CN113181970B - Air purification PP nanofiber membrane and preparation method thereof - Google Patents
Air purification PP nanofiber membrane and preparation method thereof Download PDFInfo
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- 239000002121 nanofiber Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000004887 air purification Methods 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 47
- 229910052738 indium Inorganic materials 0.000 claims abstract description 43
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910002601 GaN Inorganic materials 0.000 claims abstract description 36
- 239000004743 Polypropylene Substances 0.000 claims abstract description 34
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- 238000010438 heat treatment Methods 0.000 claims abstract description 28
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- 239000000463 material Substances 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims abstract description 15
- -1 polypropylene Polymers 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000007873 sieving Methods 0.000 claims abstract description 12
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims abstract description 11
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 10
- 238000010041 electrostatic spinning Methods 0.000 claims abstract description 8
- BSCHIACBONPEOB-UHFFFAOYSA-N oxolane;hydrate Chemical compound O.C1CCOC1 BSCHIACBONPEOB-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011941 photocatalyst Substances 0.000 claims description 45
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 8
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 8
- 238000001523 electrospinning Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 78
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 27
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- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- 229920001732 Lignosulfonate Polymers 0.000 description 3
- XURCIPRUUASYLR-UHFFFAOYSA-N Omeprazole sulfide Chemical compound N=1C2=CC(OC)=CC=C2NC=1SCC1=NC=C(C)C(OC)=C1C XURCIPRUUASYLR-UHFFFAOYSA-N 0.000 description 3
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 3
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- 229920005610 lignin Polymers 0.000 description 3
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- 239000003054 catalyst Substances 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- B01J31/36—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of vanadium, niobium or tantalum
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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
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Abstract
The invention relates to the field of air purification filter materials, and discloses an air purification PP nanofiber membrane and a preparation method thereof. Comprising the following steps: sodium lignin sulfonate, in (NO) 3 ) 3 ·H 2 O and NH 4 VO 3 Adding into tetrahydrofuran water solution, heating, drying under nitrogen atmosphere, grinding, and sieving to obtain lignin-indium/vanadium complex fine powder; heating lignin-indium/vanadium complex fine powder to 250-300 ℃ under the protection of nitrogen, cooling to room temperature, grinding to obtain L/LnV-300 powder, fully mixing with gallium nitride powder, heating to 500-600 ℃ for reaction, and naturally cooling to obtain L/InV-GaN; mixing and heating the L/InV-GaN and the polypropylene melt-blown material to 240-280 ℃, and carrying out melt electrostatic spinning to obtain the air purification PP nanofiber membrane. The film has the capability of efficiently catalyzing degradation of harmful substances under visible light, and can degrade formaldehyde in air.
Description
Technical Field
The invention relates to the field of air purification filter materials, in particular to an air purification PP nanofiber membrane and a preparation method thereof.
Background
Along with the high-speed development of social economy and the improvement of living standard of people, people put forward higher requirements on comfort, health and high efficiency of indoor environment, and indoor air quality is also more and more concerned when indoor decoration and modernization surge are driven to rise. The research results show that a large amount of volatile organic compounds in the room are direct causes of the degradation of indoor air quality. The common ornaments, daily necessities and a large amount of petroleum products in living and workplaces of people can release volatile organic compounds, and especially paint, coating, various building materials and the like used for indoor decoration are main pollution sources. If living and working in the environment with bad air quality for a long time, people will show a series of pathological reactions such as headache, nausea, drowsiness and the like, which are called as 'sick building syndrome' in medicine, especially the volatile organic compounds in indoor air can have bad influence on the nervous system, the respiratory system and the cardiovascular system of human body, and can be carcinogenic when the situation is serious. Among these organic pollutants, formaldehyde is easily dissolved in water, and has wide indoor sources and high release concentration, and the pollution of formaldehyde is most serious through investigation and analysis, so that formaldehyde is generally paid attention to. At present, no method for directly and effectively removing indoor formaldehyde exists.
Disclosure of Invention
In view of the above, the present invention aims to provide an air-purifying PP nanofiber membrane and a preparation method thereof, wherein the membrane has the capability of efficiently catalyzing degradation of harmful substances under visible light, and can degrade formaldehyde in air.
