CN111875310A - Photocatalytic cement-based material - Google Patents
Photocatalytic cement-based material Download PDFInfo
- Publication number
- CN111875310A CN111875310A CN202010632767.1A CN202010632767A CN111875310A CN 111875310 A CN111875310 A CN 111875310A CN 202010632767 A CN202010632767 A CN 202010632767A CN 111875310 A CN111875310 A CN 111875310A
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- Prior art keywords
- cement
- based material
- montmorillonite
- photocatalyst
- photocatalytic
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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
- C04B28/04—Portland cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2061—Materials containing photocatalysts, e.g. TiO2, for avoiding staining by air pollutants or the like
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
Abstract
The invention provides a photocatalytic cement-based material, which is prepared by mixing cement, a photocatalyst, a dispersant and water according to the mass ratio of 1: 0.005-0.08: 0.001: 0.35; the photocatalyst is obtained by carrying butyl titanate after pillared agent modified layered aluminosilicate, and then carrying out in-situ hydrolysis and calcination. The photocatalyst is added into the cement and compounded with the dispersant, so that the photocatalyst can be uniformly dispersed in the cement, the photocatalytic effect of the cement is effectively improved, the cationic pillared agent is adopted to pillared layered aluminosilicate to enlarge the interlayer region of the aluminosilicate, then butyl titanate is introduced between the layers, and the photocatalyst is obtained by in-situ hydrolysis and calcination, so that the uniform distribution of titanium dioxide between the layers can be realized, the problem that titanium dioxide particles are easy to agglomerate and deactivate is solved, and when the photocatalyst is used for preparing a photocatalytic cement-based material, the photocatalytic effect of the prepared photocatalytic cement-based material can be further improved, and the problem of air pollution is effectively solved.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a photocatalytic cement-based material.
Background
With the rapid development of the industrial level, the environmental pollution problem becomes more serious, especially air pollution, automobile exhaust, industrial waste gas and the like are harmful to health, researches show that air pollution is easy to induce serious diseases such as cancer, and the air pollution is formally classified as one of cancerogens, and the harm degree of the cancerogenous matters exceeds 100 other known cancerogenous matters such as plutonium, ultraviolet radiation, tobacco smoke and the like. In view of the estimation of disease cost, the loss caused by environmental problems accounts for 1.2% of the total domestic production per year economic loss, and under the background that the current society emphasizes strong environmental pollution treatment and environment protection marketization mechanism establishment, the research on how to prevent and treat environmental pollution, protect environment and improve human living environment and reduce the occurrence probability of various diseases becomes an inevitable problem for people in all countries around the world.
The cement-based material is used as the most widely applied building material at present, such as roads, bridges, building outer walls and roofs, venues, outdoor decorations and the like, and is exposed to light for a long time, so that the titanium dioxide photocatalyst is used in the cement-based material to prepare the photocatalytic cement-based material, and the photocatalytic cement-based material has important practical significance for reducing urban air pollution. At present, the research on the photocatalytic cement-based material is mainly to add titanium dioxide powder in the process of mixing the cement-based material or add the titanium dioxide powder after ultrasonic dispersion, but the method is not easy to solve the problems of uniform dispersion and agglomeration of the titanium dioxide in the cement-based material. The research also shows that the photocatalysis machine is directly coated on the surface of the cement-loaded mortar to improve the photocatalysis efficiency to the maximum extent, but the method needs to bond titanium dioxide and materials to the surface, has complex process and higher cost and is easy to cause secondary pollution.
Disclosure of Invention
In view of the above, the present invention provides a photocatalytic cement-based material, so as to solve the problem of poor photocatalytic effect of the existing photocatalytic cement-based material.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a photocatalytic cement-based material is prepared by mixing cement, a photocatalyst, a dispersing agent and water according to the mass ratio of 1: 0.005-0.08: 0.001: 0.35; the photocatalyst is obtained by carrying butyl titanate after pillared agent modified layered aluminosilicate, and then carrying out in-situ hydrolysis and calcination.
Optionally, the photocatalyst is a photocatalyst prepared by the following method:
adding a pillaring agent into the montmorillonite suspension with a certain mass fraction to carry out a montmorillonite pillaring reaction, and after the montmorillonite pillaring reaction is finished, filtering and drying to obtain pillared montmorillonite;
and mixing the pillared montmorillonite, absolute ethyl alcohol and butyl titanate, carrying out in-situ hydrolysis reaction, filtering and drying after the in-situ hydrolysis reaction is finished, and then calcining to obtain the photocatalyst.
Optionally, the mass fraction of the smectite suspension is 10%; the montmorillonite in the montmorillonite suspension is natural montmorillonite, and the cation exchange capacity of the montmorillonite is 90-120 mmol/100 g.
Optionally, the pillaring agent is cetyltrimethylammonium bromide, or cetyltrimethylammonium chloride.
