CN102153318A - Method for preparing photo-catalytic cement-based material and method for preparing photocatalyst - Google Patents
Method for preparing photo-catalytic cement-based material and method for preparing photocatalyst Download PDFInfo
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- CN102153318A CN102153318A CN2010105840229A CN201010584022A CN102153318A CN 102153318 A CN102153318 A CN 102153318A CN 2010105840229 A CN2010105840229 A CN 2010105840229A CN 201010584022 A CN201010584022 A CN 201010584022A CN 102153318 A CN102153318 A CN 102153318A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
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Abstract
The embodiment of the invention discloses a method for preparing a photo-catalytic cement-based material and a method for preparing a photocatalyst. The method comprises the steps of mixing nanometer titanium dioxide and coal ash to obtain coal ash loaded nanometer titanium dioxide; compounding an up-conversion material with the coal ash loaded nanometer titanium dioxide; then heating and calcining to obtain a photocatalyst; and mixing the photocatalyst with cement to obtain a photo-catalytic cement-based material. Because a visible light can be converted to an ultraviolet light by the up-conversion material, the up-conversion material is compounded with the nanometer titanium dioxide to increase the photocatalysis efficiency of the photo-catalytic cement-based material. In addition, the specific surface area of the titanium dioxide can be increased by the coal ash so that the TiO2 is preferably dispersed in the cement, and thereby the photocatalysis efficiency of the photo-catalytic cement-based material is increased. Proved by experimental results, the photo-catalytic cement-based material prepared by using the preparation method disclosed by the invention obtains a disintegration rate of more than 80% to substances such as nitric oxide, benzene, formaldehyde and the like.
Description
Technical field
The present invention relates to the photocatalysis technology field, more particularly, relate to a kind of preparation method of photo catalytic cement sill and the preparation method of photocatalyst.
Background technology
Along with The development in society and economy, the pollution condition of environment for human survival is on the rise, for example, motor vehicle exhaust goes out a large amount of harmful organic substances and oxynitride, house decorative material also volatilizes a large amount of harmful organic substances, brought grave danger for people's life and health, therefore, exploitation is efficient, the environment-friendly materials of environmental protection, non-secondary pollution are effective Pollution Control keys.
As a kind of engineering materials commonly used, cement-based material develops to high-performance and multi-functional direction gradually, as heat insulating, high-strength light etc.At present, exploitation had both had good constructing operation, mechanical property and an endurance quality, and the dusty gas in again can the photochemical catalytic oxidation atmosphere, the cement-based material of environmental protection are the focuses of current research.At present, the photo catalytic cement sill is by cement and TiO
2Form a kind of new function material.TiO
2Under the irradiation of UV-light, indoor formaldehyde, toluene, dimethylbenzene etc. thoroughly can be resolved into harmless CO
2And H
2O is oxidized to nitric acid with outdoor oxynitride, has wide practical use aspect environmental purification.
Application number is the preparation method that the Chinese patent literature of 200910154677.X has been reported a kind of cement-based material photoactivation admixture, this method earlier with nano titanium oxide mixed crystal and gac by weight 1: 1～2 batch mixing 1～2h, will obtain nano-photocatalyst material after activated carbon supported and redispersable latex powder, water reducer and polypropylene fibre ratio continuation batch mixing 1～2h by weight 1: 0.2～0.3: 0.04～0.06: 0.04: 0.06.In this method, because the right height of composite efficiency again in light induced electron-hole of the titanium dioxide that adopts, photocatalysis performance is not outstanding; And, because the energy gap broad of titanium dioxide, for example anatase octahedrite is 3.2eV, rutile is 3.0eV, only can absorb the UV-light of sunlight medium wavelength, yet the UV-light in the sunlight only accounts for 3～5%, therefore less than 380nm, solar energy utilization ratio is low, and photocatalytic activity is low under the visible light effect.In addition, this method with gac as carrier, therefore, titanium dioxide in cement-based material easily reunion also can't disperse effectively, and, very easily wrapped up and lose good photocatalysis performance by the hydrated cementitious product.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of preparation method of photo catalytic cement sill and the preparation method of photocatalyst, and photo catalytic cement sill photocatalytic activity under the visible light effect of the present invention's preparation is higher.
