CN117486553A - Micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and preparation method thereof - Google Patents
Micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and preparation method thereof Download PDFInfo
- Publication number
- CN117486553A CN117486553A CN202311313638.6A CN202311313638A CN117486553A CN 117486553 A CN117486553 A CN 117486553A CN 202311313638 A CN202311313638 A CN 202311313638A CN 117486553 A CN117486553 A CN 117486553A
- Authority
- CN
- China
- Prior art keywords
- micro
- carbon nitride
- phase carbon
- powder
- cement mortar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 230000000593 degrading effect Effects 0.000 title claims abstract description 25
- 239000011083 cement mortar Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims description 9
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 48
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 39
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000010439 graphite Substances 0.000 claims abstract description 35
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 229920003023 plastic Polymers 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000010440 gypsum Substances 0.000 claims abstract description 14
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 14
- 239000010451 perlite Substances 0.000 claims abstract description 14
- 235000019362 perlite Nutrition 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 12
- 239000003245 coal Substances 0.000 claims abstract description 11
- 239000013530 defoamer Substances 0.000 claims abstract description 11
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 10
- 239000011707 mineral Substances 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 6
- 239000012190 activator Substances 0.000 claims abstract description 4
- 239000000084 colloidal system Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000011405 expansive cement Substances 0.000 claims description 14
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical group CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 8
- 239000002135 nanosheet Substances 0.000 claims description 8
- 230000002829 reductive effect Effects 0.000 claims description 8
- -1 fatty acid ester Chemical class 0.000 claims description 7
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000000194 fatty acid Substances 0.000 claims description 6
- 229930195729 fatty acid Natural products 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims description 6
- 229920000877 Melamine resin Polymers 0.000 claims description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 239000004156 Azodicarbonamide Substances 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical group NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 4
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims 1
- 239000003469 silicate cement Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 29
- 230000001699 photocatalysis Effects 0.000 abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000007146 photocatalysis Methods 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 238000012360 testing method Methods 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000004567 concrete Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000011941 photocatalyst Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 229920000223 polyglycerol Polymers 0.000 description 4
- 241000282414 Homo sapiens Species 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- C04B2111/00008—Obtaining or using nanotechnology related materials
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses micro-expansion cement mortar capable of degrading nitrogen oxides under natural light, which comprises the following components in parts by weight: the composite material is prepared by mixing 0.01-0.03 part of amphoteric graphite phase carbon nitride, 0.04-0.08 part of desulfurized gypsum, 0.05-0.1 part of coal gangue powder, 0.1-0.2 part of steel slag powder, 0.001-0.005 part of plastic expanding agent, 0.001-0.005 part of defoamer, 0.001-0.002 part of powder polycarboxylate water reducer, 0.001-0.003 part of mineral activity activator, 0.001-0.005 part of perlite, 0.5-0.7 part of common silicon cement, 2-4 parts of construction sand and 0.4 part of water, wherein the total amount of other components except for water and the construction sand is 1 part. The invention utilizes the high-efficiency photocatalysis performance of the amphoteric graphite phase carbon nitride under visible light to effectively degrade the harmful component nitrogen oxide in the air, thereby playing a positive role in purifying the environment; the micro-expansion performance of the expansion component can reduce the generation of shrinkage cracks of mortar, improve the durability and the aesthetic degree of the material, and simultaneously use a large amount of industrial solid wastes such as desulfurized gypsum, coal gangue, steel slag and the like, thereby being beneficial to recycling resources and reducing environmental pollution.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and a preparation method thereof.
Background
With the acceleration of the progress of human industrialization, the problem of environmental pollution has been one of the biggest challenges facing the current human beings. The nitrogen oxide is used as main harmful component in the atmosphere, and has wide production path, such as oxidation reaction of nitrogen-containing organic matters in various industrial furnaces, chemical raw material production, motor vehicles and fuels, and the like, and the harm is mainly reflected in the aspects of damaging human respiratory system, generating photochemical smog, generating acid rain, destroying ozone layer, and the like. To improve the current situation, scientists are actively looking for various methods to reduce the nitrogen oxide content in the atmosphere.
