CN110433868A - A kind of aerogel composite and preparation method thereof for formaldehyde catalytic decomposition - Google Patents
A kind of aerogel composite and preparation method thereof for formaldehyde catalytic decomposition Download PDFInfo
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- CN110433868A CN110433868A CN201910655887.0A CN201910655887A CN110433868A CN 110433868 A CN110433868 A CN 110433868A CN 201910655887 A CN201910655887 A CN 201910655887A CN 110433868 A CN110433868 A CN 110433868A
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- manganese dioxide
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 239000004964 aerogel Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 34
- 238000003421 catalytic decomposition reaction Methods 0.000 title claims abstract description 22
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 98
- 239000011858 nanopowder Substances 0.000 claims abstract description 36
- -1 polysiloxanes Polymers 0.000 claims abstract description 36
- 239000006185 dispersion Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000002904 solvent Substances 0.000 claims abstract description 17
- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 3
- 239000000499 gel Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000012153 distilled water Substances 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 14
- 125000000217 alkyl group Chemical group 0.000 claims description 11
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 10
- 229910000077 silane Inorganic materials 0.000 claims description 10
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- 235000019441 ethanol Nutrition 0.000 claims description 8
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 7
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 7
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- 239000002270 dispersing agent Substances 0.000 claims description 6
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 3
- SBRXLTRZCJVAPH-UHFFFAOYSA-N ethyl(trimethoxy)silane Chemical compound CC[Si](OC)(OC)OC SBRXLTRZCJVAPH-UHFFFAOYSA-N 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- NMEPHPOFYLLFTK-UHFFFAOYSA-N trimethoxy(octyl)silane Chemical compound CCCCCCCC[Si](OC)(OC)OC NMEPHPOFYLLFTK-UHFFFAOYSA-N 0.000 claims description 3
- GSNUFIFRDBKVIE-UHFFFAOYSA-N DMF Natural products CC1=CC=C(C)O1 GSNUFIFRDBKVIE-UHFFFAOYSA-N 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims 1
- AHVYPIQETPWLSZ-UHFFFAOYSA-N N-methyl-pyrrolidine Natural products CN1CC=CC1 AHVYPIQETPWLSZ-UHFFFAOYSA-N 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 239000012855 volatile organic compound Substances 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000003915 air pollution Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000007720 emulsion polymerization reaction Methods 0.000 description 2
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 150000001343 alkyl silanes Chemical class 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 125000005909 ethyl alcohol group Chemical group 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000003863 metallic catalyst Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002866 paraformaldehyde Polymers 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000004040 pyrrolidinones Chemical class 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/32—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of manganese, technetium or rhenium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a kind of aerogel composites for formaldehyde catalytic decomposition, the material is load powder with manganese dioxide nano powder, it is support carrier with large aperture modified polyorganosiloxane aeroge, the manganese dioxide nano powder quality content is 1% ~ 15%, and it is 85% ~ 99% that polysiloxanes mass content is improved in large aperture.The present invention may be implemented high exposed area and active site position, improve catalytic decomposition efficiency, moreover it is possible to as backing material, realize gas quickly through with separate.The invention also discloses the preparation methods for the aerogel composite being catalytically decomposed for formaldehyde, the large aperture polysiloxanes aeroge of improvement preparation is soaked in manganese dioxide dispersion liquid, sufficiently dry out solvent after absorption obtains manganese dioxide and receives the aerogel composite of high load amount.Preparation method is simple, is easy to industrialize.
Description
Technical field
The invention belongs to organic pollutant degradation fields, are related to the catalytic decomposition of formaldehyde, and in particular to one kind is used for formaldehyde
Aerogel composite of catalytic decomposition and preparation method thereof.
Background technique
In recent years, air pollution problems inherent was one and increasingly causes topic concerned by people.And with human living, life
Living, the closely bound up room air pollution that works is even more to obtain our attention.Since the 1990s, Interior Space
Gas pollution problem has become a global problem.Especially we send out in economic, science and technology and society's high speed
The country of exhibition, in the latest 20 years, the living standard of the people obtains very big improve.Interior decoration decoration,
Plank furniture, domestic electric appliance and numerous chemical daily necessities have more and more been used to the room that we live
Among interior environment.
