CN108262039B - Manganese dioxide loaded fiber and preparation method and application thereof - Google Patents
Manganese dioxide loaded fiber and preparation method and application thereof Download PDFInfo
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- CN108262039B CN108262039B CN201810094142.7A CN201810094142A CN108262039B CN 108262039 B CN108262039 B CN 108262039B CN 201810094142 A CN201810094142 A CN 201810094142A CN 108262039 B CN108262039 B CN 108262039B
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- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 title claims abstract description 268
- 239000000835 fiber Substances 0.000 title claims abstract description 89
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 110
- 239000000843 powder Substances 0.000 claims abstract description 80
- 239000000725 suspension Substances 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims abstract description 12
- 230000001070 adhesive effect Effects 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 21
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 21
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 21
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 21
- 238000000227 grinding Methods 0.000 claims description 8
- 238000007598 dipping method Methods 0.000 claims description 7
- 238000007146 photocatalysis Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 230000001699 photocatalysis Effects 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 238000005286 illumination Methods 0.000 claims 1
- 238000002791 soaking Methods 0.000 abstract description 8
- 239000002657 fibrous material Substances 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 35
- 239000004372 Polyvinyl alcohol Substances 0.000 description 25
- 229920002451 polyvinyl alcohol Polymers 0.000 description 25
- 239000004744 fabric Substances 0.000 description 18
- 229920000742 Cotton Polymers 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 7
- 238000011068 loading method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 239000008098 formaldehyde solution Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 208000026935 allergic disease Diseases 0.000 description 1
- 230000007815 allergy Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 210000005260 human cell Anatomy 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 231100000225 lethality Toxicity 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003471 mutagenic agent Substances 0.000 description 1
- 231100000707 mutagenic chemical Toxicity 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000378 teratogenic Toxicity 0.000 description 1
- 230000003390 teratogenic effect Effects 0.000 description 1
- 238000009423 ventilation Methods 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
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- 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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- 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
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Abstract
The invention relates to the technical field of fiber materials, and provides a manganese dioxide loaded fiber, and a preparation method and application thereof. A preparation method of manganese dioxide loaded fiber comprises dissolving manganese dioxide powder and binder in water, and performing ultrasonic treatment to obtain uniformly dispersed suspension; the size of the manganese dioxide powder is less than 10 mu m, and the mass ratio of the manganese dioxide powder to the adhesive is 1: 50-100; placing the fiber in the suspension, soaking for 12-36h, and drying to obtain the fiber loaded with manganese dioxide; the mass ratio of the fibers to the manganese dioxide powder is 2-10: 1. The preparation method of the fiber loaded with manganese dioxide is simple and effective, and can well load the manganese dioxide on the fiber. The manganese dioxide loaded fiber is prepared by the preparation method of the manganese dioxide loaded fiber. The application of the manganese dioxide loaded fiber is to remove formaldehyde.
Description
Technical Field
The invention relates to the technical field of fiber materials, in particular to a manganese dioxide loaded fiber and a preparation method and application thereof.
Background
Formaldehyde has been identified by the world health organization as a carcinogenic and teratogenic substance, a recognized source of allergy, and also as one of the potentially strong mutagens. After formaldehyde enters a human body, the formaldehyde mainly damages DNA of human body cells to cause cell mutation; binds to amino groups of proteins in the human body, changes the internal structure of the proteins and coagulates, disturbing the normal metabolism of human cells, thereby generating lethality.
At present, aiming at indoor formaldehyde pollution treatment, a ventilation method, a plant decomposition method and the like are usually adopted, and although the method is simple and easy, the effect is not good.
Disclosure of Invention
The invention aims to provide a manganese dioxide loaded fiber, a preparation method and application thereof2And H2O, so that the formaldehyde remover can be placed indoors or made into household articles such as curtains and the like for removing formaldehyde.
In order to solve the technical problems, the invention adopts the following technical scheme. A preparation method of manganese dioxide loaded fiber comprises dissolving manganese dioxide powder and binder in water, and performing ultrasonic treatment to obtain uniformly dispersed suspension; the size of the manganese dioxide powder is less than 10 mu m, the adhesive is polyvinyl alcohol or sodium carboxymethyl cellulose, and the mass ratio of the manganese dioxide powder to the adhesive is 1: 50-100; placing the fiber in the suspension, soaking for 12-36h, and drying to obtain the fiber loaded with manganese dioxide; the mass ratio of the fibers to the manganese dioxide powder is 2-10: 1.