Cement is used as a basic material in the building industry, has excellent performance, wide application range and huge volume, and plays an irreplaceable role. Shrinkage is an inherent property of cement-based materials, and the root cause of the shrinkage is that cement is reduced in volume after hydration, meanwhile, shrinkage of materials such as drying shrinkage, temperature shrinkage and carbonization shrinkage has important influence on crack generation and development, and the crack generation not only affects the aesthetic property of a building, but also increases erosion of harmful substances to the materials, and greatly reduces the durability of the materials. Researches show that the addition of a proper amount of micro-expansion components into the cement-based material can effectively reduce the generation of material cracks.
The most widely applied photocatalyst in the existing cement-based composite material is a titanium dioxide-based material, and the oxidation-reduction capability of the semiconductor titanium dioxide under the irradiation of sunlight is utilized to degrade or purify pollutants and simultaneously achieve the self-cleaning effect of the building surface, so that the photocatalyst is introduced into the cement-based material to remove harmful nitrogen oxides in the atmosphere, and more people pay attention to the photocatalyst. However, studies have shown that titanium dioxide is only excited by ultraviolet light and cannot effectively utilize visible light and solar energy, so that the search for a more suitable photocatalyst is important to achieve effective removal of atmospheric pollutants.
Graphite phase carbon nitride is used as an open star material in the field of photocatalysis in the century, and is touted by people because of the effective utilization of visible light in sunlight, but the block material has the defects of low specific surface area, high photo-generated electron-hole recombination rate and the like, and the application of the material is greatly limited, so that the photocatalytic performance of the material is improved, and the material is combined with cement-based materials to remove nitrogen oxides in the atmosphere, so that the material is an important measure for improving the living environment of people.
The mortar is a common rigid waterproof material in a concrete structure, and the photocatalytic material is combined with cement mortar to prepare environment-friendly cement mortar, so that the mortar not only can play a role in waterproof, but also can effectively eliminate nitrogen and oxygen compounds in the atmosphere and improve the air environment.
As disclosed in CN 108609930a, a graphite-phase carbon nitride photocatalytic cement mortar is prepared from 1 part of cement, 0.01-0.05 part of graphite-phase carbon nitride, 0.03-0.07 part of polymer, 2-5 parts of building sand and 0.025-0.035 part of additive by mixing, calcining and grinding urea, dicyandiamide and melamine in a weight ratio of 1:1:1:1, and is used in cement mortar with single function and lower photocatalytic efficiency under visible light. For example, CN 115259768A discloses a modified graphite phase carbon nitride type photocatalytic cement mortar, which is prepared by mixing modified graphite phase carbon nitride with cement mortar in a weight ratio of 1-20/1000, wherein the graphite phase carbon nitride is modified by heat treatment, and has lower photocatalytic efficiency.
Therefore, the preparation of the cement mortar which can efficiently degrade nitrogen oxides in the air under natural light and has high crack resistance and good economic benefit is key to the invention.
Disclosure of Invention
The invention aims at solving the problems existing in the prior art and provides micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and a preparation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the micro-expansion cement mortar capable of degrading nitrogen oxides under natural light is characterized by comprising the following components in parts by weight: 0.01-0.03 part of amphoteric graphite phase carbon nitride, 0.04-0.08 part of desulfurized gypsum, 0.05-0.1 part of coal gangue powder, 0.1-0.2 part of steel slag powder, 0.001-0.005 part of plastic expanding agent, 0.001-0.005 part of defoamer, 0.001-0.002 part of powder polycarboxylate water reducer, 0.001-0.003 part of mineral activity activator, 0.001-0.005 part of perlite, 0.5-0.7 part of ordinary Portland cement, 2-4 parts of construction sand and 0.4 part of water, wherein the total amount of other components except water and the construction sand is 1 part.
