CN111266136A - Aramid nanofiber composite material, preparation method thereof and application thereof in photocatalytic degradation of rhodamine b - Google Patents
Aramid nanofiber composite material, preparation method thereof and application thereof in photocatalytic degradation of rhodamine b Download PDFInfo
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- CN111266136A CN111266136A CN202010170478.4A CN202010170478A CN111266136A CN 111266136 A CN111266136 A CN 111266136A CN 202010170478 A CN202010170478 A CN 202010170478A CN 111266136 A CN111266136 A CN 111266136A
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- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 61
- 239000002121 nanofiber Substances 0.000 title claims abstract description 58
- 239000004760 aramid Substances 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 229940043267 rhodamine b Drugs 0.000 title claims abstract description 20
- 238000013033 photocatalytic degradation reaction Methods 0.000 title claims abstract description 9
- 230000003197 catalytic effect Effects 0.000 claims abstract description 13
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 58
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 36
- 239000002904 solvent Substances 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 150000003839 salts Chemical class 0.000 claims description 15
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical group [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000000376 reactant Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 5
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 5
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 5
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 5
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910021645 metal ion Inorganic materials 0.000 claims description 3
- 238000000870 ultraviolet spectroscopy Methods 0.000 claims description 3
- 229910052724 xenon Inorganic materials 0.000 claims description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 3
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims description 2
- 229910001626 barium chloride Inorganic materials 0.000 claims description 2
- HWSZZLVAJGOAAY-UHFFFAOYSA-L lead(II) chloride Chemical compound Cl[Pb]Cl HWSZZLVAJGOAAY-UHFFFAOYSA-L 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 30
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 abstract description 7
- 239000002923 metal particle Substances 0.000 abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052709 silver Inorganic materials 0.000 abstract description 3
- 239000004332 silver Substances 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract description 2
- 239000002105 nanoparticle Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 238000005215 recombination Methods 0.000 abstract 1
- 230000006798 recombination Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 22
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 230000005595 deprotonation Effects 0.000 description 6
- 238000010537 deprotonation reaction Methods 0.000 description 6
- 230000001699 photocatalysis Effects 0.000 description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- PIJPYDMVFNTHIP-UHFFFAOYSA-L lead sulfate Chemical compound [PbH4+2].[O-]S([O-])(=O)=O PIJPYDMVFNTHIP-UHFFFAOYSA-L 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002114 nanocomposite Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 229920003366 poly(p-phenylene terephthalamide) Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003378 silver Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- 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
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/02—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the alkali- or alkaline earth metals or beryllium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/14—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of germanium, tin or lead
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/50—Silver
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/72—Copper
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Abstract
The invention relates to an aramid nanofiber composite material, a preparation method thereof and application thereof in photocatalytic degradation of rhodamine b. The preparation method of the aramid nano-fiber composite material is simple to operate, less in material consumption, uniform in obtained appearance, and uniform in dispersion of nano-metal particles in the porous structure of the aramid fiber. Due to the fact that the aramid nano-fiber and Ag composite material has a conjugated system, electrons excited by silver nano-particle light can be effectively transferred to oxygen through the aramid nano-fiber, recombination of electron hole pairs is prevented, and the aramid nano-fiber and Ag composite material have a high volume ratio of surface areas, so that the number of active sites for adsorbing rhodamine b dye in a solution is increased. Therefore, the silver nanoparticles immobilized on the aramid nanofibers have good catalytic activity, the catalytic (under sunlight) efficiency of the silver nanoparticles to rhodamine b can reach 98.5%, and the catalytic efficiency of the material after being repeatedly used for five times is over 90%.
Description
Technical Field
The invention relates to the field of preparation and application of composite materials, in particular to an aramid nanofiber composite material, a preparation method thereof and application thereof in photocatalytic degradation of rhodamine b.
Background
The aramid nano-fiber has a special molecular structure and inherits and surpasses the good performance of a macroscopic PPTA fiber. The composite material is easy to disperse, is convenient to be compounded with other materials, has good heat insulation and oxidation resistance, and has wide application prospect in the fields of supercapacitors, diaphragm materials, high temperature resistant filtering materials and the like.