The invention provides a kind of preparation method of photo catalytic cement sill, comprising:
Up-conversion is provided;
Nano titanium oxide and flyash are mixed, obtain the nano titanium oxide behind the fly ash loading;
Nano titanium oxide behind described up-conversion and the fly ash loading is compound, obtain mixture, with described mixture heating, calcining, obtain photocatalyst;
With described photocatalyst and cement mixing, obtain the photo catalytic cement sill.
Preferably, described up-conversion is Er
0.01Y
0.99AlO
3
Preferably, described Er
0.01Y
0.99AlO
3Preparation as follows:
With Er
2O
3And Y
2O
3Be dissolved in the nitric acid, under agitation condition, add aluminum nitrate, obtain mixing solutions;
Citric acid is added in the described mixing solutions, and heating obtains colloidal sol;
With described colloidal sol oven dry, grind, obtain powdered material, with described powdered material calcining, obtain Er
0.01Y
0.99AlO
3
Preferably, the mass ratio of described nano titanium oxide and described flyash is 1: 1～3.
Preferably, the mass ratio of the nano titanium oxide behind described up-conversion and the described fly ash loading is 1: 10～20.
Preferably, described nano titanium oxide is an anatase-type nanometer titanium dioxide.
Preferably, the particle diameter of described flyash is more than 300 orders.
The present invention also provides a kind of preparation method of photocatalyst, comprising:
Up-conversion is provided;
Nano titanium oxide and flyash are mixed, obtain the nano titanium oxide behind the fly ash loading;
Nano titanium oxide behind described up-conversion and the fly ash loading is compound, obtain mixture, with described mixture heating, calcining, obtain photocatalyst.
Preferably, described up-conversion prepares as follows:
With Er
2O
3And Y
2O
3Be dissolved in the nitric acid, under agitation condition, add aluminum nitrate, obtain mixing solutions;
Citric acid is added in the described mixing solutions, and heating obtains colloidal sol;
With described colloidal sol oven dry, grind, obtain powdered material, with described powdered material calcining, obtain up-conversion.
Preferably, the mass ratio of described nano titanium oxide and described flyash is 1: 1～3.
Preferably, the mass ratio of the nano titanium oxide behind described up-conversion and the described fly ash loading is 1: 10～20.
From above-mentioned technical scheme as can be seen, the invention provides a kind of preparation method of photo catalytic cement sill and the preparation method of photocatalyst, this method is mixed nano titanium oxide and flyash, obtains the nano titanium oxide behind the fly ash loading; Nano titanium oxide behind up-conversion and the fly ash loading is compound, heat then, calcine, obtain photocatalyst; With described photocatalyst and cement mixing, obtain the photo catalytic cement sill.Because up-conversion can convert visible light to UV-light, and is therefore that up-conversion and nano titanium oxide is compound, improve the photocatalysis efficiency of photo catalytic cement sill.In addition, flyash can improve the specific surface area of titanium dioxide, makes TiO
2Better in cement, disperse, thus the photocatalysis efficiency of raising photo catalytic cement sill.Experimental result shows, the photo catalytic cement sill of the present invention's preparation to the rate of decomposition of materials such as oxynitride, benzene, formaldehyde more than 80%.
Embodiment
Below the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The invention discloses a kind of preparation method of photo catalytic cement sill, comprising:
Up-conversion is provided;
Nano titanium oxide and flyash are mixed, obtain the nano titanium oxide behind the fly ash loading;
Nano titanium oxide behind described up-conversion and the fly ash loading is compound, obtain mixture, with described mixture heating, calcining, obtain photocatalyst;
With described photocatalyst and cement mixing, obtain the photo catalytic cement sill.
Described up-conversion is preferably Er
0.01Y
0.99AlO
3, described Er
0.01Y
0.99AlO
3Preferably, be specially according to nitric acid-methods of citric acid preparation:
With Er
2O
3And Y
2O
3Be dissolved in the nitric acid, under agitation condition, add aluminum nitrate, obtain mixing solutions;
Citric acid is added in the described mixing solutions, and heating obtains colloidal sol;
With described colloidal sol oven dry, grind, obtain powdered material, with described powdered material calcining, obtain Er
0.01Y
0.99AlO
3
Described citric acid is preferably solid citric acid, and described citric acid is 3: 1 with the ratio of Er, Y, Al ionic mole total amount.The described temperature that obtains colloidal sol is preferably 80～90 ℃, more preferably 85 ℃.There is no particular restriction to the mode of described heating in the present invention, is preferably heating in water bath.Described colloidal sol is material light yellow and that have viscosity.Described temperature with the colloidal sol oven dry is preferably 110～150 ℃, and more preferably 130 ℃, the time of described oven dry is 20～30 hours, more preferably 24 hours.Described powdered material incinerating temperature is preferably 1000～1500 ℃, more preferably 1200 ℃, the described incinerating time is preferably 1～5 hour, more preferably 2～4 hours, most preferably is 2 hours.