Further, the preparation method of the amphoteric graphite phase carbon nitride comprises the following steps: the first step: the raw materials are melamine, dicyandiamide or cyanamide, the raw materials are heated to 520 ℃ in a muffle furnace at a speed of 5 ℃/min, the temperature is kept for 240min, and then the temperature is reduced to room temperature in the furnace to obtain blocky graphite-phase carbon nitride, and the blocky graphite-phase carbon nitride is ground into powder for standby.
And a second step of: weighing a certain amount of the obtained graphite-phase carbon nitride, placing the graphite-phase carbon nitride into a 5-15mol/L sulfuric acid solution according to the mass ratio of the graphite-phase carbon nitride to the sulfuric acid solution of 1:5-1:10, stirring for 20-30h under the ultrasonic dispersion condition, and then rotationally separating the obtained mixed system by using a centrifugal separator to obtain a lower-layer precipitate; sequentially washing, dispersing and centrifuging the lower layer precipitate, repeating for several times, and repeatedly collecting the upper layer colloid; and (3) placing the obtained upper colloid in a baking oven at 70-90 ℃ for drying and grinding to obtain the amphoteric graphite phase carbon nitride.
Further, the content of sulfur trioxide in the desulfurized gypsum is 40-43%.
Further, the specific surface area of the coal gangue is 600-700kg/m after the coal gangue is ground by an airflow mill 2 。
Further, the specific surface area of the steel slag is 400-500kg/m after being ground by an air flow mill 2 。
Furthermore, the mineral activity excitant consists of polyacrylamide and polyglycerol fatty acid ester according to the mass ratio of 1:1-1:3.
Further, the main component of the plastic expanding agent is azodicarbonamide, and the bulk density is 400-500kg/m 3 。
Further, the defoamer is propylene glycol block polyether.
Furthermore, the water reducing rate of the powder polycarboxylate superplasticizer is 25-30%.
Further, the perlite has a particle size of 100 mesh.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes the acid modification and ultrasonic treatment stripping technology, combines the technology of regulating and controlling the pH of the colloid to prepare the amphoteric graphite-phase carbon nitride nanosheet colloid, has the maximum thickness of not more than 10nm, and then uses the modified material in the form of powder in micro-expansion cement mortar, compared with the graphite-phase carbon nitride prepared by a bulk material and a single stripping mode, the photocatalysis effect of visible light is obviously improved, and the nitrogen-oxygen compound in the air can be effectively reduced, and the air quality is improved; then, the micro-expansion components, namely coal gangue, desulfurized gypsum and plastic expansion agent azodicarbonamide are combined and introduced, when hydration reaction occurs, a large amount of ettringite crystals can be generated, so that cement stones are expanded, the shrinkage of cement-based materials can be compensated, the cracking risk of mortar is reduced, and meanwhile, the plastic cracking problem of mortar is solved; the mineral activity excitant (the mixture of polyacrylamide and polyglycerin fatty acid ester) is introduced to improve the hydration activity of industrial solid waste, improve the mechanical property of mortar, and improve the compactness of the mortar in cooperation with the defoamer propylene glycol block polyether, so as to further improve the mechanical property; and the water-retaining component, namely perlite powder, is introduced, so that the water can be effectively stored, the self-shrinkage in the mortar is weakened, the drying shrinkage is reduced, the secondary hydration of the cementing material is promoted, the mechanical property of the mortar is improved, and the cracking risk is reduced. The invention adopts a large amount of industrial solid waste steel slag, coal gangue and desulfurized gypsum, which can bring obvious economic benefit while reducing environmental pollution.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
In the following examples, the sulfur trioxide content in the desulfurized gypsum is 40-43%; the gangue powder is obtained by grinding gangue through an air flow mill, and the specific surface area is 600-700kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The steel slag powder is obtained by grinding steel slag through an air flow mill, and the specific surface area is 400-500kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The granularity of the perlite is 100 meshes; the water reducing rate of the powder polycarboxylate superplasticizer is 25-30%; the plastic expanding agent is azodicarbonamide with bulk density of 400-500kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The defoamer is propylene glycol block polyether.