Indoor air pollutants are mainly that (Volatile Organic Compounds is referred to as volatile organic matter
VOCs).VOCs refers under normal pressure, organic compound of the boiling point between 50 DEG C to 260 DEG C.VOCs
Human liver, kidney, in terms of all have toxicity, or even the VOCs played the role of have carcinogenic, its serious shadow
The health for arriving human body is rung, the pollution of environment is caused.In numerous VOCs gases, formaldehyde be contacted in human lives it is most common,
It is also one of most harmful gas.Nowadays international researcher pays much attention to the problem of formaldehyde, is largely studied
Work, wherein mainly including catalysis and absorption etc. in the method to catalytic degradation formaldehyde.
In order to cope with the air pollution problem inside rooms got worse, people's research how by pollutant by physical absorption or
Person's chemical method carries out catalytic degradation.Wherein manganese dioxide is as a kind of metallic catalyst, excellent due to itself catalytic performance
It is good and intermediate noxious products will not be generated, obtain extensive concern and further investigation.
The patent of Publication No. CN105964290A discloses a kind of catalysis oxidation and removes formaldehyde catalyst and preparation method thereof.
A kind of catalysis oxidation removes formaldehyde catalyst, including modified support and the active component being carried on modified support；The modification
Carrier is by butyl titanate and silane coupler modified porous carrier, and active component is core-kernel structure Agx- Au receives
Rice material.This method aoxidizes formaldehyde by precious metal catalyst, but noble metal is expensive, and is easy to lose activity, and causes
The invention practical application is very restricted.
The patent of Publication No. CN109622065A discloses the loaded catalyst and its system of a kind of room temperature removal formaldehyde
Preparation Method.The loaded catalyst of this room temperature removal formaldehyde is the porous polymer for loading manganese dioxide.This room temperature removal
The loaded catalyst of formaldehyde is made by High Internal Phase Emulsion polymerization reaction.The load two that the invention is prepared by emulsion polymerization
Manganese oxide nano-powder, dispersibility is not all right, and the specific surface area contacted with formaldehyde gas is smaller, thus it is lower that efficiency is catalytically decomposed.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide the aeroge composite woods being catalytically decomposed for formaldehyde
Material, by aerogel carried manganese dioxide nano powder, not only may be implemented high exposed area and active site position, improve
Efficiency is catalytically decomposed, moreover it is possible to as backing material, realize gas quickly through with separate.Another object of the present invention is to mention
Preparation method for the aerogel composite being catalytically decomposed for formaldehyde, by the large aperture polysiloxanes aeroge of improvement preparation
Be soaked in manganese dioxide dispersion liquid, sufficiently absorption after dry out solvent, obtain manganese dioxide receive high load amount aeroge it is compound
Material.Preparation method is simple, is easy to industrialize.
The present invention is achieved by the following technical solutions:
A kind of aerogel composite for formaldehyde catalytic decomposition, the material are load powder with manganese dioxide nano powder,
It is support carrier with large aperture modified polyorganosiloxane aeroge, the manganese dioxide nano powder quality content is 1% ~ 15%, greatly
It is 85% ~ 99% that polysiloxanes mass content is improved in aperture.
