A kind of photocatalytic degradation composite particle and its preparation method and application
Technical field
The present invention relates to a kind of photocatalytic degradation composite particle for pavement automobile exhaust degrading and its preparation method and application, belong to the automobile exhaust degrading technical field of city asphalt roads.
Background technology
Along with industrialization and urbanization sustained and rapid development, automobile (containing low-speed cars) recoverable amount increases severely, and the year two thousand twenty will reach 13,103 ten thousand automobiles.Automobile, while raising people's living standard, also brings a large amount of motor vehicle exhaust emissions to city.Motor vehicle exhaust emission is one of important sources becoming urban atmospheric pollution, and some metropolitan atmosphere pollution gradually by coal smoke type car of turning direction tail gas pollution type, or become and have the two comprehensive contamination characteristics.In city, traditional coal-smoke pollution is not yet controlled, and the compound atmosphere pollution that vehicle exhaust brings but becomes increasingly conspicuous.A large amount of nitrogen oxide and volatile organic matter cause the secondary pollutions such as fine particle in city, ozone, acid rain in aggravating situation.The loss caused thus accounts for 5% of China GDP, and automobile exhaust pollution is administered very urgent.
Automobile exhaust pollution problem in current city, mainly takes measures to control from aspects such as " Che-Lu ".Set about from car, efficient automobile tail gas clean-up technology, lifting vehicle discharge control level reduces the major measure of tail gas pollution at present, but also occurred the insoluble problems such as catalytic conversion, catalyst failure, cost.Set about from road, TiO
2load method is effective method the most.TiO
2by pitch (patent 03131764.2), binding agent (patent 200710144762.9) load on road surface.TiO
2be used for road surface by modified pitch mode, not only consumption is many, and TiO
2wrapped up by dark asphalt, the disposal efficiency can not get effective raising.Patent (CN101703889B) proposes shoddy load TiO
2method, patent (201110215822.8) proposes shoddy loaded Ag-TiO
2method, by means of the specific area that rubber powder is large, TiO
2photocatalytic degradation efficiency be greatly improved.These patented technologies improve TiO
2light contact area, improves degradation efficiency.Though but rubber powder has large surface area, do not have porous, adsorptivity is weak, can't the tail gas of active adsorpting aggregation on road surface.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of tail gas, the increase TiO that initiatively can adsorb upper pavement surface
2light absorption area, the photocatalytic degradation composite particle that improve road surface photocatalysis efficiency and its preparation method and application.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of photocatalytic degradation composite particle, is characterized in that, comprise following component: nano-scale anatase TiO
2, micrometer level porous material diatomite and dispersion soln, described dispersion soln is the mixture of coupling agent and industrial alcohol, wherein, described nano-scale anatase TiO
2, micrometer level porous material diatomite, coupling agent and industrial alcohol mass ratio be: 1:2 ~ 6:0.1 ~ 0.3:2 ~ 4.
Further, the described diatomaceous particle diameter of micrometer level porous material is 30 ~ 150 μm, and described nano-scale anatase TiO
2particle diameter be 15 ~ 100nm.
Described coupling agent is any one in silane coupler gamma-aminopropyl-triethoxy-silane, γ-glycydoxy trimethoxy silane, titanate coupling agent 102.
A preparation method for photocatalytic degradation composite particle, is characterized in that, comprises the following steps:
A, by nano-scale anatase TiO
2put into after 110 DEG C of baking ovens toast 12h and seal up for safekeeping;
B, by micrometer level porous material diatomite surface clear water or Ultrasonic Cleaning 30min, then with far infrared drying oven 110 DEG C baking 12h after seal up for safekeeping;
C, by dry after nano-scale anatase TiO
2be that 1:2 ~ 6 are put into mixer and disperseed with micrometer level porous material diatomite according to mass ratio, mixing speed 2000rpm, mixing time is 40 ~ 60min;
D, will with nano-scale anatase TiO
2mass ratio be respectively the industrial alcohol mixing of the coupling agent of 1:0.1-0.3 and 1:2-4 after be configured to dispersion soln, the nano-scale anatase TiO simultaneously dispersion soln and step c prepared
2add together with the diatomaceous mixture of micrometer level porous material in the there-necked flask with condenser pipe and add thermal agitation, and carry out Distillation recovery, be then heated to 80 DEG C of insulation 12h, obtain photocatalytic degradation composite particle.
A kind of photocatalytic degradation composite particle by being sprayed on hot black top road surface, or is attached to road surface by emulsified bitumen slurry cover method, or is sprayed at road surface as road paint composition.
And the consumption of described photocatalytic degradation composite particle is 0.15g ~ 0.25g/ ㎡.
The invention has the beneficial effects as follows: diatomite of the present invention has the features such as specific area is large, porosity is large, absorbability is strong, raising adhesive force, by diatomaceous porous network structure and high-specific surface area characteristic, the tail gas of upper pavement surface can not only be adsorbed positively, can also TiO be made
2particle absorbs light at three dimensions, and increase light absorption area, its absorbing synergic effect significantly enhances the degraded of composite particles road pavement vehicle exhaust; Diatomaceous surface has strong polar bond simultaneously, is easy to and selected action of coupling agents, to TiO
2cohesive force strong, difficult drop-off.By photocatalytic degradation composite particle (TiO
2/ diatomite degraded composite particles) preparation, increase tail gas absorption, improve the absorption area of light, improve the catalytic efficiency of light, realize the effective degraded to urban road tail gas, reduce tail gas pollution to the destruction of environment.