In the following embodiments, the preparation method of the amphoteric graphite phase carbon nitride comprises the following two steps: the first step: melamine is selected as a raw material, the melamine is heated to 520 ℃ in a muffle furnace at a speed of 5 ℃/min, the temperature is kept for 240min, and then the temperature is reduced to room temperature in the furnace to obtain massive graphite phase carbon nitride (the massive graphite phase carbon nitride is also adopted in comparative example 1), and the massive graphite phase carbon nitride is ground into powder for standby;
and a second step of: weighing a certain amount of the graphite phase carbon nitride powder, placing the graphite phase carbon nitride powder into 10mol/L sulfuric acid solution, stirring for 24 hours under the ultrasonic dispersion condition, and then carrying out high-speed rotary separation on the obtained liquid by using a centrifugal separator to obtain lower-layer sediment; sequentially washing, dispersing and centrifuging the lower-layer precipitate, repeatedly collecting the upper-layer colloid, namely the amphoteric graphite phase carbon nitride nanosheet colloid, and collecting the lower-layer precipitate remained after the upper-layer colloid for the comparative example 2; and (3) placing the colloid in an oven at 80 ℃ for drying and grinding to obtain the amphoteric graphite phase carbon nitride powder.
The amphoteric graphite phase carbon nitride nanosheet colloid is proved to have the Tyndall effect by illumination experiments and is colloid; and the thickness of the nano sheet is 5-10 nm and the length is 50-100 nm by AFM (atomic force microscope).
In the following embodiments, the preparation method of the micro-expansive cement mortar capable of degrading nitrogen oxides under natural light comprises the following steps: according to the weight parts of the raw materials of the embodiment, the amphoteric graphite phase carbon nitride, the desulfurized gypsum, the gangue powder, the plastic expansion agent, the defoamer, the steel slag powder, the powder polycarboxylate water reducer, the mineral activity excitant, the perlite, the common silicon cement, the building sand and the water are fully mixed according to the proportion, so that the micro-expansion cement mortar capable of degrading the nitrogen oxide under the natural light is obtained.
Example 1
A micro-expansion cement mortar capable of degrading nitrogen oxides under natural light comprises the following components in parts by weight: the composite material comprises 0.01 part of amphoteric graphite phase carbon nitride powder, 0.05 part of desulfurized gypsum, 0.08 part of coal gangue powder, 0.2 part of steel slag powder, 0.001 part of plastic expanding agent, 0.003 part of defoamer, 0.001 part of powder polycarboxylate water reducer, 0.001 part of polyacrylamide, 0.001 part of polyglycerol fatty acid ester, 0.003 part of perlite, 0.65 part of common silica cement, 2.8 parts of building sand and 0.4 part of water which are uniformly mixed and stirred.
Example 2
A micro-expansion cement mortar capable of degrading nitrogen oxides under natural light comprises the following components in parts by weight: 0.03 part of amphoteric graphite phase carbon nitride powder, 0.05 part of desulfurized gypsum, 0.06 part of coal gangue powder, 0.2 part of steel slag powder, 0.001 part of plastic expanding agent, 0.003 part of defoamer, 0.001 part of powder polycarboxylate water reducer, 0.001 part of polyacrylamide, 0.001 part of polyglycerol fatty acid ester, 0.003 part of perlite, 0.65 part of common silicon cement, 2.8 parts of building sand and 0.4 part of water are mixed and stirred uniformly.
Example 3
A micro-expansion cement mortar capable of degrading nitrogen oxides under natural light comprises the following components in parts by weight: 0.02 part of amphoteric graphite phase carbon nitride powder, 0.05 part of desulfurized gypsum, 0.07 part of coal gangue powder, 0.2 part of steel slag powder, 0.002 part of plastic expanding agent, 0.002 part of defoamer, 0.001 part of powder polycarboxylate water reducer, 0.001 part of polyacrylamide, 0.001 part of polyglycerol fatty acid ester, 0.003 part of perlite, 0.65 part of common silicon cement, 2.8 parts of building sand and 0.4 part of water are mixed and stirred uniformly.