In order to solve the technical problems, the invention provides a preparation method of an air purification PP nanofiber membrane, which comprises the following steps:
s1, drying sodium lignin sulfonate, in (NO 3 ) 3 ·H 2 O and NH 4 VO 3 Adding into 50% tetrahydrofuran water solution, stirring at room temperature until completely dissolving, heating to 110-150deg.C to obtain gel lignin-indium/vanadium complex, drying the gel lignin-indium/vanadium complex at 105deg.C under nitrogen atmosphere overnight, grinding, and sieving to obtain lignin-indium/vanadium complex fine powder;
s2, under the protection of nitrogen, heating the lignin-indium/vanadium complex fine powder to 250-300 ℃, cooling to room temperature, and grinding to obtain a photocatalyst L/LnV-300; L/LnV-300 is in the form of powder.
S3, under the protection of nitrogen, fully mixing the photocatalyst L/InV-300 powder and gallium nitride powder, heating to 500-600 ℃ for reacting for 20-40min, and naturally cooling to obtain the high-efficiency photocatalyst L/InV-GaN;
s4, mixing and heating the high-efficiency photocatalyst L/InV-GaN and polypropylene (PP) melt-blown material to 240-280 ℃, and carrying out melt electrostatic spinning to obtain the air purification PP nanofiber membrane.
Preferably, in step S1 of the above preparation method, sodium lignin sulfonate, in (NO 3 ) 3 ·H 2 O、NH 4 VO 3 And tetrahydrofuran aqueous solution in a ratio of (18-24) g (3-4) g (1-2) g:200mL.
Preferably, in step S1 of the above preparation method, the stirring time is 1h, and the sieving is a 360 mesh sieve.
Preferably, in step S2 of the preparation method, the heating rate is 20-30 ℃/min.
Preferably, in step S3 of the preparation method, the average particle size of the photocatalyst L/LnV-300 is 100-200nm, and the average particle size of the gallium nitride powder is 100-200nm.
Preferably, in step S3 of the preparation method, the ratio of the photocatalyst L/LnV-300 powder to the gallium nitride powder is 1:2-4.
Preferably, in step S3 of the preparation method, the heating rate is 20-30 ℃/min.
Preferably, in step S4 of the above preparation method, the ratio of the high-efficiency photocatalyst L/InV-GaN to the polypropylene melt-blown material is (3-8) g to 100g
Preferably, in the step S4 of the preparation method, the condition of the melt electrostatic spinning is that the temperature is 200-240 ℃, the voltage is 15-20kV, the distance is 15-20cm, and the injection rate is 1-2mL/h.
The invention also provides the air purification PP nanofiber membrane prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
1) According to the invention, lignosulfonate, indium nitrate and ammonium vanadate are used as reactants, a vanadium-lignin complex is obtained by complexing lignin degradation products through empty orbitals of vanadium atoms, and then the vanadium-lignin complex is further processed to obtain the indium vanadate photocatalyst (L/LnV-300), wherein the indium vanadate photocatalyst can transfer electrons under visible light, gallium nitride has semiconductor characteristics, electron-hole pairs can be formed, and the photocatalytic efficiency can be greatly enhanced. In addition, the reaction of lignosulfonate, indium nitrate and ammonium vanadate can synchronously generate ammonium nitrate to be doped in lignin-indium/vanadium complex fine powder, and the ammonium nitrate can be decomposed in the subsequent high-temperature heating process, so that products are crushed from the inside, and more uniform powder is obtained.
2) The high-efficiency photocatalyst L/InV-GaN is doped into polypropylene melt-blown material for electrostatic spinning, so that the visible light catalyst in the form of a nanofiber membrane can be prepared, and the wind resistance is smaller while the formaldehyde decomposition is catalyzed efficiently.