Further improvement of the present invention scheme are as follows:
A kind of preparation method of the aerogel composite for formaldehyde catalytic decomposition, includes the following steps:
Preparation large aperture modified polyorganosiloxane aeroge: the trialkoxy silane containing alkyl group is mixed with distilled water
Be 9.5 ~ 11.5 solution gels to be made to obtain gel with the pH value that concentrated ammonia liquor adjusts solution to clear solution, by soak in
Distilled water 10 ~ 20 h of aging within the scope of 40 ~ 70 DEG C, then the gel of aging is spontaneously dried under normal pressure, it is prepared
The modified poly- times siloxanes aeroge in blocky large aperture；
It prepares manganese dioxide dispersion liquid: obtaining two for being sanded at a high speed after manganese dioxide nano powder, solvent and dispersant
Manganese oxide dispersion liquid；
Aerogel composite of the preparation for formaldehyde catalytic decomposition: by the modified poly- times siloxanes airsetting in the large aperture of above-mentioned preparation
Glue is immersed in the manganese dioxide dispersion liquid of above-mentioned preparation, sufficiently after absorption, 60-120oC dries 1h ~ 8h, keeps solvent complete
Volatilization, manganese dioxide nano powder adsorbed close obtain the aeroge composite wood being catalytically decomposed for formaldehyde in aeroge inner wall
Material.
Further, the trialkoxy silane containing alkyl group is in the clear solution that it is mixed to prepare with distilled water
Weight content be 16wt% ~ 32wt%.
Further, the trialkoxy silane containing alkyl group is methyltrimethoxysilane, methyl triethoxy
One or more of silane, ethyl trimethoxy silane, vinyltriethoxysilane, octyl trimethoxy silane are mixed
It closes.
Further, the mass concentration of the concentrated ammonia liquor is 24% ~ 28%.
Further, the manganese dioxide nano powder, solvent with the weight ratio of dispersing agent be 1 ~ 30:65 ~ 98:1 ~ 5.
Further, the solvent is ethyl alcohol, isopropanol, DMF, DMSO, one or more of PMA mixing.
Further, the dispersing agent is polyvinylpyrrolidone or polyethylene glycol or both mixing.
Further, the sand milling speed is the r/min of 1500 r/min ~ 2500, and the time is 1h ~ 8h.
Further, when the modified poly- times siloxanes aeroge in large aperture being immersed in manganese dioxide dispersion liquid, large aperture
The volume ratio of modified poly- times siloxanes aeroge and manganese dioxide dispersion liquid is 1:1 ~ 3.
The invention has the benefit that
Using the incompatibility of alkyl group and water, occur mutually to separate to form macroporous structure in gel process.Using containing alkyl
Silane is raw material, and water is solvent, and organic solvent and surfactant is not added, and occurs mutually to separate to be formed in the sol-gel process
Macropore.The macropore of aeroge is bigger, and macropore can connect from each other, and mother liquor more can be filled adequately, guarantees oxidation
On the wall of the poly- times siloxanes aeroge of the more uniform load of manganese nanoparticle.
The modified poly- times siloxanes aeroge in large aperture is immersed in manganese dioxide dispersion liquid by the present invention, after dry out solvent,
Nano-powder adsorbed close is in aeroge inner wall, so that manganese dioxide nano powder load capacity with higher, improves catalysis point
Solve efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the aerogel composite for formaldehyde catalytic decomposition prepared by embodiment 1；
Fig. 2 is the curve graph that content of formaldehyde varies with temperature when aerogel composite made from embodiment 1 is catalyzed Formaldehyde decomposition；
Fig. 3 is content of formaldehyde time history plot when aerogel composite made from embodiment 1 is catalyzed Formaldehyde decomposition.
Specific embodiment
Embodiment 1
It is mixed methyltriethoxysilane and distilled water to obtain clear solution, wherein the tri-alkoxy silicon containing alkyl group
The content of alkane is 16wt%, and the pH value that 26% concentrated ammonia liquor adjusting solution is then added makes solution gels obtain gel for 9.5；It will coagulate
Glue is soaked in distilled water 10 h of aging within the scope of 50 DEG C, then the gel of aging is spontaneously dried under normal pressure, is prepared into
To blocky large aperture polyoxy alkane aeroge.
It is sanded at a high speed after manganese dioxide nano powder, ethyl alcohol and polyvinylpyrrolidone are mixed and obtains manganese dioxide point
Dispersion liquid.Time 4h is wherein sanded, 2000 r/min of speed is sanded.Wherein manganese dioxide nano powder, ethyl alcohol and polyethylene pyrrole
The weight of pyrrolidone is 5:95:1.