Comparative example 1
The materials and compositions of the micro-expansive cement mortar capable of degrading nitrogen oxides under natural light provided in this comparative example are basically the same as those of example 1, except that the amphoteric graphite phase carbon nitride powder in the materials is replaced with block graphite phase carbon nitride.
Comparative example 2
The materials and compositions of the micro-expansive cement mortar capable of degrading nitrogen oxides under natural light provided in this comparative example are basically the same as those of example 1, except that the amphoteric graphite phase carbon nitride powder is replaced with: collecting the residual lower layer sediment after the amphoteric graphite phase carbon nitride nano-sheet colloid, and drying to prepare the graphite phase carbon nitride.
Comparative example 3
The materials and compositions of the micro-expansive cement mortar capable of degrading nitrogen oxides under natural light provided by the comparative example are basically the same as those of the embodiment 1, and the difference is that the plastic expanding agent is replaced by an inorganic calcareous expanding agent, which meets the II-type technical index requirement in GB/T23439 concrete expanding agent.
Comparative example 4
The materials and compositions of the micro-expansive cement mortar capable of degrading nitrogen oxides under natural light provided in this comparative example are basically the same as those of example 1, except that the mineral activity activator is replaced by triethanolamine.
Comparative example 5
The materials and composition of the micro-expansive cement mortar capable of degrading nitrogen oxides under natural light provided in this comparative example are substantially the same as those of example 1, except that perlite is replaced with stone powder which is an inert material.
The photocatalytic performance of the mortar was evaluated by the following method:
the photocatalysis reactor adopts a closed ventilation pipeline, a cement mortar test block is filled in the middle of the pipeline, a simulated sunlight light source is arranged at the top of the device, nitric oxide is taken as a pollutant for simulating nitrogen oxides in the atmosphere, the gas flow rate is 0.3L/min, and the testing environment temperature is 20 ℃ and the humidity is 60+/-5%. Gas samples of the gas inlet and the gas outlet are collected at intervals of 1 hour, the concentration of target pollutants is analyzed, and the photocatalytic efficiency of the cement mortar is calculated according to the following formula:
η＝(C0-Cx)/C0
wherein C is 0 Nitric oxide concentration is the air inlet; c (C) x Nitric oxide concentration at the outlet; eta is the photocatalytic efficiency (%)
The standard group is common building mortar, and meets the technical index requirement of the dry plastering mortar strength grade M20 in the standard JG/T230-2007 premixed mortar.
The compressive strength of the mortar test block is tested according to the industry standard JGJ 70-2009 building mortar basic performance test method.
Mortar expansion performance is tested according to national standard GB/T23439-2017 concrete expansion agent, and curing conditions are 20 ℃ water curing.
The early crack resistance of mortar is detected by referring to national standard GB/T50082-2009 "method for testing the long-term performance and durability of ordinary concrete", wherein the flat plate crack performance test adopts a flat plate mold with the dimensions of 800mm multiplied by 600mm multiplied by 100mm, 7 crack inducers are contained, and the wind speed at the center of the surface of a test piece is kept to be not less than 5m/s.
The test results of the compressive strength, the limiting expansion rate, the cracking resistance and the photocatalytic performance of the different micro-expansion mortar samples are shown in table 1.
