle exhaust, and step is as follows:
(1) the visible light catalytic composite of being prepared by embodiment 1-3 is made into suspension slip and sprays, and this slip proportioning is 30g composite, 90g water and 1g PVP K30 surfactant;
(2) rut test piece of making according to " highway engineering pitch and Asphalt Mixture Experiment rules " is in advance cut into 15cm*15cm*5cm size, mix type is SMA-13;
(3) slip of preparation in step (1) is sprayed on bitumen mixture specimen, natural air drying 1 hour, inserts 3 test specimens in airtight transparent simulated automotive tail gas decomposing system, carries out visible photocatalytic test,
Intensity of illumination is 40w, NO
2initial concentration is 20ppm, and 2 hours testing times, test result is as shown in table 1:
Table 1
Note: the front adsorption experiment (adsorption time is 20min) that first carries out is carried out in light-catalyzed reaction, in table, corresponding reaction time 0min is designated as 0min the time that absorption reaches balance turn on lights source.
Claims (10)
1. absorb a visible light catalytic composite that decomposes pavement automobile exhaust, it is characterized in that this composite is made up of the porous mineral that contains nano material; Described nano material is nanometer CaCO
3and nanometer Ag
2o/TiO
2, described porous mineral is a kind of or two or more in silica gel, zeolite, float stone, montmorillonite, haydite, tourmaline or sepiolite; Described nanometer CaCO
3and nanometer Ag
2o/TiO
2weight ratio be (0.1-2): 1, described nanometer CaCO
3and nanometer Ag
2o/TiO
2gross weight be 1:(1-10 with the ratio of the weight of porous mineral).
2. the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 1, it is characterized in that described nanometer Ag
2o/TiO
2in, nanometer Ag
2o and nano-TiO
2weight ratio be (0.1-1): 1.
3. the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 1, it is characterized in that described nanometer CaCO
3average grain diameter be 30-500nm, described nanometer Ag
2o/TiO
2average grain diameter be 30-200nm.
4. the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 1, spraying or immersion treatment that silane coupler is also passed through on the surface of the composite described in it is characterized in that, described silane coupler is KH-402, KH-550, KH-560, KH-570, KH-580, KH-590, KH-602, KH-792, KH-171 or KH-151.
5. a preparation method for the visible light catalytic composite of pavement automobile exhaust is decomposed in the absorption described in claim 1-4 any one, comprises that step is as follows:
(1) by nanometer CaCO
3and nanometer Ag
2o/TiO
2join in water or ethanol, ultrasonic dispersion or dispersed with stirring are even, obtain nano material suspension; Described nanometer CaCO
3and nanometer Ag
2o/TiO
2gross weight and the volume ratio of water or ethanol be (0.01-0.1): (10-100) g/ml; Described nanometer CaCO
3and nanometer Ag
2o/TiO
2weight ratio be (0.1-2): 1;
(2) in the nano material suspension obtaining to step (1), add porous mineral, stir; Nanometer CaCO in described porous mineral and step (1)
3and nanometer Ag
2o/TiO
2the ratio of gross weight be (1-10): 1;
(3) product Separation of Solid and Liquid step (2) being obtained, gained solid is through water or ethanol washing, dry, to obtain final product.
6. the preparation method of the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 5, it is characterized in that the nanometer Ag that step (1) is described
2o/TiO
2in, nanometer Ag
2o and nano-TiO
2weight ratio be (0.1-1): 1.
7. the preparation method of the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 5, it is characterized in that the mode of the Separation of Solid and Liquid described in step (3) is for filtering or centrifugation; Described is dried as common dry or vacuum drying or infra-red drying, and baking temperature is 60-120 ℃.
8. the preparation method of the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 5, it is characterized in that step (3) continues following steps afterwards:
(4) the dry product surface obtaining of step (3) is sprayed to silane coupler or silane coupler solution; The use amount of silane coupler is the 0.5-3% of the dry product weight obtaining of step (3); The composite spraying after silane coupler stirs 10-60 minute, 60-120 ℃ of common dry or vacuum drying or the dry 1-5h of infra-red drying.
9. the preparation method of the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 8, it is characterized in that the weight of described silane coupler solution consists of silane coupler 20%, alcohol 72% and water 8%; Described silane coupler is KH-402, KH-550, KH-560, KH-570, KH-580, KH-590, KH-602, KH-792, KH-171 or KH-151.
10. the preparation method of the visible light catalytic composite of pavement automobile exhaust is decomposed in absorption according to claim 9, it is characterized in that in the time that described silane coupler is Ethoxysilane, and described alcohol is ethanol; In the time that described silane coupler is methoxy silane, described alcohol is methyl alcohol; When silane beyond described silane coupler is Ethoxysilane and methoxy silane, described alcohol is isopropyl alcohol; Described silane coupler is except amino silane, and other silane couplers add vinegar acid for adjusting pH value 4-5.
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| CN107185407A (en) * | 2017-07-21 | 2017-09-22 | 江苏燕宁新材料科技发展有限公司 | A kind of tail gas degradation-type thin overlay |
| CN108442202A (en) * | 2018-03-21 | 2018-08-24 | 江苏中路工程检测有限公司 | A kind of antiskid depositing dust subtracts haze pavement structure |
| CN110436829A (en) * | 2019-08-21 | 2019-11-12 | 南京林业大学 | The preparation method of catalytic degradation type Open grade friction course asphalt |
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| CN110436829A (en) * | 2019-08-21 | 2019-11-12 | 南京林业大学 | The preparation method of catalytic degradation type Open grade friction course asphalt |
| CN113912322A (en) * | 2021-10-21 | 2022-01-11 | 杭州构建新型材料有限公司 | Early-strength crystal nucleus type polycarboxylate superplasticizer and production method thereof |
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