Detailed description of the invention
Below in conjunction with detailed description of the invention, concrete introduction is carried out to the present invention.
Embodiment 1
By mass, by 20 parts of nano-scale anatase TiO
2put into after 110 DEG C of baking ovens toast 12h and seal up for safekeeping, 40 parts of micrometer level porous material diatomite surface clear water are rinsed, seal up for safekeeping after 110 DEG C of baking 12h with far infrared drying oven.By the nano-scale anatase TiO after oven dry
2with micrometer level porous material diatomite in mass ratio 1:2 put into mixer and disperse, mixing speed 2000rpm, mixing time is 40min; 2 parts of silane coupler gamma-aminopropyl-triethoxy-silanes and 40 parts of industrial alcohols are configured to dispersion soln, with the nano-scale anatase TiO after dispersion
2, micrometer level porous material diatomite adds thermal agitation, Distillation recovery in adding with condenser pipe there-necked flask together, is then heated to 80 DEG C of insulation 12h, obtained photocatalytic degradation composite particle (TiO
2/ diatomite degraded composite particles.
Embodiment 2
By mass, by 20 parts of nano-scale anatase TiO
2put into after 110 DEG C of baking ovens toast 12h and seal up for safekeeping, 100 parts of micrometer level porous material diatomite surface clear water are rinsed, seal up for safekeeping after 110 DEG C of baking 12h with far infrared drying oven.By the nano-scale anatase TiO after oven dry
2with micrometer level porous material diatomite in mass ratio 1:2 put into mixer and disperse, mixing speed 2000rpm, mixing time is 60min; 5 parts of silane coupler γ-glycydoxy trimethoxy silanes and 60 parts of industrial alcohols are configured to dispersion soln, with the nano-scale anatase TiO after dispersion
2, micrometer level porous material diatomite adds thermal agitation, Distillation recovery in adding with condenser pipe there-necked flask together, is then heated to 80 DEG C of insulation 12h, obtained photocatalytic degradation composite particle (TiO
2/ diatomite degraded composite particles).
Embodiment 3
By mass, by 20 parts of nano-scale anatase TiO
2put into after 110 DEG C of baking ovens toast 12h and seal up for safekeeping, by 60 parts of micrometer level porous material diatomite surface Ultrasonic Cleaning 30min, seal up for safekeeping after 110 DEG C of baking 12h with far infrared drying oven.By the nano-scale anatase TiO after oven dry
2with micrometer level porous material diatomite in mass ratio 1:3 put into mixer and disperse, mixing speed 2000rpm, mixing time is 60min; 4 parts of titanate coupling agents 102 and 50 parts of industrial alcohols are configured to dispersion soln, with the nano-scale anatase TiO after dispersion
2, micrometer level porous material diatomite adds thermal agitation, Distillation recovery in adding with condenser pipe there-necked flask together, is then heated to 80 DEG C of insulation 12h, obtained photocatalytic degradation composite particle (TiO
2/ diatomite degraded composite particles).
Embodiment 4
The catalytic degradation efficiency research of composite particles:
Make rut plate test coupon by the rolling legal system of T0703-1993 in " highway engineering pitch and Asphalt Mixture Experiment code ", grating is AC-13C, and sample dimensions is 30cm × 6cm × 5cm.Test specimen is cut into 30cm × 6cm × 5cm(long × wide × high) bar shaped test specimen.The composite particles of preparation in embodiment 1,2 and 3 is sent forth on the rut plate of the AC-13C scribbling emulsified asphalt by 0.2g/ ㎡, after solidification, under rut plate being placed on xenon lamp, carries out tail gas degradation experiment.Due to the NO in tail gas
xbe converted mainly into NO
2, and its toxicity is the strongest, thus in an experiment with NO
2as the catalytic degradation efficiency of the tail gas of object gas checking coating.
Use NO in gas detecting and alarming instrument (BX80) detection reaction case
2concentration, record 60min in NO
2change in concentration situation, and to contrast with initial concentration, converse NO
2degradation efficiency.In reaction, temperature and humidity is controlled in conjunction with warming and humidifying device by Hygrothermograph respectively.Initial NO
2concentration: 20ppm, temperature 18 DEG C, humidity 55%, illumination is 3000lx.The NO of degraded vehicle exhaust
2concentration is as shown in table 1 over time.
The NO of table 1 vehicle exhaust
2degradation rate (%) over time
Description of test: when degradation time is after 50min, the NO in three examples
2degraded substantially terminate, degradation rate more than 84%, the NO of system
2major part is degraded.This shows that this composite particles has good NO
2degradation rate, pavement automobile exhaust of can effectively degrading.
The present invention is illustrated according to above-described embodiment, should be appreciated that above-described embodiment does not limit the present invention in any form, and all employings are equal to replacement or the technical scheme that obtains of equivalent transformation mode, all drop within protection scope of the present invention.