Optionally, the pillaring agent is added in an amount of 15-40% of the mass of montmorillonite in the montmorillonite suspension.
Optionally, the reaction temperature of the montmorillonite pillared reaction is 60 ℃ and the reaction time is 2 h.
Optionally, the mass ratio of the pillared montmorillonite to the absolute ethyl alcohol to the butyl titanate is 1: 10: 2.
Optionally, the reaction time of the in-situ hydrolysis reaction is 3 hours; the calcination temperature is 400-800 ℃, and the calcination time is 2 h.
Optionally, the photocatalyst has a light intensity of 0.523mW/cm in ultraviolet light2When the irradiation is carried out for 120min, the degradation rate of the methylene blue of 20mg/L is more than 90 percent.
Optionally, the dispersant is a mixture of polymeric ferric sulfate and sodium thiosulfate; the mass ratio of the polymeric ferric sulfate to the sodium thiosulfate is 1: 1-2; the cement is ordinary portland cement.
Compared with the prior art, the photocatalytic cement-based material has the following advantages:
1. the photocatalyst is added into the cement and compounded with the dispersant, so that the photocatalyst can be uniformly dispersed in the cement, the photocatalytic effect of the cement is effectively improved, the cationic pillared agent is adopted to pillared layered aluminosilicate to enlarge the interlayer region of the aluminosilicate, then butyl titanate is introduced between the layers, and the photocatalyst is obtained by in-situ hydrolysis and calcination, so that the uniform distribution of titanium dioxide between the layers can be realized, the problem that titanium dioxide particles are easy to agglomerate and deactivate is solved, and when the photocatalyst is used for preparing a photocatalytic cement-based material, the photocatalytic effect of the prepared photocatalytic cement-based material can be further improved, and the problem of air pollution is effectively solved.
2. The photocatalytic cement-based material disclosed by the invention is simple in preparation process, and all the raw materials are simply mixed, so that the photocatalytic cement-based material has lower preparation cost and cannot cause secondary pollution.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to examples.
The raw material ratios of the photocatalytic cement-based materials of embodiments 1 to 6 of the present invention are shown in table 1, and the photocatalytic cement-based materials of embodiments 1 to 6 of the present invention are obtained by mixing and stirring the raw materials uniformly according to the raw material ratios shown in table 1. Wherein, the water cement ratio in table 1 is the ratio of the water usage to the cement usage in the photocatalytic cement-based material, for example, when the cement usage is 100g, the water cement ratio is 0.35, and the water usage is 35 g.
The photocatalyst in the photocatalytic cement-based material in the embodiment 1-6 is prepared by the following method:
selecting natural montmorillonite with cation exchange capacity of 90mmol/100g to prepare montmorillonite suspension with mass fraction of 10%;
adding hexadecyl trimethyl ammonium bromide into the montmorillonite suspension to serve as a pillared agent, wherein the addition amount of the hexadecyl trimethyl ammonium bromide is 15% of the mass of the montmorillonite in the montmorillonite suspension, stirring for 2 hours at 60 ℃ to perform montmorillonite pillared reaction, and filtering and drying after the montmorillonite pillared reaction is finished to obtain pillared montmorillonite;
mixing the pillared montmorillonite, absolute ethyl alcohol and butyl titanate according to the mass ratio of 1: 10: 2, stirring for 3 hours, carrying out in-situ hydrolysis reaction, and after the in-situ hydrolysis reaction is finishedThen filtering, drying, and calcining for 2h at 600 ℃ to obtain the photocatalyst, wherein the light intensity of the obtained photocatalyst in ultraviolet light is 0.523mW/cm2When the irradiation is carried out for 120min, the degradation rate of the methylene blue of 20mg/L is more than 90 percent.
The photocatalytic effect of the photocatalytic cement-based material according to embodiments 1 to 6 of the present invention is shown in table 2.
As can be seen from Table 2, when the photocatalyst of the present invention is not added (comparative example), the obtained cement-based material has no degradation effect on methylene blue, and with the addition of the photocatalyst, the photocatalytic degradation rate of the photocatalytic cement-based material of examples 1-6 of the present invention reaches more than 90% after being illuminated for 120 min.
TABLE 1
TABLE 2
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A photocatalysis cement-based material is characterized in that the photocatalysis cement-based material is prepared by mixing cement, a photocatalyst, a dispersant and water according to the mass ratio of 1: 0.005-0.08: 0.001: 0.35; the photocatalyst is obtained by carrying butyl titanate after pillared agent modified layered aluminosilicate, and then carrying out in-situ hydrolysis and calcination.