Drawings
FIG. 1 is a scanning electron microscope image of the air-purifying PP nanofiber membrane manufactured in example 1;
FIG. 2 is a graph of the high formaldehyde concentration continuous test of the sample of example 1;
FIG. 3 is a plot of the high formaldehyde concentration continuous test of the sample of example 2;
FIG. 4 is a plot of the high formaldehyde concentration continuous test of the sample of example 3;
FIG. 5 is a graph of comparative example 1 sample high formaldehyde continuous test;
FIG. 6 is a graph of comparative example 2 sample high formaldehyde continuous test;
FIG. 7 is a graph of comparative example 3 sample high formaldehyde continuous test;
FIG. 8 is a graph of comparative example 4 showing a high formaldehyde concentration continuous test.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
Example 1
An air purifying PP nanofiber membrane and a preparation method thereof comprise the following steps:
1. 20g of dried sodium lignin sulfonate and 3.5g of In (NO 3 ) 3 ·H 2 O、1.5g NH 4 VO 3 200mL of a 50% by mass aqueous solution of tetrahydrofuran was added thereto and stirred at room temperature for 1 hour, and then the mixed solution was heated to 130℃to prepare a gel-like lignin-indium/vanadium complex. Drying the gel lignin-indium/vanadium complex overnight at 105 ℃ under nitrogen atmosphere, grinding the solid by using an agate mortar, and sieving the solid by a 360-mesh sieve to obtain lignin-indium/vanadium complex fine powder;
2. heating the lignin-indium/vanadium complex fine powder prepared in the step 1 to 280 ℃ at a speed of 25 ℃/min under the protection of nitrogen in a quartz tube electric furnace, cooling to room temperature, and grinding the solid by using an agate mortar to obtain a photocatalyst L/LnV-300;
3. fully mixing 5g of the photocatalyst L/InV-300 powder with the average particle size of 150nm prepared in the step 2 and 15g of gallium nitride powder with the average particle size of 150nm, placing the mixture into a quartz tube electric furnace, heating to 550 ℃ at a speed of 25 ℃/min under the protection of nitrogen, reacting for 30min, and naturally cooling to prepare the high-efficiency photocatalyst L/InV-GaN;
4. and 5g of the high-efficiency photocatalyst L/InV-GaN prepared in the step 3 and 100g of polypropylene melt-blown material are mixed and heated to 260 ℃, and are subjected to melt electrostatic spinning under the conditions of 220 ℃ temperature, 18kV voltage, 18cm distance and 1.5mL/h injection rate, so that the air purification PP nanofiber membrane A is prepared. The scanning electron microscope is shown in fig. 1.
Example 2
An air purifying PP nanofiber membrane and a preparation method thereof comprise the following steps:
1. 18g of dried sodium lignin sulfonate and 3g of In (NO 3 ) 3 ·H 2 O、2g NH 4 VO 3 200mL of a 50% by mass aqueous solution of tetrahydrofuran was added thereto and stirred at room temperature for 1 hour, and then the mixed solution was heated to 110℃to prepare a gel-like lignin-indium/vanadium complex. Drying the gel lignin-indium/vanadium complex overnight at 105 ℃ under nitrogen atmosphere, grinding the solid by using an agate mortar, and sieving the solid by a 360-mesh sieve to obtain lignin-indium/vanadium complex fine powder;
2. heating the lignin-indium/vanadium complex fine powder prepared in the step 1 to 250 ℃ at a speed of 30 ℃/min under the protection of nitrogen in a quartz tube electric furnace, cooling to room temperature, and grinding the solid by using an agate mortar to obtain a photocatalyst L/LnV-300;
3. fully mixing 5g of the photocatalyst L/InV-300 powder with the average grain diameter of 200nm prepared in the step 2 and 10g of gallium nitride powder with the average grain diameter of 200nm, placing the mixture into a quartz tube electric furnace, heating to 500 ℃ at a speed of 30 ℃/min under the protection of nitrogen, reacting for 20min, and naturally cooling to prepare the high-efficiency photocatalyst L/InV-GaN;
4. 3g of the high-efficiency photocatalyst L/InV-GaN prepared in the step 3 and 100g of polypropylene melt-blown material are mixed and heated to 240 ℃, and are subjected to melt electrostatic spinning under the conditions of 240 ℃ temperature, 15kV voltage, 15cm distance and 1mL/h injection rate, so that the air purification PP nanofiber membrane B is prepared.
Example 3
An air purifying PP nanofiber membrane and a preparation method thereof comprise the following steps:
1. 24g of dried sodium lignin sulfonate and 4g of In (NO 3 ) 3 ·H 2 O、1g NH 4 VO 3 200mL of a 50% by mass aqueous solution of tetrahydrofuran was added thereto and stirred at room temperature for 1 hour, and then the mixed solution was heated to 150℃to prepare a gel-like lignin-indium/vanadium complex. Drying the gel lignin-indium/vanadium complex overnight at 105 ℃ under nitrogen atmosphere, grinding the solid by using an agate mortar, and sieving the solid by a 360-mesh sieve to obtain lignin-indium/vanadium complex fine powder;
2. heating the lignin-indium/vanadium complex fine powder prepared in the step 1 to 300 ℃ at a speed of 20 ℃/min under the protection of nitrogen in a quartz tube electric furnace, cooling to room temperature, and grinding the solid by using an agate mortar to obtain a photocatalyst L/LnV-300;
3. fully mixing 5g of the photocatalyst L/InV-300 powder with the average particle size of 100nm prepared in the step 2 and 20g of gallium nitride powder with the average particle size of 100nm, placing the mixture into a quartz tube electric furnace, heating to 600 ℃ at a speed of 20 ℃/min under the protection of nitrogen, reacting for 40min, and naturally cooling to prepare the high-efficiency photocatalyst L/InV-GaN;
4. 8g of the high-efficiency photocatalyst L/InV-GaN prepared in the step 3 and 100g of polypropylene melt-blown material are mixed and heated to 280 ℃, and are subjected to melt electrostatic spinning under the conditions of 200 ℃ of temperature, 20kV of voltage, 20cm of distance and 2mL/h of injection rate, so that the air purification PP nanofiber membrane C is prepared.