The present invention preferably adopts anatase-type nanometer titanium dioxide.The particle diameter of described flyash is preferably more than 300 orders, and more preferably 300～500 orders most preferably are 300～400 orders.According to the present invention, the mass ratio of described nano titanium oxide and described flyash is preferably 1: 1～and 3, more preferably 1: 2～3, most preferably be 1: 2.Described nano titanium oxide and flyash blended time are preferably 1～5 hour, more preferably 2～4 hours, most preferably are 2 hours.The mass ratio of the nano titanium oxide behind described up-conversion and the described fly ash loading is preferably 1: 10～and 20, more preferably 1: 12～18, most preferably be 1: 15.The described calcining temperature that obtains photocatalyst is preferably 500～600 ℃, more preferably 550 ℃.
TiO
2Under the irradiation of UV-light can with indoor formaldehyde, toluene, dimethylbenzene, etc. thoroughly resolve into harmless CO
2And H
2O is oxidized to nitric acid with outdoor oxynitride, has wide practical use aspect environmental purification.Up-conversion can convert light to UV-light, thereby improves TiO
2Photocatalysis efficiency.In addition, in the prior art with gac as carrier, be unfavorable for the flowing property and the mechanical property of photo catalytic cement sill, therefore, the present invention is carrier loaded TiO with flyash
2And up-conversion, the specific surface area of raising titanium dioxide makes TiO
2Better in cement, disperse, thus the photocatalysis efficiency of raising photo catalytic cement sill.
The present invention also provides a kind of preparation method of photocatalyst, comprising:
Up-conversion is provided;
Nano titanium oxide and flyash are mixed, obtain the nano titanium oxide behind the fly ash loading;
Nano titanium oxide behind described up-conversion and the fly ash loading is compound, obtain mixture, with described mixture heating, calcining, obtain photocatalyst.
Described up-conversion is preferably Er
0.01Y
0.99AlO
3, described Er
0.01Y
0.99AlO
3Preferably, be specially according to nitric acid-methods of citric acid preparation:
With Er
2O
3And Y
2O
3Be dissolved in the nitric acid, under agitation condition, add aluminum nitrate, obtain mixing solutions;
Citric acid is added in the described mixing solutions, and heating obtains colloidal sol;
With described colloidal sol oven dry, grind, obtain powdered material, with described powdered material calcining, obtain Er
0.01Y
0.99AlO
3
Described citric acid is preferably solid citric acid, and described citric acid is 3: 1 with the ratio of Er, Y, Al ionic mole total amount.The described temperature that obtains colloidal sol is preferably 80～90 ℃, more preferably 85 ℃.There is no particular restriction to the mode of described heating in the present invention, is preferably heating in water bath.Described colloidal sol is material light yellow and that have viscosity.Described temperature with the colloidal sol oven dry is preferably 110～150 ℃, and more preferably 130 ℃, the time of described oven dry is 20～30 hours, more preferably 24 hours.Described powdered material incinerating temperature is preferably 1000～1500 ℃, more preferably 1200 ℃, the described incinerating time is preferably 1～5 hour, more preferably 2～4 hours, most preferably is 2 hours.
The present invention preferably adopts anatase-type nanometer titanium dioxide.The particle diameter of described flyash is preferably more than 300 orders, and more preferably 300～500 orders most preferably are 300～400 orders.According to the present invention, the mass ratio of described nano titanium oxide and described flyash is preferably 1: 1～and 3, more preferably 1: 2～3, most preferably be 1: 2.Described nano titanium oxide and flyash blended time are preferably 1～5 hour, more preferably 2～4 hours, most preferably are 2 hours.The mass ratio of the nano titanium oxide behind described up-conversion and the described fly ash loading is preferably 1: 10～and 20, more preferably 1: 12～18, most preferably be 1: 15.The described calcining temperature that obtains photocatalyst is preferably 500～600 ℃, more preferably 550 ℃.