The ventilative polysiloxanes in the large aperture of preparation is immersed in the solution of above-mentioned nano-powder, wherein large aperture is modified
The volume ratio of poly- times siloxanes aeroge and manganese dioxide dispersion liquid is that sample is placed in 60 sufficiently after absorption by 1:3oC dries
In case, 4h is dried, after solvent volatilizees completely, nano-powder adsorbed close is obtained and is catalytically decomposed for formaldehyde in aeroge inner wall
Aerogel composite.
Embodiment 2:
It is mixed ethyl trimethoxy silane and distilled water to obtain clear solution, wherein the tri-alkoxy silicon containing alkyl group
The content of alkane is 25wt%, and the pH value that 24% concentrated ammonia liquor adjusting solution is then added makes solution gels obtain gel for 9.5；It will coagulate
Glue is soaked in distilled water 20 h of aging within the scope of 40 DEG C, then the gel of aging is spontaneously dried under normal pressure, is prepared into
To blocky large aperture polyoxy alkane aeroge.
It is sanded at a high speed after manganese dioxide nano powder, isopropanol and polyvinylpyrrolidone are mixed and obtains manganese dioxide
Dispersion liquid.Time 1h is wherein sanded, 2500 r/min of speed is sanded.Wherein manganese dioxide nano powder, ethyl alcohol and polyethylene
The weight of pyrrolidones is 30:65:5.
The ventilative polysiloxanes in the large aperture of preparation is immersed in the solution of above-mentioned nano-powder, wherein large aperture is modified
The volume ratio of poly- times siloxanes aeroge and manganese dioxide dispersion liquid is that sample is placed in 120 sufficiently after absorption by 1:1oC
In baking oven, 1h is dried, after solvent volatilizees completely, nano-powder adsorbed close is obtained in aeroge inner wall for formaldehyde catalysis point
The aerogel composite of solution.
Embodiment 3:
It is mixed methyltrimethoxysilane and distilled water to obtain clear solution, wherein the content of methyltrimethoxysilane
For 16wt%, the pH value that 26% concentrated ammonia liquor adjusting solution is then added makes solution gels obtain gel for 10.5；By soak
In distilled water within the scope of 70 DEG C 10 h of aging, then the gel of aging is spontaneously dried under normal pressure, bulk is prepared
Large aperture polyoxy alkane aeroge.
It is sanded at a high speed after manganese dioxide nano powder, DMF and polyethylene glycol are mixed and obtains manganese dioxide dispersion liquid.Its
1500 r/min of speed is sanded in middle sand milling time 8h.Wherein manganese dioxide nano powder, ethyl alcohol and polyvinylpyrrolidone
Weight is 1:82:3.
The ventilative polysiloxanes in the large aperture of preparation is immersed in the solution of above-mentioned nano-powder, wherein large aperture is modified
The volume ratio of poly- times siloxanes aeroge and manganese dioxide dispersion liquid is that sample is placed in 80 sufficiently after absorption by 1:2oC dries
In case, 4h is dried, after solvent volatilizees completely, nano-powder adsorbed close is obtained and is catalytically decomposed for formaldehyde in aeroge inner wall
Aerogel composite.
Embodiment 4:
It is mixed vinyltriethoxysilane and distilled water to obtain clear solution, wherein the tri-alkoxy containing alkyl group
The content of silane is 22wt%, and the pH value that 28% concentrated ammonia liquor adjusting solution is then added makes solution gels obtain gel for 11.5；
By soak in distilled water 15 h of aging within the scope of 50 DEG C, then the gel of aging spontaneously dried under normal pressure, made
It is standby to obtain blocky large aperture polyoxy alkane aeroge.
It is sanded at a high speed after manganese dioxide nano powder, DMSO and polyethylene glycol are mixed and obtains manganese dioxide dispersion liquid.