Comparative example 1
A nanofiber membrane and a preparation method thereof comprise the following steps:
1. 3.5g of In (NO 3 ) 3 ·H 2 O and 1.5g NH 4 VO 3 Add 200mL of tetrahydrofuran aqueous solution with the mass fraction of 50% is stirred for 1h at room temperature, and then the mixed solution is heated to 130 ℃ to prepare the gel lignin-indium/vanadium complex. Drying the gel lignin-indium/vanadium complex overnight at 105 ℃ under nitrogen atmosphere, grinding the solid by using an agate mortar, and sieving the solid by a 360-mesh sieve to obtain lignin-indium/vanadium complex fine powder;
2. heating the lignin-indium/vanadium complex fine powder prepared in the step 1 to 280 ℃ at a speed of 25 ℃/min under the protection of nitrogen in a quartz tube electric furnace, cooling to room temperature, and grinding the solid by using an agate mortar to obtain a photocatalyst L/LnV-300;
3. fully mixing 5g of the photocatalyst L/InV-300 powder with the average particle size of 150nm prepared in the step 2 and 15g of gallium nitride powder with the average particle size of 150nm, placing the mixture into a quartz tube electric furnace, heating to 550 ℃ at a speed of 25 ℃/min under the protection of nitrogen, reacting for 30min, and naturally cooling to prepare the photocatalyst L/InV-GaN;
4. and 5g of the photocatalyst L/InV-GaN prepared in the step 3 and 100g of polypropylene melt-blown material are mixed and heated to 260 ℃, and melt-electrospinning is carried out under the conditions of 220 ℃ temperature, 18kV voltage, 18cm distance and 1.5mL/h injection rate to prepare the nanofiber membrane D.
Comparative example 2
A nanofiber membrane and a preparation method thereof comprise the following steps:
1. 20g of dried sodium lignin sulfonate and 1.5g of NH are reacted 4 VO 3 200mL of a 50% by mass aqueous solution of tetrahydrofuran was added thereto and stirred at room temperature for 1 hour, and then the mixed solution was heated to 130℃to prepare a gel-like lignin-indium/vanadium complex. Drying the gel lignin-indium/vanadium complex overnight at 105 ℃ under nitrogen atmosphere, grinding the solid by using an agate mortar, and sieving the solid by a 360-mesh sieve to obtain lignin-indium/vanadium complex fine powder;
2. heating the lignin-indium/vanadium complex fine powder prepared in the step 1 to 280 ℃ at a speed of 25 ℃/min under the protection of nitrogen in a quartz tube electric furnace, cooling to room temperature, and grinding the solid by using an agate mortar to obtain a photocatalyst L/LnV-300;
3. fully mixing 5g of the photocatalyst L/InV-300 powder with the average particle size of 150nm prepared in the step 2 and 15g of gallium nitride powder with the average particle size of 150nm, placing the mixture into a quartz tube electric furnace, heating to 550 ℃ at a speed of 25 ℃/min under the protection of nitrogen, reacting for 30min, and naturally cooling to prepare the photocatalyst L/InV-GaN;
4. and 5g of the photocatalyst L/InV-GaN prepared in the step 3 and 100g of polypropylene melt-blown material are mixed and heated to 260 ℃, and melt-electrospinning is carried out under the conditions of 220 ℃ temperature, 18kV voltage, 18cm distance and 1.5mL/h injection rate to prepare the nanofiber membrane E.