Preferably, the binder is polyvinyl alcohol, and the mass ratio of the manganese dioxide powder to the polyvinyl alcohol is 1: 60-100.
Preferably, the mass fraction of the polyvinyl alcohol is 2-8%.
Preferably, the adhesive is sodium carboxymethyl cellulose, and the mass ratio of the manganese dioxide powder to the sodium carboxymethyl cellulose is 1: 50-70.
Preferably, the mass fraction of the sodium carboxymethyl cellulose is 0.5 to 3%.
Preferably, the fibers are activated carbon fibers or electrostatic cotton fibers.
Preferably, the duration of the ultrasonic treatment is 20-60 min.
Preferably, the preparation method of the manganese dioxide supported fiber further comprises the preparation of manganese dioxide powder, and the manganese dioxide raw powder is ground to obtain the manganese dioxide powder with the size of less than 10 μm, and the grinding time is 6-8 h.
The manganese dioxide loaded fiber is prepared by the preparation method of the manganese dioxide loaded fiber.
The application of the manganese dioxide loaded fiber is to remove formaldehyde.
The invention has the beneficial effects that:
the invention provides a preparation method of manganese dioxide loaded fiber, which is simple and effective, and can well load manganese dioxide on the fiber, and the prepared manganese dioxide loaded fiber can decompose formaldehyde into harmless CO under the action of photocatalysis2And H2And O, the removal rate can reach 66%.
The invention also provides a fiber loaded with manganese dioxide, which can decompose formaldehyde into harmless CO under the photocatalysis2And H2And O, the removal rate can reach 66%.
The invention also provides application of the manganese dioxide loaded fiber, the manganese dioxide loaded fiber is applied to removing formaldehyde, for example, the fiber is placed indoors or made into household articles such as curtains, and the removal rate can reach 66%.
Drawings
Fig. 1 is a schematic flow chart of a method for preparing a manganese dioxide-loaded fiber according to the present invention.
FIG. 2 is an SEM image of manganese dioxide powder at different milling time periods; wherein a is an SEM picture of manganese dioxide powder ground for 2h, b is an SEM picture of manganese dioxide powder ground for 4h, and c is an SEM picture of manganese dioxide powder ground for 6 h.
Fig. 3 is an XRD pattern of manganese dioxide loaded fibers and manganese dioxide powder; wherein, curve a is the XRD pattern of the manganese dioxide loaded fiber provided by the invention, and curve b is the XRD pattern of the manganese dioxide powder.
FIG. 4 is a scanning electron microscope image of a manganese dioxide-loaded fiber; wherein a and b are images of the manganese dioxide loaded fiber under different magnification factors respectively, and the upper right corner of b is an energy spectrum analysis result at a square frame.
FIG. 5 is a schematic view of the structure of an apparatus used in the formaldehyde adsorption experiment.
Detailed Description
For those skilled in the art to more clearly understand the objects, technical solutions and advantages of the present invention, the following description will be further provided in conjunction with the accompanying drawings and examples.
Example one
As shown in fig. 1, a method for preparing a manganese dioxide-loaded fiber includes:
step S1: dissolving manganese dioxide powder and an adhesive in water, and performing ultrasonic treatment to obtain a uniformly dispersed suspension; the size of the manganese dioxide powder is less than 10 mu m, the adhesive is polyvinyl alcohol or sodium carboxymethyl cellulose, and the mass ratio of the manganese dioxide powder to the adhesive is 1 (50-100);
step S2: placing the fiber in the suspension, soaking for 12-36h, and drying to obtain the fiber loaded with manganese dioxide; the mass ratio of the fibers to the manganese dioxide powder is (2-10): 1.
Firstly, the preparation method of the manganese dioxide loaded fiber provided by the invention is simple and is beneficial to mass production; secondly, the size of the manganese dioxide powder is determined, so that the formaldehyde removal rate of the obtained manganese dioxide-loaded fiber can be ensured; furthermore, the impregnation time and the mass ratio of the manganese dioxide powder, the adhesive and the fiber are determined to ensure the loading effect and the loading rate of the manganese dioxide on the fiber; finally, the prepared manganese dioxide-loaded fiber can decompose formaldehyde into harmless CO under the photocatalysis effect2And H2And O, the removal rate can reach 66%.