TABLE 1 mortar Performance test results
As shown by test results, the comprehensive effect of the embodiment 3 is optimal, the compressive strength of the mortar 28d is 36.4MPa, the limiting expansion rates of the 7d mortar and the 28d mortar under the water curing condition of 20 ℃ are 0.011% and 0.026%, the photocatalytic efficiency is 18.6%, and the cracking area reduction rate is 80.7%. At the same time, it can be found that: in the embodiment, compared with comparative examples 1 and 2, the degradation efficiency of the nitrogen oxide compound is greatly improved by adopting the amphoteric graphite phase carbon nitride; compared with a single early strength agent, the composite mineral activity excitant can remarkably improve the mechanical property of mortar; the perlite can improve the later-stage compressive strength and the cracking resistance of the mortar; compared with inorganic calcium expanding agent, the plastic expanding agent has obvious effect of inhibiting early cracks of mortar and has good synergistic effect among all components, and the micro-expansion cement mortar capable of degrading nitrogen oxides under natural light has wide application prospect under the background of serious treatment of the current government to the atmospheric environment and great development of the building industry.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The micro-expansion cement mortar capable of degrading nitrogen oxides under natural light is characterized by comprising the following components in parts by weight: 0.01-0.03 part of amphoteric graphite phase carbon nitride, 0.04-0.08 part of desulfurized gypsum, 0.05-0.1 part of coal gangue powder, 0.1-0.2 part of steel slag powder, 0.001-0.005 part of plastic expanding agent, 0.001-0.005 part of defoamer, 0.001-0.002 part of powdery polycarboxylate water reducer, 0.001-0.003 part of mineral activity activator, 0.001-0.005 part of perlite, 0.5-0.7 part of silicate cement, 2-4 parts of construction sand and 0.4 part of water, wherein the other components except for water and the construction sand are all powder and the total amount is 1 part.
2. The micro-expansive cement mortar capable of degrading nitrogen oxides under natural light according to claim 1, wherein the preparation method of the amphoteric graphite phase carbon nitride comprises the following two steps:
the first step: the raw materials are melamine, dicyandiamide or cyanamide, the raw materials are heated to 500-550 ℃ in a muffle furnace at the speed of 2-10 ℃/min, the temperature is kept for 200-300min, and then the temperature is reduced to room temperature in the furnace to obtain blocky graphite phase carbon nitride, and the blocky graphite phase carbon nitride is ground into graphite phase carbon nitride powder for standby;
and a second step of: weighing a certain amount of graphite-phase carbon nitride powder, placing the graphite-phase carbon nitride powder into 5-15mol/L sulfuric acid solution according to the mass ratio of the graphite-phase carbon nitride powder to the sulfuric acid solution of 1:5-1:10, stirring for 20-30h under the condition of ultrasonic dispersion, and then rotationally separating the obtained mixed system by using a centrifugal separator to obtain lower-layer sediment;
sequentially washing, dispersing and centrifuging the lower layer precipitate, repeating for several times, and repeatedly collecting the upper layer colloid, namely the amphoteric graphite phase carbon nitride nanosheet colloid; and (3) placing the colloid in a baking oven at 70-90 ℃ for drying and grinding to obtain the amphoteric graphite phase carbon nitride powder.
3. The micro-expansive cement mortar of claim 1, wherein the thickness of the nano-sheets in the amphoteric graphite phase carbon nitride nano-sheet colloid is less than 10nm and the length is less than 100nm.
4. A micro-expansive cement mortar capable of degrading nitrogen oxides under natural light according to claim 1, wherein the sulfur trioxide content in said desulfurized gypsum is 40-43%.
5. The micro-expansive cement mortar capable of degrading nitrogen oxides under natural light as claimed in claim 1, wherein the gangue powder is obtained by grinding gangue with an air flow mill, and has a specific surface area of 600-700kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The steel slag powder is obtained by grinding steel slag through an airflow mill, and the specific surface area is 400-500kg/m 2 。
6. The micro-expansive cement mortar of claim 1, wherein said plastic expanding agent is azodicarbonamide with bulk density of 400-500kg/m 3 。
7. A micro-expansive cement mortar degradable for nitrogen oxides under natural light according to claim 1, wherein said defoaming agent is propylene glycol block polyether.
8. The micro-expansive cement mortar capable of degrading nitrogen oxides under natural light according to claim 1, wherein the water reducing rate of the powdery polycarboxylate water reducer is 25-30%; the granularity of the perlite is 80-120 meshes.