Comparative example 3
A nanofiber membrane and a preparation method thereof comprise the following steps:
1. 20g of dried sodium lignin sulfonate and 3.5g of In (NO 3 ) 3 ·H 2 O is added into 200mL of tetrahydrofuran water solution with the mass fraction of 50%, stirred for 1h at room temperature, and then the mixed solution is heated to 130 ℃ to prepare the gel lignin-indium/vanadium complex. Drying the gel lignin-indium/vanadium complex overnight at 105 ℃ under nitrogen atmosphere, grinding the solid by using an agate mortar, and sieving the solid by a 360-mesh sieve to obtain lignin-indium/vanadium complex fine powder;
2. heating the lignin-indium/vanadium complex fine powder prepared in the step 1 to 280 ℃ at a speed of 25 ℃/min under the protection of nitrogen in a quartz tube electric furnace, cooling to room temperature, and grinding the solid by using an agate mortar to obtain a photocatalyst L/LnV-300;
3. fully mixing 5g of the photocatalyst L/InV-300 powder with the average particle size of 150nm prepared in the step 2 and 15g of gallium nitride powder with the average particle size of 150nm, placing the mixture into a quartz tube electric furnace, heating to 550 ℃ at a speed of 25 ℃/min under the protection of nitrogen, reacting for 30min, and naturally cooling to prepare the photocatalyst L/InV-GaN;
4. and 5g of the photocatalyst L/InV-GaN prepared in the step 3 and 100g of polypropylene melt-blown material are mixed and heated to 260 ℃, and melt-electrospinning is carried out under the conditions of 220 ℃ temperature, 18kV voltage, 18cm distance and 1.5mL/h injection rate to prepare the nanofiber membrane F.
Comparative example 4
A nanofiber membrane and a preparation method thereof comprise the following steps:
1. 20g of dried sodium lignin sulfonate and 3.5g of In (NO 3 ) 3 ·H 2 O、1.5g NH 4 VO 3 200mL of a 50% by mass aqueous solution of tetrahydrofuran was added thereto and stirred at room temperature for 1 hour, and then the mixed solution was heated to 130℃to prepare a gel-like lignin-indium/vanadium complex. Drying the gel lignin-indium/vanadium complex overnight at 105 ℃ under nitrogen atmosphere, grinding the solid by using an agate mortar, and sieving the solid by a 360-mesh sieve to obtain lignin-indium/vanadium complex fine powder;
2. heating the lignin-indium/vanadium complex fine powder prepared in the step 1 to 280 ℃ at a speed of 25 ℃/min under the protection of nitrogen in a quartz tube electric furnace, cooling to room temperature, and grinding the solid by using an agate mortar to obtain a photocatalyst L/LnV-300;
3. and 5G of the photocatalyst L/InV-300 powder with the average particle size of 150nm prepared in the step 2 and 100G of polypropylene melt-blown material are mixed and heated to 260 ℃, and melt-electrospinning is carried out under the conditions of 220 ℃ temperature, 18kV voltage, 18cm distance and 1.5mL/h injection rate, so as to prepare the nanofiber membrane G.
Formaldehyde removal performance test of materials
Preparing a test cabin: volume 3m 3 According to the test conditions of GB/T18801-2015, the test environment temperature is (25+/-2) DEG C, and the relative humidity is (50+/-10)%.
Air purifier preparation: 100g of each of the dried materials of examples 1 to 3 and comparative examples 1 to 4 was weighed, filled into an air purifier, and the materials were irradiated with a 40W fluorescent lamp to confirm whether the purifier was able to operate normally, and then placed into a test chamber after confirmation. The release amount of harmful substances in the purifier meets the regulations of GB4706.45 chapter 32 and GB21551.3-2010 chapter 4, namely the concentration of ozone (5 cm at the air outlet) is less than or equal to 0.10mg/m 3 The ultraviolet intensity (at 30cm around the device) is less than or equal to 5 mu/m 2 The concentration of the total volatile organic compounds (20 cm at the air outlet) is less than or equal to 0.15mg/m 3 PM10 concentration (20 cm at the air outlet) is less than or equal to 0.15mg/m 3 . And the actual measurement value of the standby power of the purifier is not more than 2.0W.
High concentration continuous test: after the purifier is placed in the test cabin, the cabin door is closed and openedStirring fan, dripping 38% formaldehyde into heater, and stabilizing formaldehyde concentration in test cabin at 5mg/m 3 And (3) starting the air purifier, wherein the test time is 1 hour, and recording the formaldehyde concentration in the test bin every 5 minutes. Stopping the purifier after 1 hour, and supplementing formaldehyde in the test cabin to 5mg/m 3 The test was repeated, and was performed 5 times in succession. The results are shown in FIGS. 2-8.