Time 4h is wherein sanded, 2000 r/min of speed is sanded.Wherein manganese dioxide nano powder, ethyl alcohol and polyvinylpyrrolidone
Weight be 5:95:1.
The ventilative polysiloxanes in the large aperture of preparation is immersed in the solution of above-mentioned nano-powder, wherein large aperture is modified
The volume ratio of poly- times siloxanes aeroge and manganese dioxide dispersion liquid is that sample is placed in 60 sufficiently after absorption by 1:3oC dries
In case, 4h is dried, after solvent volatilizees completely, nano-powder adsorbed close is obtained and is catalytically decomposed for formaldehyde in aeroge inner wall
Aerogel composite.
Embodiment 5:
It is mixed octyl trimethoxy silane and distilled water to obtain clear solution, wherein the tri-alkoxy silicon containing alkyl group
The content of alkane is 32wt%, and the pH value that 26% concentrated ammonia liquor adjusting solution is then added makes solution gels obtain gel for 9.5；It will coagulate
Glue is soaked in distilled water 10 h of aging within the scope of 50 DEG C, then the gel of aging is spontaneously dried under normal pressure, is prepared into
To blocky large aperture polyoxy alkane aeroge.
It is sanded at a high speed after manganese dioxide nano powder, PMA and polyvinylpyrrolidone are mixed and obtains manganese dioxide point
Dispersion liquid.Time 4h is wherein sanded, 2000 r/min of speed is sanded.Wherein manganese dioxide nano powder, ethyl alcohol and polyethylene pyrrole
The weight of pyrrolidone is 18:90:3.
The ventilative polysiloxanes in the large aperture of preparation is immersed in the solution of above-mentioned nano-powder, wherein large aperture is modified
The volume ratio of poly- times siloxanes aeroge and manganese dioxide dispersion liquid is that sample is placed in 60 sufficiently after absorption by 1:2oC dries
In case, 4h is dried, after solvent volatilizees completely, nano-powder adsorbed close is obtained and is catalytically decomposed for formaldehyde in aeroge inner wall
Aerogel composite.
Embodiment 6
Composite aerogel prepared by embodiment 1 is placed in the quartz fixed bed reactor of diameter 1cm, fixed bed reaction
Normal pressure is kept, outside puts on heating tube, and calefactive interzone is 25-180 DEG C.Compressed air makes paraformaldehyde by compound as carrier gas
Siloxanes aerogel catalyst, mixed gas flow velocity are about 100 mL min-1, wherein concentration of formaldehyde is about 100 ppm.With temperature
Degree is abscissa, and Formaldehyde decomposition rate is ordinate, draws curve, as shown in Fig. 2, as seen from Figure 2, it is prepared by the present invention multiple
It closes siloxanes aeroge formaldehyde catalytic decomposition ability and increases raising rapidly with temperature, balance is kept after reaching capacity.
Composite aerogel prepared by embodiment 1 is placed in the closed glass reactor of a 5L, bulk temperature is protected
25 DEG C are held, relative humidity 60%.38% formalin of 15 μ L is filled with into container, after formaldehyde volatilizees completely in container just
Beginning formaldehyde vapors concentration is about 180 ppm.Start timing, is vertical sit with formaldehyde vapors concentration in container using the time as abscissa
Mark draws curve, as shown in figure 3, from figure 3, it can be seen that compound siloxanes aeroge prepared by the present invention has excellent first
Aldehyde capacity of decomposition.
Composite aerogel Formaldehyde decomposition ability having the same prepared by embodiment 2 to 5, details are not described herein again.
Claims (10)
1. a kind of aerogel composite for formaldehyde catalytic decomposition, which is characterized in that the material is with manganese dioxide nano powder
Body is load powder, is support carrier with large aperture modified polyorganosiloxane aeroge, and the manganese dioxide nano powder quality contains
Amount is 1% ~ 15%, and it is 85% ~ 99% that polysiloxanes mass content is improved in large aperture.