2. The photocatalytic cement-based material as set forth in claim 1, wherein the photocatalyst is a photocatalyst prepared by a method comprising:
adding a pillaring agent into the montmorillonite suspension with a certain mass fraction to carry out a montmorillonite pillaring reaction, and after the montmorillonite pillaring reaction is finished, filtering and drying to obtain pillared montmorillonite;
and mixing the pillared montmorillonite, absolute ethyl alcohol and butyl titanate, carrying out in-situ hydrolysis reaction, filtering and drying after the in-situ hydrolysis reaction is finished, and then calcining to obtain the photocatalyst.
3. The photocatalytic cement-based material according to claim 2, characterized in that the mass fraction of the montmorillonite suspension is 10%; the montmorillonite in the montmorillonite suspension is natural montmorillonite, and the cation exchange capacity of the montmorillonite is 90-120 mmol/100 g.
4. The photocatalytic cement-based material of claim 2, wherein the pillaring agent is cetyltrimethylammonium bromide, or cetyltrimethylammonium chloride.
5. The photocatalytic cement-based material according to claim 2, wherein the pillaring agent is added in an amount of 15-40% by mass of montmorillonite in the montmorillonite suspension.
6. The photocatalytic cement-based material as set forth in claim 2, wherein the reaction temperature of the pillared montmorillonite reaction is 60 ℃ and the reaction time is 2 hours.
7. The photocatalytic cement-based material as set forth in claim 2, wherein the mass ratio of the pillared montmorillonite, the anhydrous ethanol and the butyl titanate is 1: 10: 2.
8. The photocatalytic cement-based material as set forth in claim 2, wherein the reaction time of the in-situ hydrolysis reaction is 3 hours; the calcination temperature is 400-800 ℃, and the calcination time is 2 h.
9. Photocatalytic cement-based material according to any one of claims 1 to 8, characterized in thatThe light intensity of the photocatalyst in ultraviolet light is 0.523mW/cm2When the irradiation is carried out for 120min, the degradation rate of the methylene blue of 20mg/L is more than 90 percent.
10. The photocatalytic cement-based material as set forth in claim 1, wherein the dispersant is a mixture of polymeric ferric sulfate, sodium thiosulfate; the mass ratio of the polymeric ferric sulfate to the sodium thiosulfate is 1: 1-2; the cement is ordinary portland cement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010632767.1A CN111875310A (en) | 2020-07-02 | 2020-07-02 | Photocatalytic cement-based material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010632767.1A CN111875310A (en) | 2020-07-02 | 2020-07-02 | Photocatalytic cement-based material |
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| CN111875310A true CN111875310A (en) | 2020-11-03 |
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| CN202010632767.1A Pending CN111875310A (en) | 2020-07-02 | 2020-07-02 | Photocatalytic cement-based material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443870A (en) * | 2021-06-01 | 2021-09-28 | 武汉理工大学 | Floating plate capable of purifying dye wastewater and preparation method thereof |
| CN115646475A (en) * | 2022-10-08 | 2023-01-31 | 东南大学 | Secondary load type photocatalytic cement-based material and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002201059A (en) * | 2000-12-28 | 2002-07-16 | Shinkichi Osanai | Hydraulic composition for photocatalyst |
| CN106190511A (en) * | 2016-07-05 | 2016-12-07 | 武汉理工大学 | A kind of photocatalysis concrete parting agent and preparation method thereof |
| CN106747105A (en) * | 2016-12-31 | 2017-05-31 | 武汉理工大学 | A kind of photo catalytic cement mortar and preparation method thereof |
| CN106830819A (en) * | 2016-12-29 | 2017-06-13 | 中冶建筑研究总院有限公司 | Cement base molding material and preparation method thereof |
-
2020
- 2020-07-02 CN CN202010632767.1A patent/CN111875310A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002201059A (en) * | 2000-12-28 | 2002-07-16 | Shinkichi Osanai | Hydraulic composition for photocatalyst |
| CN106190511A (en) * | 2016-07-05 | 2016-12-07 | 武汉理工大学 | A kind of photocatalysis concrete parting agent and preparation method thereof |
| CN106830819A (en) * | 2016-12-29 | 2017-06-13 | 中冶建筑研究总院有限公司 | Cement base molding material and preparation method thereof |
| CN106747105A (en) * | 2016-12-31 | 2017-05-31 | 武汉理工大学 | A kind of photo catalytic cement mortar and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443870A (en) * | 2021-06-01 | 2021-09-28 | 武汉理工大学 | Floating plate capable of purifying dye wastewater and preparation method thereof |
| CN113443870B (en) * | 2021-06-01 | 2022-12-09 | 武汉理工大学 | Floating plate capable of purifying dye wastewater and preparation method thereof |
| CN115646475A (en) * | 2022-10-08 | 2023-01-31 | 东南大学 | Secondary load type photocatalytic cement-based material and preparation method thereof |
| CN115646475B (en) * | 2022-10-08 | 2024-04-30 | 东南大学 | Secondary supported photocatalytic cement-based material and preparation method thereof |
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Application publication date: 20201103 |