The invention provides a kind of preparation method of photo catalytic cement sill and the preparation method of photocatalyst, this method is mixed nano titanium oxide and flyash, obtains the nano titanium oxide behind the fly ash loading; Nano titanium oxide behind up-conversion and the fly ash loading is compound, heat then, calcine, obtain photocatalyst; With described photocatalyst and cement mixing, obtain the photo catalytic cement sill.Because up-conversion can convert visible light to UV-light, and is therefore that up-conversion and nano titanium oxide is compound, improve the photocatalysis efficiency of photo catalytic cement sill.In addition, flyash can improve the specific surface area of titanium dioxide, makes TiO
2Better in cement, disperse, thus the photocatalysis efficiency of raising photo catalytic cement sill.
In order to further specify technical scheme of the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, but should be appreciated that these describe just to further specifying the features and advantages of the present invention, rather than to the restriction of claim of the present invention.
Embodiment 1
With 0.19g purity is the Er of 99.99wt%
2O
3With 10.39g purity be the Y of 99.99wt%
2O
3Be dissolved in the 12.6ml nitric acid, obtain yttrium nitrate solution and Erbium trinitrate solution, under agitation condition, aluminum nitrate solution is mixed with yttrium nitrate solution, Erbium trinitrate solution, obtain mixing solutions;
Solid citric acid is joined in the described mixing solutions, and wherein, Citrate trianion and Er, Y and the total mol ratio of Al ionic are 3: 1, evaporate in 85 ℃ of water-baths then, colloidal sol lurid up to producing, viscosity;
Described colloidal sol is dried 24h in 130 ℃ baking oven,,, obtain Er the 1200 ℃ of calcinations two hours in tube furnace of the powder after grinding then with its grinding powder
0.01Y
0.99AlO
3
With anatase-type nanometer titanium dioxide and particle diameter is that 300 purpose flyash mixed 2 hours by mass ratio at 1: 2, obtains the nano titanium oxide behind the fly ash loading;
Adopt ultrasonic method with described Er
0.01Y
0.99AlO
3Compound with nano titanium oxide after the described load with mass ratio 1: 15, obtain mixture, be put into the mixture that obtains in the crucible and put into retort furnace and heat, be placed on 100 ℃ of dry 24h then, be placed on the 550 ℃ of calcinings 50 minutes that heat up in the retort furnace after the grinding, obtain photocatalyst;
With described photocatalyst and silicate cement, water, sand, stone with mass ratio 1: 10: 3: mix at 8: 15, obtain the photo catalytic cement sill, normal curing after 12 days gas did 2 days.
Under irradiation of sunlight, when content of nitrogen dioxide was 25ppm, light application time was 2 hours with described photo catalytic cement sill, and the rate of decomposition of oxynitride in the vehicle exhaust is reached more than 80%.
Embodiment 2
Adopt the method among the embodiment 1 to prepare Er
0.01Y
0.99AlO
3
With anatase-type nanometer titanium dioxide and particle diameter is that 320 purpose flyash mixed 2 hours by mass ratio at 1: 2, obtains the nano titanium oxide behind the fly ash loading;
Adopt ultrasonic method with described Er
0.01Y
0.99AlO
3Compound with titanium dioxide after the load with mass ratio 1: 15, obtain mixture, be put into the mixture that obtains in the crucible and put into retort furnace and heat, be placed on 100 ℃ of dry 24h then after, be placed on the 550 ℃ of calcinings 50 minutes that heat up in the retort furnace after the grinding, obtain photocatalyst;
With described photocatalyst and silicate cement, water, sand, stone with mass ratio 1: 10: 3: mix at 8: 15, make the photo catalytic cement sill, normal curing after 12 days gas did 2 days.
Under irradiation of sunlight, when the concentration of benzene was 10mg/L in trade effluent, irradiation time was 2 hours with described photo catalytic cement sill, and the degradation rate of benzene is reached more than 80%.
Embodiment 3
Adopt the method among the embodiment 1 to prepare Er
0.01Y
0.99AlO
3
With anatase-type nanometer titanium dioxide and particle diameter is 310 purpose flyash by 1: 3 thorough mixing of mass ratio 2 hours, obtains the nano titanium oxide behind the fly ash loading;
Adopt ultrasonic method with described Er
0.01Y
0.99AlO
3Fully compound with titanium dioxide after the described load with mass ratio 1: 10, obtain mixture, be put into the mixture that obtains in the crucible and put into retort furnace and heat, be placed on 100 ℃ of dry 24h then after, be placed on the 550 ℃ of calcinings 50 minutes that heat up in the retort furnace after the grinding, obtain photocatalyst;
With described photocatalyst and silicate white cement, water, coating with mass ratio 1: 20: 3: 8: mix, make the photo catalytic cement sill, normal curing 18 days.