Among them, manganese dioxide powder having a size of less than 10 μm can be purchased as it is, or can be prepared by crushing, grinding or the like of manganese dioxide raw powder. Preferably, the preparation method of the manganese dioxide supported fiber further comprises the preparation of manganese dioxide powder, and the manganese dioxide raw powder is ground to obtain the manganese dioxide powder with the size of less than 10 μm. As shown in fig. 2, fig. 2 is an SEM of manganese dioxide powder at different milling time periods; wherein a is an SEM picture of manganese dioxide powder ground for 2h, b is an SEM picture of manganese dioxide powder ground for 4h, and c is an SEM picture of manganese dioxide powder ground for 6 h. As can be seen from the figure, the manganese dioxide powder ground for 2 hours is large in size, and the maximum size is about 50 μm; the manganese dioxide powder milled for 4 hours was significantly smaller than the manganese dioxide powder milled for 2 hours, and had a size of about 20 μm; while manganese dioxide powder milled for 6 hours has become significantly smaller in size, having a size of less than 10 μm. Therefore, preferably, the length of time of the grinding is 6 to 8 hours.
In some embodiments, the binder is polyvinyl alcohol, and preferably, the mass ratio of the manganese dioxide powder to the binder is 1 (60-100), that is, the mass ratio of the manganese dioxide powder to the polyvinyl alcohol is 1 (60-100). And the loading effect of the manganese dioxide powder is ensured by determining the mass ratio of the manganese dioxide powder to the polyvinyl alcohol. It is further preferred that the mass ratio of manganese dioxide powder to polyvinyl alcohol is 1 (65-75), and in some embodiments, the mass ratio of manganese dioxide powder to polyvinyl alcohol is 1: 68. 1: 71.5 or 1: 73. when the mass fraction of polyvinyl alcohol is small, the loading rate of manganese dioxide powder is low, and when the mass fraction of polyvinyl alcohol is large, the loaded manganese dioxide powder is likely to be agglomerated, and therefore, it is preferable that the mass fraction of polyvinyl alcohol is 2 to 8%. More preferably, the polyvinyl alcohol is present in a mass fraction of 4-8%, and in some embodiments, the polyvinyl alcohol is present in a mass fraction of 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, or 7.5%.
In other embodiments, the binder is sodium carboxymethyl cellulose, and preferably, the mass ratio of the manganese dioxide powder to the binder is 1 (50-70), that is, the mass ratio of the manganese dioxide powder to the sodium carboxymethyl cellulose is 1 (50-70). The loading effect of the manganese dioxide powder is ensured by determining the mass ratio of the manganese dioxide powder to the sodium carboxymethyl cellulose. It is further preferred that the manganese dioxide powder to binder mass ratio is 1 (50-65), and in some embodiments, the manganese dioxide powder to binder mass ratio is 1: 52. 1: 55.5, 1: 58.5, 1:60 or 1: 63. when the mass fraction of sodium carboxymethyl cellulose is small, the loading rate of manganese dioxide powder is low, and when the mass fraction of sodium carboxymethyl cellulose is large, the loaded manganese dioxide powder is easily agglomerated, and therefore, it is preferable that the mass fraction of sodium carboxymethyl cellulose is 0.5 to 3%. More preferably, the sodium carboxymethyl cellulose has a mass fraction of 0.5 to 2%, and in some embodiments, the sodium carboxymethyl cellulose has a mass fraction of 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.5%, or 1.8%.
In step S1, in order to ensure that the suspension obtained by mixing the manganese dioxide powder and the binder is uniformly dispersed, the ultrasonic treatment is preferably performed for a period of 20 to 60 min. More preferably, the duration of the ultrasonic treatment is 25-45min, and in some specific embodiments, the duration of the ultrasonic treatment is 30 min. The ultrasonic wave is preferably output power of 500W and frequency of 40kHz, and suspension with good dispersibility can be obtained.
In step S2, the fibers are activated carbon fibers or electrostatic cotton fibers. The active carbon on the active carbon fiber has developed micropores and large specific surface area, and can adsorb formaldehyde, and the electrostatic cotton fiber can also play an adsorption role due to the surface static electricity, so that the contact area of manganese dioxide loaded on the electrostatic cotton fiber and formaldehyde can be increased, the catalytic reaction speed is accelerated, and the formaldehyde removal efficiency is improved. In some preferred embodiments, the fibers are pretreated before being placed in the suspension, that is, the preparation method of the manganese dioxide loaded fibers further comprises pretreating the fibers, wherein the pretreatment is to bake the fibers at 60-120 ℃ for 20-60min, so that impurities possibly existing in the fibers can be removed, the influence of the impurities on the loading effect of the manganese dioxide is avoided, and the formaldehyde removal performance of the finally prepared manganese dioxide loaded fibers is ensured.
Preferably, the mass ratio of the fibers to the manganese dioxide powder is (3-8): 1. Namely, the mass ratio of the manganese dioxide powder, the adhesive and the fiber is 1 (50-100) to 3-8. When the binder is polyvinyl alcohol, the mass ratio of the manganese dioxide powder to the binder to the fibers is 1 (60-100) to 3-8; when the adhesive is sodium carboxymethyl cellulose, the mass ratio of the manganese dioxide powder to the adhesive to the fiber is 1 (50-70) to 3-8.
Preferably, the dipping time is 18-30 hours, and in some embodiments, the dipping time is 24 hours. The drying is carried out for 1-3h at the temperature of 150-200 ℃, in particular for 1.5h at the temperature of 180 ℃. In some preferred embodiments, the soaking is performed simultaneously with the ultrasonic treatment, that is, in step S2, the fiber is placed in the suspension, and is soaked for 12-36 hours under the action of the ultrasonic wave and then dried to obtain the fiber loaded with manganese dioxide. The ultrasonic wave is preferably output power of 100-500W and frequency of 28-50 kHz. In some embodiments, the output power of the ultrasonic wave is 200W, the frequency is 28kHz, and the dipping time is 28 h; in other embodiments, the output power of the ultrasonic wave is 300W, the frequency is 50kHz, and the dipping time is 14 h; in still other embodiments, the ultrasonic waves have an output power of 400W and a frequency of 40kHz, and the immersion time is 24 hours.
Example two
A manganese dioxide-loaded fiber prepared using the method of preparing manganese dioxide-loaded fiber provided in example one.
As shown in fig. 3, fig. 3 is an XRD pattern of manganese dioxide loaded fibers and manganese dioxide powder; wherein curve a is an XRD pattern of the manganese dioxide supported fiber, and curve b is an XRD pattern of the manganese dioxide powder. As a result of comparison, the peak points of the two curves are almost identical, and characteristic diffraction peaks corresponding to the (311), (400), (440) and (622) crystal planes of γ -MnO2 appear at the 2 θ angles of 38.9 °, 45.2 °, 65.8 ° and 76.8 °, thus indicating that manganese dioxide is successfully loaded on the fiber.
As shown in fig. 4, fig. 4 is a scanning electron microscope image of the manganese dioxide-loaded fiber; wherein a and b are images of the manganese dioxide loaded fiber under different magnification factors respectively, and the upper right corner of b is an energy spectrum analysis result at a square frame. As can be seen from fig. 4, a certain number of particles are formed on the surface of the fiber, and the surface elements of the fiber are analyzed by the EDS energy spectrum of the scanning electron microscope, so that absorption peaks of Mn and O appear, and the particles can be surface-treated as manganese dioxide.
The manganese dioxide loaded fiber provided by the invention is prepared fromManganese dioxide is loaded on the catalyst, and formaldehyde can be decomposed into harmless CO under the action of photocatalysis2And H2And O, the formaldehyde can be effectively removed.
EXAMPLE III
The manganese dioxide-loaded fiber provided in the second embodiment is applied to formaldehyde removal, for example, the fiber is placed indoors or made into household articles such as curtains, and the removal rate can reach 66%.
Some experimental groups are provided below
(1) Weighing 40g MnO2Placing the original powder into a mortar, and forcibly grinding for 6 hours to obtain the required MnO2Powder is sealed and stored for later use;
(2) putting the activated carbon cloth into an oven, baking for 0.5h at 80 ℃, then shearing the activated carbon cloth with the thickness of 10cm by 10cm, and weighing 2.2305g by using an electronic analytical balance;
(3) 0.4461g of MnO as obtained in step (1) were weighed2Powder, 31.9149g of polyvinyl alcohol with a mass fraction of 5.5%, MnO2Adding the powder and polyvinyl alcohol into 500mL of water, uniformly stirring, and performing ultrasonic treatment for 30min to obtain a uniformly dispersed suspension, wherein the output power of ultrasonic waves is 500W, and the frequency is 40 kHz;
(4) and (3) putting the activated carbon cloth sheared in the step (2) into the suspension obtained in the step (3), putting the activated carbon cloth into an ultrasonic instrument for soaking, setting the output power of the ultrasonic instrument to be 400W and the frequency to be 40kHz, taking out the activated carbon cloth after soaking for 24h, putting the activated carbon cloth into an oven, and drying the activated carbon cloth for 90min at 180 ℃ to obtain the required manganese dioxide loaded fiber.
It is understood that the fibers in this experimental group are activated carbon fibers.
This experimental group differs from experimental group 1 in that: the mass fraction of polyvinyl alcohol used was 6%.
This experimental group differs from experimental group 1 in that: the mass fraction of polyvinyl alcohol used was 6.5%.
Experimental group 4
This experimental group differs from experimental group 1 in that: the mass fraction of polyvinyl alcohol used was 4.5%.
Experimental group 5
This experimental group differs from experimental group 1 in that: the mass of polyvinyl alcohol used was 30.3348 g.
Experimental group 6
This experimental group differs from experimental group 1 in that: the mass of polyvinyl alcohol used was 32.5653 g.
Experimental group 7
This experimental group differs from experimental group 1 in that: in the step (4), the output power of the ultrasonic instrument is 200W, and the frequency is 28 kHz.
Experimental group 8
(1) Weighing 40g MnO2Placing the original powder into a mortar, and forcibly grinding for 6 hours to obtain the required MnO2Powder is sealed and stored for later use;
(2) putting the activated carbon cloth into an oven, baking for 0.5h at 80 ℃, then shearing the activated carbon cloth with the thickness of 10cm by 10cm, and weighing 2.2305g by using an electronic analytical balance;
(3) 0.4461g of MnO as obtained in step (1) were weighed2Powder, 26.0969g sodium carboxymethylcellulose with a mass fraction of 0.9%, MnO2Adding the powder and sodium carboxymethyl cellulose into 500mL of water, uniformly stirring, and performing ultrasonic treatment for 30min to obtain a uniformly dispersed suspension, wherein the output power of ultrasonic waves is 500W, and the frequency is 40 kHz;
(4) and (3) putting the activated carbon cloth sheared in the step (2) into the suspension obtained in the step (3), putting the activated carbon cloth into an ultrasonic instrument for soaking, setting the output power of the ultrasonic instrument to be 200W and the frequency to be 28kHz, taking out the activated carbon cloth after soaking for 28h, putting the activated carbon cloth into an oven, and drying the activated carbon cloth for 90min at 180 ℃ to obtain the required manganese dioxide loaded fiber.
Experimental group 9
This experimental group differs from experimental group 8 in that: the mass fraction of sodium carboxymethylcellulose used was 0.7%.
This experimental group differs from experimental group 8 in that: the mass fraction of sodium carboxymethylcellulose used is 1%.
This experimental group differs from experimental group 8 in that: in the step (4), the output power of the ultrasonic instrument is 400W, and the frequency is 40 kHz.
Experimental group 12
This experimental group differs from experimental group 1 in that: electrostatic cotton cloth was used. The method comprises the following specific steps:
(1) weighing 40g MnO2Placing the original powder into a mortar, and forcibly grinding for 6 hours to obtain the required MnO2Powder is sealed and stored for later use;
(2) placing the electrostatic cotton cloth in an oven, baking for 0.5h at 80 ℃, then shearing 10cm by 10cm electrostatic cotton cloth, and weighing 2.2245g by using an electronic analytical balance;
(3) 0.4449g of MnO as obtained in step (1) were weighed2Powder, 31.8104g of polyvinyl alcohol with a mass fraction of 5.5%, MnO2Adding the powder and polyvinyl alcohol into 500mL of water, uniformly stirring, and performing ultrasonic treatment for 30min to obtain a uniformly dispersed suspension, wherein the output power of ultrasonic waves is 500W, and the frequency is 40 kHz;
(4) and (3) placing the electrostatic cotton cloth sheared in the step (2) into the suspension obtained in the step (3), placing the suspension into an ultrasonic instrument for dipping, setting the output power of the ultrasonic instrument to be 400W and the frequency to be 40kHz, taking out the suspension after dipping for 24 hours, placing the suspension into an oven, and drying the suspension for 90min at 180 ℃ to obtain the required manganese dioxide loaded fiber.
It is understood that the fibers in this experimental group were electrostatic cotton fibers.
The experimental conditions of the above experimental groups are summarized as follows:
since the experimental group 1 and the experimental group 10 are the fiber mass obtained by accurate measurement in the above experimental group, and the experimental groups 2 to 9 use the data in the experimental group 1, however, the cut fiber size is consistent in the experiment, and it can be understood that the error of the fiber mass is within 3%.
Formaldehyde adsorption experiment aiming at the experimental group
As shown in fig. 5, the formaldehyde adsorption experiment is performed in a sealed box 1, a formaldehyde pollution source 2 and a formaldehyde detector 3 are arranged in the box 1, ultraviolet light is provided during testing, a sample is placed between the formaldehyde pollution source 2 and the formaldehyde detector 3, and the indication change of the formaldehyde detector is observed and recorded, so that the removal rate is calculated. The formaldehyde contamination source 2 includes a petri dish and 160ppm formaldehyde solution. In the experiment, 3 drops of formaldehyde solution with the concentration of 160ppm are uniformly dropped on a culture dish to form a formaldehyde pollution source, and simultaneously, a sample is placed in the culture dish and a formaldehyde detector is opened.
The formaldehyde concentrations in the box after 30min of the blank experiment and the experimental group are respectively obtained, and the removal rate is calculated, as shown in the following table:
the removal rate was calculated based on the formaldehyde concentration of the blank group, and the removal rate of the blank group was (2-0.68)/2 was 66%.
According to results of formaldehyde adsorption experiments, the removal rate of formaldehyde of the manganese dioxide-loaded fiber provided by the invention can reach 66% after 30min under indoor closed conditions.
Claims (3)
1. The application of the manganese dioxide loaded fiber is characterized in that: the fiber loaded with manganese dioxide removes gas formaldehyde under the photocatalysis;
the preparation method of the manganese dioxide loaded fiber comprises the steps of dissolving manganese dioxide powder and a binding agent in water, and carrying out ultrasonic treatment to obtain a uniformly dispersed suspension; the size of the manganese dioxide powder is less than 10 mu m, the adhesive is sodium carboxymethyl cellulose, the mass fraction of the sodium carboxymethyl cellulose is 0.5-3%, and the mass ratio of the manganese dioxide powder to the sodium carboxymethyl cellulose is 1: 50-70;
placing the fiber in the suspension, dipping the fiber for 12-36h under the action of ultrasonic waves with the output power of 100-500W and the frequency of 28-50kHz, and drying to obtain the fiber loaded with manganese dioxide; the mass ratio of the fibers to the manganese dioxide powder is 2-10: 1;
the fiber is activated carbon fiber; removing gas formaldehyde under the condition of providing ultraviolet illumination; the duration of the ultrasonic treatment is 20-60 min.
2. Use of manganese dioxide loaded fibers according to claim 1, wherein: the time for removing the gas formaldehyde under the photocatalysis is 30 min.
3. Use of manganese dioxide loaded fibers according to any one of claims 1-2, characterized in that: further comprising the preparation of manganese dioxide powder, grinding the manganese dioxide raw powder to obtain manganese dioxide powder with the size of less than 10 μm, wherein the grinding time is 6-8 h.
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| CN113058657A (en) * | 2021-04-02 | 2021-07-02 | 四方光电股份有限公司 | Formaldehyde decomposition felt and preparation method thereof |
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| CN106140090A (en) * | 2016-08-31 | 2016-11-23 | 南京尚易环保科技有限公司 | A kind of MnO for removing indoor formaldehyde2aCF material and preparation method thereof |
| CN107029702A (en) * | 2017-04-24 | 2017-08-11 | 中国科学院上海硅酸盐研究所 | Load carbon fiber felt catalyst material of manganese oxide and its preparation method and application |
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| CN107029702A (en) * | 2017-04-24 | 2017-08-11 | 中国科学院上海硅酸盐研究所 | Load carbon fiber felt catalyst material of manganese oxide and its preparation method and application |
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