2. a kind of preparation method of the aerogel composite for formaldehyde catalytic decomposition, which comprises the steps of:
Preparation large aperture modified polyorganosiloxane aeroge: the trialkoxy silane containing alkyl group is mixed with distilled water
Be 9.5 ~ 11.5 solution gels to be made to obtain gel with the pH value that concentrated ammonia liquor adjusts solution to clear solution, by soak in
Distilled water 10 ~ 20 h of aging within the scope of 40 ~ 70 DEG C, then the gel of aging is spontaneously dried under normal pressure, it is prepared
The modified poly- times siloxanes aeroge in blocky large aperture；
It prepares manganese dioxide dispersion liquid: obtaining two for being sanded at a high speed after manganese dioxide nano powder, solvent and dispersant
Manganese oxide dispersion liquid；
Aerogel composite of the preparation for formaldehyde catalytic decomposition: by the modified poly- times siloxanes airsetting in the large aperture of above-mentioned preparation
Glue is immersed in the manganese dioxide dispersion liquid of above-mentioned preparation, sufficiently after absorption, 60-120oC dries 1h ~ 8h, keeps solvent complete
Volatilization, manganese dioxide nano powder adsorbed close obtain the aeroge composite wood being catalytically decomposed for formaldehyde in aeroge inner wall
Material.
3. a kind of preparation method of aerogel composite for formaldehyde catalytic decomposition according to claim 2, special
Sign is: weight content of the trialkoxy silane containing alkyl group in the clear solution that it is mixed to prepare with distilled water
For 16wt% ~ 32wt%.
4. a kind of system of the aerogel composite for formaldehyde catalytic decomposition according to Claims 2 or 3 any one
Preparation Method, it is characterised in that: the trialkoxy silane containing alkyl group is methyltrimethoxysilane, methyl triethoxy
One or more of silane, ethyl trimethoxy silane, vinyltriethoxysilane, octyl trimethoxy silane are mixed
It closes.
5. a kind of preparation method of aerogel composite for formaldehyde catalytic decomposition according to claim 2, special
Sign is: the mass concentration of the concentrated ammonia liquor is 24% ~ 28%.
6. a kind of preparation method of aerogel composite for formaldehyde catalytic decomposition according to claim 2, special
Sign is: the manganese dioxide nano powder, solvent with the weight ratio of dispersing agent be 1 ~ 30:65 ~ 98:1 ~ 5.
7. a kind of system of the aerogel composite for formaldehyde catalytic decomposition according to claim 2 or 6 any one
Preparation Method, it is characterised in that: the solvent be ethyl alcohol, isopropanol, DMF, DMSO, NMP, MDBE, one or both of PMA with
Upper mixing.
8. a kind of system of the aerogel composite for formaldehyde catalytic decomposition according to claim 2 or 6 any one
Preparation Method, it is characterised in that: the dispersing agent is polyvinylpyrrolidone or polyethylene glycol or both mixing.
9. a kind of preparation method of aerogel composite for formaldehyde catalytic decomposition according to claim 2, special
Sign is: the sand milling speed is the r/min of 1500 r/min ~ 2500, and the time is 1h ~ 8h.
10. a kind of preparation method of aerogel composite for formaldehyde catalytic decomposition according to claim 2, special
Sign is: when the modified poly- times siloxanes aeroge in large aperture is immersed in manganese dioxide dispersion liquid, the modified poly- times silicon in large aperture
The volume ratio of oxygen alkane aeroge and manganese dioxide dispersion liquid is 1:1 ~ 3.
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| CN111732753A (en) * | 2020-06-04 | 2020-10-02 | 淮阴工学院 | Flexible polysiloxane aerogel and rapid preparation method thereof |
| CN115895823A (en) * | 2022-11-09 | 2023-04-04 | 湖北工业大学 | Filtering method for improving quality of white spirit |
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| CN111732753A (en) * | 2020-06-04 | 2020-10-02 | 淮阴工学院 | Flexible polysiloxane aerogel and rapid preparation method thereof |
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Application publication date: 20191112 |