Described photo catalytic cement sill under the irradiation of indoor light, is constantly fed formaldehyde, compare with scratch brushing catalysis cement not, organic rate of decomposition such as indoor formaldehyde, benzene improves more than 85%.
Embodiment 4
Adopt the method among the embodiment 1 to prepare Er
0.01Y
0.99AlO
3
Anatase-type nanometer titanium dioxide and flyash are pressed 1: 2 thorough mixing of mass ratio 2 hours, obtain the nano titanium oxide behind the fly ash loading;
Adopt ultrasonic method with described Er
0.01Y
0.99AlO
3Compound with titanium dioxide after the described load with mass ratio 1: 10, be put into the mixture that obtains in the crucible and put into retort furnace and heat, after being placed on 100 ℃ of dry 24h then, be placed on the 550 ℃ of calcinings 50 minutes that heat up in the retort furnace after the grinding, obtain photocatalyst;
With described photocatalyst and silicate white cement, water, coating with mass ratio 1: 20: 3: 8: mix, make the photo catalytic cement sill, normal curing 18 days.
Described photo catalytic cement sill under the irradiation of indoor light, is constantly fed formaldehyde, compare with scratch brushing catalysis cement not, organic rate of decomposition such as indoor formaldehyde, benzene improves more than 80%
From the foregoing description as can be seen, more than 80%, therefore, photo catalytic cement sill photocatalytic activity under the visible light effect of the present invention's preparation is higher to the rate of decomposition of materials such as oxynitride, benzene, formaldehyde for the photo catalytic cement sill of the present invention preparation.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (11)
1. the preparation method of a photo catalytic cement sill is characterized in that, comprising:
Up-conversion is provided;
Nano titanium oxide and flyash are mixed, obtain the nano titanium oxide behind the fly ash loading;
Nano titanium oxide behind described up-conversion and the fly ash loading is compound, obtain mixture, with described mixture heating, calcining, obtain photocatalyst;
With described photocatalyst and cement mixing, obtain the photo catalytic cement sill.
2. preparation method according to claim 1 is characterized in that, described up-conversion is Er
0.01Y
0.99AlO
3
3. preparation method according to claim 2 is characterized in that, described Er
0.01Y
0.99AlO
3Preparation as follows:
With Er
2O
3And Y
2O
3Be dissolved in the nitric acid, under agitation condition, add aluminum nitrate, obtain mixing solutions;
Citric acid is added in the described mixing solutions, and heating obtains colloidal sol;
With described colloidal sol oven dry, grind, obtain powdered material, with described powdered material calcining, obtain Er
0.01Y
0.99AlO
3
4. preparation method according to claim 1 is characterized in that, the mass ratio of described nano titanium oxide and described flyash is 1: 1～3.
5. preparation method according to claim 1 is characterized in that, the mass ratio of the nano titanium oxide behind described up-conversion and the described fly ash loading is 1: 10～20.
6. preparation method according to claim 1 is characterized in that, described nano titanium oxide is an anatase-type nanometer titanium dioxide.
7. preparation method according to claim 1 is characterized in that, the particle diameter of described flyash is more than 300 orders.
8. the preparation method of a photocatalyst is characterized in that, comprising:
Up-conversion is provided;
Nano titanium oxide and flyash are mixed, obtain the nano titanium oxide behind the fly ash loading;
Nano titanium oxide behind described up-conversion and the fly ash loading is compound, obtain mixture, with described mixture heating, calcining, obtain photocatalyst.
9. preparation method according to claim 8 is characterized in that, described up-conversion prepares as follows:
With Er
2O
3And Y
2O
3Be dissolved in the nitric acid, under agitation condition, add aluminum nitrate, obtain mixing solutions;
Citric acid is added in the described mixing solutions, and heating obtains colloidal sol;
With described colloidal sol oven dry, grind, obtain powdered material, with described powdered material calcining, obtain up-conversion.
10. preparation method according to claim 8 is characterized in that, the mass ratio of described nano titanium oxide and described flyash is 1: 1～3.
11. preparation method according to claim 8 is characterized in that, the mass ratio of the nano titanium oxide behind described up-conversion and the described fly ash loading is 1: 10～20.
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