The formaldehyde concentration in the cabin was measured by a INTERSCAN4160-2 formaldehyde analyzer (Beijing Tianyun environmental protection technology Co., ltd.). The formaldehyde removal rate can be calculated by the following formula:
wherein q is the removal rate, c 0 C for initial formaldehyde concentration t Is the final formaldehyde concentration.
From fig. 2 to fig. 8, it can be known that the removal rate of the air-purifying PP nanofiber membrane prepared by the embodiment of the invention can reach more than 85% after the first high-concentration formaldehyde degradation test is performed for 1 hour, and the removal rate can also reach more than 80% after 5 experiments. The nanofiber membrane prepared in comparative examples 1-4 has the removal rate of only 50-60% in the first high-concentration formaldehyde degradation test for 1h, and the removal rate is reduced to 40-50% after 5 experiments. The main reason is that the high-efficiency visible light catalyst needs to react lignin sulfonate, indium nitrate and ammonium vanadate to obtain the indium vanadate photocatalyst, and under visible light, gallium nitride electron transfer and phenolic alcohol ketone interconstitution and free radical regeneration formed by the indium vanadate photocatalyst enable the fiber membrane material to have high photocatalytic efficiency.
The invention provides an air purifying PP nanofiber membrane, a method for preparing the same and a method for preparing the same, and the method for realizing the technical scheme is a plurality of methods and approaches, the method is only a preferred embodiment of the invention, and it is noted that a plurality of improvements and modifications can be made by one of ordinary skill in the art without departing from the principle of the invention, and the improvements and modifications are also considered as the protection scope of the invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (10)
1. The preparation method of the air purification PP nanofiber membrane is characterized by comprising the following steps of:
s1, drying sodium lignin sulfonate, in (NO 3 ) 3 ·H 2 O and NH 4 VO 3 Adding into 50% tetrahydrofuran water solution, stirring at room temperature until completely dissolving, heating to 110-150deg.C to obtain gel lignin-indium/vanadium complex, drying the gel lignin-indium/vanadium complex at 105deg.C under nitrogen atmosphere overnight, grinding, and sieving to obtain lignin-indium/vanadium complex fine powder;
s2, heating the lignin-indium/vanadium complex fine powder to 250-300 ℃ under the protection of nitrogen, cooling to room temperature, and grinding to obtain a photocatalyst L/InV-300;
s3, under the protection of nitrogen, fully mixing the photocatalyst L/InV-300 and gallium nitride powder, heating to 500-600 ℃ for reacting for 20-40min, and naturally cooling to obtain the high-efficiency photocatalyst L/InV-GaN;
s4, mixing and heating the high-efficiency photocatalyst L/InV-GaN and the polypropylene melt-blown material to 240-280 ℃, and carrying out melt electrostatic spinning to obtain the air purification PP nanofiber membrane.
2. The method according to claim 1, wherein In the step S1, sodium lignin sulfonate, in (NO 3 ) 3 ·H 2 O、NH 4 VO 3 And tetrahydrofuran aqueous solution in a ratio of (18-24) g (3-4) g (1-2) g:200mL.
3. The method according to claim 1, wherein in the step S1, the stirring time is 1h, and the sieving is performed by a 360 mesh sieve.
4. The method according to claim 1, wherein in the step S2, the temperature rising rate is 20 to 30 ℃.
5. The method according to claim 1, wherein in the step S3, the photocatalyst L/InV-300 has an average particle diameter of 100-200nm and the gallium nitride powder has an average particle diameter of 100-200nm.
6. The method according to claim 1, wherein in the step S3, the ratio of the photocatalyst L/InV-300 powder to the gallium nitride powder is 1:2-4.
7. The method according to claim 1, wherein in the step S3, the temperature rising rate is 20 to 30 ℃.
8. The method according to claim 1, wherein the ratio of the high-efficiency photocatalyst L/InV-GaN to the polypropylene melt-blown material in the step S4 is (3-8) g to 100g.
9. The method according to claim 1, wherein in the step S4, the conditions of melt electrospinning are a temperature of 200-240 ℃, a voltage of 15-20kV, a distance of 15-20cm, and an injection rate of 1-2mL/h.
10. The air-purifying PP nanofiber membrane prepared by the preparation method according to any one of claims 1 to 9.
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