9. The micro-expansive cement mortar capable of degrading nitrogen oxides under natural light as claimed in claim 1, wherein the mineral activity excitant consists of polyacrylamide and polyglycerin fatty acid ester according to a mass ratio of 1:1-1:3.
10. The method for preparing the micro-expansion cement mortar capable of degrading nitrogen oxides under natural light according to any one of claims 1 to 9, which is characterized in that amphoteric graphite phase carbon nitride, desulfurized gypsum, gangue powder, plastic expanding agent, defoamer, steel slag powder, powder polycarboxylate water reducer, mineral activity excitant, perlite, common silica cement, building sand and water are fully mixed according to a proportion to obtain the micro-expansion cement mortar capable of degrading nitrogen oxides under natural light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311313638.6A CN117486553A (en) | 2023-10-11 | 2023-10-11 | Micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311313638.6A CN117486553A (en) | 2023-10-11 | 2023-10-11 | Micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117486553A true CN117486553A (en) | 2024-02-02 |
Family
ID=89675310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311313638.6A Pending CN117486553A (en) | 2023-10-11 | 2023-10-11 | Micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117486553A (en) |
-
2023
- 2023-10-11 CN CN202311313638.6A patent/CN117486553A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112110675B (en) | Environment-friendly anti-cracking waterproof agent for concrete and preparation method thereof | |
| CN109621925B (en) | Carbon dioxide trapping agent and application thereof | |
| US11339091B2 (en) | Cementitious material and production method thereof | |
| CN113336516A (en) | Cementing material prepared from multi-element solid wastes and cooperative regulation and control method thereof | |
| CN106082731B (en) | A kind of fly ash baking-free high-strength ceramic granule and preparation method thereof | |
| CN113499778B (en) | High-temperature flue gas denitration catalyst for coal gas slag cement kiln and preparation method of high-temperature flue gas denitration catalyst | |
| CN113072313B (en) | Method for preparing ecological concrete by cooperatively utilizing waste residues and wastewater in coal chemical industry | |
| CN115893879B (en) | Preparation method of solid waste-based superfine special composite cementing material and cementing material | |
| CN101486544A (en) | Polymer cement mortar for photocatalysis degrading nitrous oxides NOx | |
| CN1895802A (en) | Treatment of aluminum electrolytic cell waste refractory materials | |
| CN105384375A (en) | Active admixture for building materials | |
| CN117486553A (en) | Micro-expansion cement mortar capable of degrading nitrogen oxides under natural light and preparation method thereof | |
| CN106746980A (en) | A kind of utilization red mud solid waste prepares the method with photo-catalysis function cement mortar | |
| CN110078456A (en) | It is a kind of with absorption, the plaster board of photocatalysis performance and its preparation method and application | |
| CN106118803B (en) | House refuse low temperature pyrogenation stove Nei bioxin inhibitor and preparation method and application | |
| CN114634340A (en) | Cement-based material added with ultrafine fly ash and preparation process thereof | |
| CN113582565B (en) | Activation method of waste rock wool and application of activation method | |
| CN113402183B (en) | Preparation method of multifunctional titanium-containing solid waste source cement-based material | |
| CN114920473A (en) | Multi-element low-carbon less-clinker composite cement and preparation method thereof | |
| CN116282992A (en) | Flue gas CO 2 Preparation method of sealing and microfiber reinforced cement | |
| CN113880486A (en) | Composite admixture utilizing solid waste of iron and steel plant and preparation method thereof | |
| CN102923978B (en) | Method for preparing sulphoaluminate cement raw material by using incineration fly ash and formula of sulphoaluminate cement | |
| CN107469763B (en) | Method for preparing water body defluorination material by utilizing steam pressurized concrete building block | |
| Zhu et al. | The Preparation of Porous Activated Slag Granules/TiO2 Photocatalyst and Its De-NO x Performance | |
| CN114405240B (en) | Method for preparing denitration material by using gas slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |