WO2019227872A1 - Formaldehyde purification fiber and preparation method therefor - Google Patents

Abstract

Provided is a method for preparing a formaldehyde purification fiber, the method involving dissolving a first polymer in an organic solvent to formulate a first spinning solution, and carrying out electrostatic spinning and vacuum drying on same, and then placing same in a dopamine modification solution for soaking, and washing same so as to obtain a first polymer fiber; or, dissolving a second polymer in an organic solvent to formulate a second spinning solution, and carrying out electrostatic spinning and UV irradiation on same so as to obtain a second polymer fiber; and placing the first polymer fiber and/or the second polymer fiber into a solution containing noble metal ions for soaking so as to combine the first polymer fiber and/or the second polymer fiber with the noble metal ions; then placing same into a sodium borohydride solution for soaking so as to convert the noble metal ions into a noble metal elementary substance or a noble metal compound, subsequently removing same and washing same to obtain the formaldehyde purification fiber. The fiber has a light mass, good air permeability, high stability, and a high loading capacity, and can be used as a catalyst for catalyzing the conversion of formaldehyde, and can achieve a high formaldehyde conversion rate by means of absorbing a small amount of active components.

Description

Formaldehyde purification fiber and preparation method thereof

The present invention claims the priority of an earlier application with an application number of 201810551037.1 with the invention name “A formaldehyde purification fiber and a preparation method thereof” submitted on May 31, 2018, and the contents of the foregoing earlier application are incorporated into this text by way of introduction. in.

Technical field

The invention relates to the technical field of formaldehyde removal, in particular to a formaldehyde purification fiber and a preparation method thereof.

Background technique

Formaldehyde is one of the most common indoor pollutants. Prolonged inhalation of formaldehyde can cause great harm to human health. Existing formaldehyde purification methods mainly include adsorption method, photocatalytic oxidation method, and catalytic combustion method. Among them, the adsorption method cannot degrade formaldehyde. When the temperature changes, the adsorbed formaldehyde will desorb and cause secondary pollution; the photocatalytic technology requires a specific light source, and the light utilization rate is low, which can cause secondary pollution during the removal process, and The cost of catalytic equipment is high and it is difficult to popularize and apply it on a large scale. Therefore, the currently used formaldehyde purification method is mainly catalytic combustion.

Catalytic combustion is also known as flameless combustion. The essence of catalytic combustion is to decompose formaldehyde into water and carbon dioxide by catalytic oxidation reaction. There is no secondary pollution of the product, and formaldehyde can be removed. The key is to build a suitable catalyst. The catalyst is composed of two main components: an active component and a support. The active component is mostly a noble metal and is supported on the support. The support is the backbone of the entire catalyst and has the function of supporting and dispersing the active component. It gives the catalyst certain strength and heat resistance Sex. Proper treatment of the support can also improve some physical properties of the catalyst and thus affect the performance of the catalyst. Appropriate support can reduce the amount of active components, improve catalyst performance, and reduce catalyst cost. The commonly used carriers for the catalyst include magnesium oxide, alumina, silica, transition metal oxides, etc. In recent years, there have also been some carriers prepared by special methods, such as preparing carriers into nanorods, nanospheres, or nanoporous materials. However, the above-mentioned carriers all exist in the form of powder or nanoparticles, which are easy to cause dust pollution in daily life, have a heavy weight, and need to carry more active components. Therefore, there is a need for a formaldehyde removal catalyst that can avoid dust pollution, is light in weight and low in cost.

Summary of the Invention

In view of this, the present invention provides a formaldehyde purification fiber as a catalyst for catalyzing the conversion of formaldehyde into water and carbon dioxide, avoiding dust pollution caused by powdery catalysts, and at the same time, the formaldehyde purification fiber is environmentally friendly, light in weight, good in permeability and stable. High performance, high loading capacity, high formaldehyde conversion can be achieved by adsorbing a small amount of active components, and the preparation cost is low. It has a wide application prospect in the removal of methanol.

In a first aspect, the present invention provides a method for preparing formaldehyde purification fibers, including:

Dissolving the first polymer in an organic solvent to prepare a first spinning solution, subjecting it to electrostatic spinning, vacuum drying, and soaking in a dopamine modified solution to obtain a first polymer fiber after washing;

Or the second polymer is dissolved in an organic solvent to prepare a second spinning solution, and the second polymer fiber is obtained after electrostatic spinning and ultraviolet light; wherein the first polymer includes polymethyl methacrylate, At least one of polyacrylonitrile and polyvinylidene fluoride, and the second polymer includes polyvinylpyrrolidone;

Immersing the first polymer fiber and / or the second polymer fiber in a solution containing noble metal ions, so that the first polymer fiber and / or the second polymer fiber are combined with the noble metal Ion, and then immersing the first polymer fiber and / or the second polymer fiber in a sodium borohydride solution to convert the noble metal ion into a noble metal element or a noble metal compound, and then take out and wash to obtain formaldehyde Purify the fiber.

In the present invention, when a polymer containing at least one of polymethyl methacrylate, polyacrylonitrile, and polyvinylidene fluoride is dissolved in an organic solvent to prepare a first spinning solution, it is necessary to undergo electrostatic spinning. After vacuum drying and soaking the dopamine modified solution, a first polymer fiber is obtained.

In the present invention, when polyvinylpyrrolidone or polyvinylpyrrolidone is dissolved in an organic solvent together with other polymers to prepare a second spinning solution, it needs to undergo electrostatic spinning and ultraviolet light to undergo a crosslinking reaction to obtain a second polymerization.物 材料。 Fibers. Specifically, the second spinning solution may be, but is not limited to, a polyvinylpyrrolidone solution, or a mixed solution of polyvinylpyrrolidone and polyacrylonitrile, or a mixed solution of polyvinylpyrrolidone and polyvinylidene fluoride, or polyvinylpyrrolidone and polymethacrylic acid. In the case of a methyl ester mixed solution, ultraviolet light is required after electrospinning to obtain a second polymer fiber.

Optionally, the organic solvent includes at least one of dimethyl sulfoxide, chloroform, N, N-dimethylformamide, and N, N-dimethylacetamide.

Optionally, the mass concentration of the first polymer in the first spinning solution is 15% -40%. Further optionally, the mass concentration of the first polymer in the first spinning solution is 20% -35%. Specifically, the mass concentration of the first polymer in the first spinning solution may be, but is not limited to, 20%, 27%, 30%, or 35%. When the first polymer is two or more of polymethyl methacrylate, polyacrylonitrile, and polyvinylidene fluoride, the mass ratio of the two or more polymers is not limited, and two or more The total mass concentration of the polymer is 15% -40%.

Optionally, the electrostatic spinning includes dry spinning, wet spinning, or dry-wet spinning.

Optionally, the spinning temperature of the electrostatic spinning is 20 ° C-35 ° C, the humidity is 20% -80%, and the injection speed is 0.4mL / h-1.8mL / h.

Optionally, the anode voltage of the electrostatic spinning is 8kV-25kV, the cathode voltage is (-4) kV-(-2) kV, and the rotation speed of the roller is 50 revolutions / min-200 revolutions / min.

Optionally, the vacuum drying temperature is 40 ° C-80 ° C, and the time is 6h-24h.

Optionally, the modified dopamine solution includes an aqueous solution containing anhydrous ethanol, ammonia, and dopamine hydrochloride. Further optionally, the modified dopamine solution contains 5 mL-15 mL of absolute ethanol, 0.3 mL-0.8 mL of ammonia water, 0.05 g-0.25 g of dopamine hydrochloride, and 15 mL-25 mL of distilled water.

Optionally, the immersion temperature in the dopamine modified solution is 15 ° C-35 ° C, and the immersion time is 6h-24h. Further optionally, the immersion in the dopamine modification solution further includes immersion in a dopamine modification solution at a rotation speed of 50 rpm to 150 rpm.

In the present invention, when the fiber obtained by electrospinning the first spinning solution is placed in a dopamine modification solution, dopamine self-polymerizes on the fiber surface, and the first polymer fiber is a polydopamine-encapsulated fiber, polydopamine The surface has a large number of oxygen and nitrogen coordination atoms for chelating precious metal ions.

Optionally, the first polymer fiber obtained after washing includes: washing multiple times with water until the aqueous solution is colorless, and immersing in an isopropanol solution for 10min-30min, and washing with water for 3-5 times, The first polymer fiber is obtained. Further optionally, the mass concentration of isopropanol in the isopropanol solution is 15% -30%. In the present invention, an isopropanol solution is used to remove unreacted dopamine on the fibers.

Optionally, the mass concentration of the second polymer in the second spinning solution is 15% -40%. Further optionally, the mass concentration of the second polymer in the second spinning solution is 15% -35%. Specifically, the mass concentration of the second polymer in the second spinning solution may be, but is not limited to, 15%, 20%, 27%, or 30%. When the second polymer is a mixture of polyvinylpyrrolidone and one or more other polymers, the mass ratio of polyvinylpyrrolidone to other one or more polymers is not limited, and polyvinylpyrrolidone and other one or more polymers are not limited. The total mass concentration of this polymer is 15% -40%.

Alternatively, the UV irradiation under irradiation 2h-12h / cm ² intensity of ultraviolet light at 10μW / cm ² -100μW. In the present invention, the fibers obtained by electrospinning the second spinning solution are crosslinked under ultraviolet light to obtain the second polymer fibers.

Optionally, the concentration of the precious metal ion in the precious metal ion-containing solution is 0.01 mol / L to 2 mol / L, and the pH of the precious metal ion-containing solution is 2-6. The precious metal ion-containing solution includes a precious metal cation-containing solution and / or a precious metal salt anion-containing solution. Specifically, the precious metal may be, but is not limited to, platinum, nickel, gold, palladium, ruthenium, rhodium, and silver. Specifically, the precious metal-containing ion may be, but is not limited to, a nickel ion, a platinum ion, and / or a cobalt ion. When the solution of the active component contains platinum ions and / or nickel ions, the molar concentration of the platinum ions is 0.03mol / L-0.05mol / L, and the molar concentration of the nickel ions is 0.03mol / L-1mol / L. In the present invention, when the first polymer fiber and / or the second polymer fiber are immersed in a solution containing platinum ions and nickel ions and reduced by sodium borohydride, the first polymer fiber And / or the surface of the second polymer fiber is platinum-nickel composite nanoparticles, the platinum-nickel composite nanoparticles have nickel as the core and platinum as the shell. In the present invention, the noble metal ion-containing solution may further include a transition metal ion. The transition metal can be, but is not limited to, manganese, zinc, and iron. In the present invention, if the noble metal ion-containing solution contains two or more precious metal ions, the first polymer fiber and / or the second polymer fiber may be placed in a solution containing two or more precious metal The ions are immersed in the solution, or the first polymer fiber and / or the second polymer fiber are sequentially immersed in a solution containing a single precious metal ion.

Optionally, the immersion temperature in the solution containing noble metal ions is 15 ° C-35 ° C, and the immersion time is 24h-144h. Further optionally, the immersion in the solution containing noble metal ions further includes immersion in the solution containing noble metal ions under the condition of a rotation speed of 50 rpm-150 rpm.

Optionally, the molar concentration of the sodium borohydride solution is 0.0001 mol / L-0.1 mol / L.

Optionally, the immersion temperature of the immersion in the sodium borohydride solution is 15 ° C-35 ° C, and the immersion time is 0.5h-7h. Further optionally, the immersion in the sodium borohydride solution further includes immersion in a sodium borohydride solution at a rotation speed of 50 rpm to 150 rpm.

The method for preparing formaldehyde purification fiber provided by the first aspect of the present invention uses electrostatic spinning to prepare light-weight and air-permeable fibers, and then increases the original fiber characteristics by vacuum drying, dopamine modification, or ultraviolet light. The adsorption of noble metal ions by the fiber can be carried, so that the noble metal ions can be loaded with a high load. After the reduction of sodium borohydride solution, the formaldehyde purification fiber can be prepared, which can be used as a catalyst for decomposing formaldehyde. The preparation process is simple and the cost is low, which is beneficial to industrial production .

In a second aspect, the present invention provides a formaldehyde purification fiber, which is prepared by the method for preparing a formaldehyde purification fiber according to the first aspect.

Optionally, the diameter of the formaldehyde purification fiber is 700 nm-1300 nm.

Optionally, the linear density of the formaldehyde purification fiber is 1.01dtex-1.44dtex, the breaking strength is 7.3cN / dtex-7.9cN / dtex, and the breaking elongation is 5% -30%.

Optionally, the conversion rate of the formaldehyde purification fiber to formaldehyde is higher than 93%.

Specifically, the formaldehyde purification fiber can be used in, but not limited to, civil or industrial air filtering equipment, including masks, air conditioners, air purifiers, and filter elements thereof.

The formaldehyde purification fiber provided by the second aspect of the present invention can be used as a catalyst for catalyzing the decomposition of formaldehyde, so that methanol is converted into water and carbon dioxide, thereby removing formaldehyde, and the product is not polluted. At the same time, the formaldehyde purification fiber avoids dust pollution caused by the dust catalyst. Green environmental protection, light weight, good air permeability, high stability, high load capacity, and efficient absorption of formaldehyde can be achieved by adsorbing a small amount of precious metals.

The beneficial effects of the present invention:

(1) The present invention provides a method for preparing formaldehyde-purified fibers. Light-weight and air-permeable fibers are prepared by electrostatic spinning, followed by vacuum drying, dopamine modification, or ultraviolet light. The basis for maintaining the original fiber characteristics It increases the fiber's adsorption of noble metal ions, so that it can carry noble metal ions, and finally it is reduced by sodium borohydride solution to obtain formaldehyde purified fiber. The preparation process is simple and the cost is low, which is conducive to industrial production;

(2) The formaldehyde purification fiber provided by the present invention can be used as a catalyst for catalyzing the decomposition of formaldehyde, so that methanol is converted into water and carbon dioxide, thereby removing formaldehyde, and the product is not polluted; at the same time, the formaldehyde purification fiber avoids dust pollution caused by dust catalyst, green Environmental protection, light weight, good air permeability, high stability, high load capacity, adsorption of a small amount of precious metals can achieve efficient formaldehyde conversion efficiency, and has broad application prospects in the removal of formaldehyde.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present invention or the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

FIG. 1 is an electron micrograph of a formaldehyde purification fiber prepared in Example 1 of the present invention; FIG.

FIG. 2 is a transmission electron microscope image of the formaldehyde-purified fiber prepared in Example 1 of the present invention. FIG. 2 (a) is a transmission electron microscope image at a scale of 0.2 μm, and FIG. 2 (b) is a transmission electron microscope at a scale of 50 nm. Figure;

3 is a diameter analysis chart of surface nanoparticles of the formaldehyde purification fiber prepared in Example 1 of the present invention;

4 is an electron micrograph of a polymethyl methacrylate fiber prepared in Comparative Example 1;

FIG. 5 is a diagram showing the stability test results of the formaldehyde purification fiber prepared in Example 1 of the present invention; FIG.

FIG. 6 is a diagram of the efficiency of formaldehyde decomposition of the formaldehyde purification fiber prepared in Example 1 of the present invention at different gas flow rates.

Detailed ways

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

A method for preparing formaldehyde purification fiber includes:

Polymethyl methacrylate was dissolved in N, N-dimethylformamide (DMF) to prepare a spinning solution. The mass concentration of polymethyl methacrylate in the spinning solution was 30%. Spinning and drying under vacuum for 6 h to obtain white polymethyl methacrylate fibers.

Mix 22.5mL of distilled water, 10mL of absolute ethanol, 0.5mL of ammonia, and 0.125g of dopamine hydrochloride to prepare a dopamine modified solution. Put the polymethyl methacrylate fiber in the dopamine modification, and soak it in a shaker at room temperature for 12h. Under alkaline conditions, dopamine undergoes oxidative self-polymerization on the fibers, washed with water until the aqueous solution is colorless, and then immersed in a 15% isopropyl alcohol aqueous solution for 20 minutes to remove unreacted dopamine, and rinsed with water 3-5 times The lyophilizer can be lyophilized to obtain black polydopamine-coated polymethyl methacrylate fibers.

Chloroplatinic acid and nickel nitrate were dissolved in water and mixed to prepare a solution. The molar concentration of platinum ions was 0.0494 mol / L, the molar concentration of nickel ions was 0.12 mol / L, the pH of the solution was 3.5, and the polydopamine-coated The polymethyl methacrylate fiber was placed therein, soaked in a shaker at room temperature for 72 hours, and then immersed in a 0.0005mol / L sodium borohydride solution for 3 hours, washed and dried to obtain formaldehyde-purified fibers. The obtained formaldehyde purification fiber was scanned by an electron microscope, and the result is shown in FIG. 1. It can be seen that the diameter of the formaldehyde purification fiber is 1100 nm-1200 nm. Polydopamine particles are attached to the surface of the fiber, and the surface is rough. Polydopamine is evenly wrapped on the surface of the fiber to form a layer of polydopamine. The particles on the surface of the fiber are polydopamine particles that have not yet grown along the fiber. At the same time, through energy spectrum scanning, it was found that platinum and nickel nanoparticles were uniformly attached to the surface of the formaldehyde purification fiber. Transmission electron microscopy was performed on the prepared formaldehyde-purified fibers. The results are shown in Figure 2. It was found that the surface of the polymethyl methacrylate fiber was covered with a layer of black dopamine ((a) in Figure 2), and the dopamine shell was attached to the shell. Nanoparticles ((b) in Figure 2). The attached nanoparticles were analyzed and found to be composite nanoparticles with nickel as the core and platinum as the shell. The diameters of 200 nanoparticles were measured. The results are shown in Figure 3. The average diameter of the nanoparticles is 2.14 nm, and the diameter is very small, which makes the nanoparticles have higher catalytic activity.

Example 2

A method for preparing formaldehyde purification fiber includes:

Polymethyl methacrylate and polyvinylidene fluoride are dissolved in N, N-dimethylformamide (DMF) to prepare a spinning solution, wherein the mass concentration of polymethyl methacrylate in the spinning solution is 15%, The mass concentration of polyvinylidene fluoride is 20%. Spinning was performed on an electrostatic spinning machine. Electrostatic spinning parameters were: anode voltage 8 kV, cathode voltage-4 kV, injection speed 0.4 ml / h, rotation speed 60 rpm, spinning temperature 20 ° C, humidity 40%. The spun fibers were dried under vacuum at 50 ° C. for 7 hours to obtain polymethyl methacrylate fibers.

Mix 15 mL of distilled water, 5 mL of absolute ethanol, 0.3 mL of ammonia, and 0.05 g of dopamine hydrochloride to prepare a dopamine modified solution. Put the polymethyl methacrylate fiber in the dopamine modification, soak it in room temperature for 24 hours, and wash it with water. After the aqueous solution is colorless, immerse it in a 20% isopropyl alcohol aqueous solution for 30 minutes to remove unreacted dopamine, rinse with water for 3-5 times, and freeze dry with a lyophilizer to obtain polydopamine coated polymethacrylic acid Methyl ester fiber.

Nickel nitrate was dissolved in water and mixed to prepare a solution, wherein the molar concentration of nickel ions was 0.03 mol / L. The polydopamine-coated polymethyl methacrylate fiber was placed therein, and after soaking at room temperature for 96 hours, it was soaked in a 0.003mol / L sodium borohydride solution, and the formaldehyde purified fiber was obtained after washing and drying. After testing, the linear density of the formaldehyde-purified fiber was 1.3 dtex, the breaking strength was 7.8 cN / dtex, and the elongation at break was 20%.

Example 3

A method for preparing formaldehyde purification fiber includes:

The polyvinylpyrrolidone and polyvinylidene fluoride are mixed at a ratio of 3: 2 by mass and dissolved in chloroform to prepare a spinning solution, wherein the mass concentration of the polyvinylpyrrolidone in the spinning solution is 10%. Spinning was performed on an electrostatic spinning machine. The electrostatic spinning parameters were: anode voltage 25 kV, cathode voltage-2 kV, injection speed 1 ml / h, rotation speed 180 rpm, spinning temperature 30 ° C, humidity 60%. After spinning, the fiber was irradiated with ultraviolet light at 50 μW / cm ² for 4 hours, and then subjected to a crosslinking reaction to obtain a second polymer fiber.

A chloroplatinic acid solution was prepared, in which the molar concentration of platinum ions was 0.035 mol / L. The second polymer fiber was placed therein, soaked in a shaker at room temperature for 80 hours, and then soaked in a 0.03mol / L sodium borohydride solution. After washing and drying, formaldehyde-purified fibers were obtained. After testing, the linear density of the formaldehyde purification fiber was 1.2 dtex, the breaking strength was 7.4 cN / dtex, and the breaking elongation was 10%.

Comparative Example 1

Polymethyl methacrylate was dissolved in N, N-dimethylformamide (DMF) to prepare a spinning solution. The mass concentration of polymethyl methacrylate in the spinning solution was 30%. Spinning and drying under vacuum for 6 h to obtain white polymethyl methacrylate fibers. The obtained polymethyl methacrylate fiber was scanned by an electron microscope, and the result is shown in FIG. 4. The surface of the prepared polymethyl methacrylate fiber was smooth, and the fiber morphology was uniform and stable, with a diameter of 700 nm-850 nm. Compared with the formaldehyde purification fiber prepared in Example 1, it can be seen that after the polymethyl methacrylate fiber is coated with dopamine, the fiber diameter increases and the surface becomes rough.

In order to prove the beneficial effects of the present invention, the following effect examples are performed:

Effect Example 1

The formaldehyde purification fiber prepared in Example 1 was tableted and pulverized into particles. After passing through a 50-mesh sieve, 0.03 g was filled into a quartz tube with an inner diameter of 7 mm, and a small amount of quartz cotton was fixed at the position. The quartz tube was fixed in the reactor. .

A 200mg / L formaldehyde solution was prepared and transferred to a bubbler in an ice-water bath incubator. N _{2 was} used as a carrier gas, and the formaldehyde gas was taken out by the bubbling. It was mixed with the diluent air into the quartz tube in the reactor. Measure the concentration of formaldehyde in the gas before and after passing through the quartz tube, and calculate the efficiency of the formaldehyde purification fiber to convert formaldehyde according to formula (1). Among them, the method for measuring the concentration of formaldehyde refers to the national standard "Method for measuring formaldehyde in air in public places" (GB / T18204.26- In the phenol reagent spectrophotometry in 2000), C ₀ is the concentration of formaldehyde in the mixed gas passed into the quartz tube, and C ₁ is the concentration of formaldehyde in the mixed gas after passing through the quartz tube.

It was determined that the content of formaldehyde in the mixed gas flowing into the quartz tube was 3 mg / L. When the air flow rate was 30 ml / min, the final formaldehyde conversion rate reached 99.8%.

Effect Example 2

Under the same conditions as in Effect Example 1, the quartz tube containing the formaldehyde purification fiber was continuously fed with a mixed gas, and the stability of the formaldehyde purification fiber was measured. The results are shown in Fig. 5. In 408h, the mixed gas was continuously introduced (the content of formaldehyde was 3mg / L and the air flow rate was 30ml / min). The conversion rate of formaldehyde remained above 95%, and the overall conversion level remained high. It is shown that the formaldehyde purification fiber prepared by the present invention has high stability and can be reused.

Effect Example 3

Same conditions as in Effect Example 1, a mixed gas (formaldehyde content of 3 mg / L) was continuously introduced into the quartz tube containing the formaldehyde purification fiber, the flow rate of the gas was changed, and the influence on the performance of the formaldehyde purification fiber was observed. The results are shown in Figure 6. When the gas flow rate is lower than 70ml / min, the conversion rate of formaldehyde remains above 97%. When the gas flow rate is higher than 70ml / min, the conversion rate of formaldehyde decreases slightly, but still remains above 93%, indicating that The formaldehyde purification fiber prepared by the invention can maintain a high formaldehyde conversion rate under various air flow conditions, and has a wide application prospect.

Therefore, based on the results of the above-mentioned effect examples, it can be seen that the formaldehyde purification fiber provided by the present invention is environmentally friendly, light in weight, good in breathability, high in stability, has excellent ability to remove formaldehyde, and has a broad application prospect in the removal of formaldehyde.

The above is a preferred embodiment of the present invention, but it cannot be understood as a limitation on the scope of the patent of the present invention. It should be noted that, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches are also considered as the protection scope of the present invention.

Claims (10)

1. A method for preparing formaldehyde purification fiber, comprising:

   Dissolving the first polymer in an organic solvent to prepare a first spinning solution, subjecting it to electrostatic spinning, vacuum drying, and soaking in a dopamine modified solution to obtain a first polymer fiber after washing;

   Or the second polymer is dissolved in an organic solvent to prepare a second spinning solution, and the second polymer fiber is obtained after electrostatic spinning and ultraviolet light; wherein the first polymer includes polymethyl methacrylate, At least one of polyacrylonitrile and polyvinylidene fluoride, and the second polymer includes polyvinylpyrrolidone;

   Immersing the first polymer fiber and / or the second polymer fiber in a solution containing noble metal ions, so that the first polymer fiber and / or the second polymer fiber are combined with the noble metal Ion, and then immersing the first polymer fiber and / or the second polymer fiber in a sodium borohydride solution to convert the noble metal ion into a noble metal element or a noble metal compound, and then take out and wash to obtain formaldehyde Purify the fiber.
2. The method of claim 1, wherein the dopamine modification liquid comprises an aqueous solution containing anhydrous ethanol, ammonia, and dopamine hydrochloride.
3. The method for preparing formaldehyde-purified fiber according to claim 2, wherein the dopamine modified solution comprises 5mL-15mL of absolute ethanol, 0.3mL-0.8mL of ammonia, 0.05g-0.25g of dopamine hydrochloride, and 15mL-25mL Distilled water.
4. The method for preparing formaldehyde purification fiber according to claim 1, wherein the soaking temperature in the dopamine modified solution is 15 ° C-35 ° C, and the soaking time is 6h-24h.
5. The method for preparing formaldehyde purification fiber according to claim 1, wherein the concentration of the precious metal ions in the precious metal ion-containing solution is 0.01 mol / L-2 mol / L, The pH is 2-6; the molar concentration of the sodium borohydride solution is 0.0001mol / L-0.1mol / L.
6. The method of claim 1, wherein the mass concentration of the first polymer in the first spinning solution is 15% -40%, and the concentration of the first polymer in the second spinning solution is 15% -40%. The mass concentration of the second polymer is 15% -40%, and the organic solvent includes dimethyl sulfoxide, chloroform, N, N-dimethylformamide, and N, N-dimethylacetamide. At least one.
7. The method for preparing formaldehyde purification fiber according to claim 1, wherein the spinning temperature of the electrostatic spinning is 20 ° C-35 ° C, the humidity is 20% -80%, and the injection speed is 0.4ml / h -1.8ml / h; the vacuum drying temperature of 40 ℃ -80 ℃, time 6h-24h; the UV irradiation is irradiation 2h-12h at 10μW / cm ² -100μW / cm ² ultraviolet light intensity.
8. A formaldehyde purification fiber, which is prepared by the method for preparing a formaldehyde purification fiber according to any one of claims 1-7.
9. The formaldehyde purification fiber according to claim 8, wherein the formaldehyde purification fiber has a diameter of 700nm-1300nm.
10. The formaldehyde purification fiber according to claim 8, wherein the conversion rate of formaldehyde purification fiber to formaldehyde is higher than 93%.

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