Aramid nanofibers are chosen because of their large surface area and surface energy. Because adjacent atoms are lacked around the surface atoms, the unsaturated degree of the modified epoxy resin is higher, the modified epoxy resin can form stable bonding force with other atoms, can be bonded with various atoms, and has high chemical activity and large modification space. The special molecular structure, the larger porosity and the metal ions of the material are synthesized into the nano composite material, and the nano composite material can be used for photocatalytic degradation of rhodamine b. Many methods for compounding aramid nano-fiber with other materials exist, but most of the methods are complex in operation, harsh in experimental conditions and extremely high in cost, and are difficult to be used for large-scale production.
Silver nanoparticles can make electron transition as a main matrix of photocatalytic reaction through illumination, and the catalytic activity of inorganic silver salts and inorganic/silver composite materials is mostly researched, while the research on organic/silver nanoparticles is reported to be limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an aramid nanofiber composite material, a preparation method thereof and application thereof in photocatalytic degradation of rhodamine b.
The technical scheme for solving the technical problems is as follows: a preparation method of an aramid nanofiber composite material comprises the following steps:
1) adding para-aramid into DMSO (dimethylsulfoxide) dissolved with KOH (potassium hydroxide), and deprotonating to prepare an aramid nanofiber ANFs solution;
2) adding soluble metal salt into DMSO solvent at 20-25 deg.C, and performing ultrasonic treatment for 30min to completely dissolve the soluble metal salt to obtain DMSO solution of the soluble metal salt;
3) dripping the ANFs solution obtained in the step 1) into the DMSO solution of the soluble metal salt obtained in the step 2) by using an injector at the temperature of 20-25 ℃, standing at the room temperature of 10-25 ℃, reacting for 5 hours, putting the reactant into a DMF solvent, stirring at the temperature of 60 ℃ and at the speed of 400r/min for 3-6 hours;
4) and (3) taking out the product stirred in the step 3), repeatedly washing the product with distilled water, and drying the product in a vacuum drying oven at 60 ℃ to obtain the product.
Wherein, the mass ratio of KOH to para-aramid in the step 1) is (1-1.5) to 1, and the concentration of ANFs solution is 2-2.5 mg/mL; in the step 2), the soluble metal salt is any one of silver nitrate, calcium sulfate, barium chloride, copper sulfate, nickel sulfate or lead chloride, and the concentration of metal ions in the DMSO solution of the obtained soluble metal salt is 2-10 mg/mL; in the step 3), the volume ratio of the ANFs solution to the DMSO solution of the soluble metal salt is 1 (2-5).
The second purpose of the invention is to provide the aramid nano-fiber composite material prepared by the preparation method.
The third purpose of the invention is to provide the application of the aramid nano-fiber composite material in photocatalytic degradation of rhodamine b, in particular to the application of the aramid nano-fiber and Ag composite material in photocatalytic degradation of rhodamine b.
Specifically, the aramid nano-fiber and Ag composite material is added into a solution containing rhodamine b, catalytic degradation is carried out for 6 hours under sunlight, a xenon lamp or visible light, and the degradation rate is measured by an ultraviolet visible spectrophotometer under the wavelength of 553.6 nm.
The invention has the beneficial effects that:
1. the preparation method of the aramid nano-fiber composite material is simple to operate, less in material consumption, uniform in obtained appearance, and uniform in dispersion of nano-metal particles in the porous structure of the aramid fiber.
2. Due to the existence of a conjugated system, the aramid nano-fiber and Ag composite material can effectively transfer electrons excited by silver nano-particle light to oxygen through the aramid nano-fiber, and prevent electron hole pairs from being recombined. On the other hand, the aramid nanofiber and Ag composite material have a high surface area volume ratio, which can result in the increase of the number of active sites for adsorbing rhodamine b dye in the solution. Therefore, the silver nanoparticles immobilized on the aramid nanofibers have good catalytic activity, the catalytic (under sunlight) efficiency of the silver nanoparticles to rhodamine b can reach 98.5%, and the catalytic efficiency of the material after being repeatedly used for five times is over 90%.
Drawings
FIG. 1 is a scanning electron microscope of the composite material of aramid nanofibers and Ag obtained in example 1;
FIG. 2 is a scanning electron microscope of the aramid nanofiber and Cu composite obtained in example 2;
fig. 3 is a scanning electron microscope of the composite material of aramid nanofibers and Ba obtained in example 3;
FIG. 4 is a scanning electron microscope of the composite of the aramid nanofibers and Ca obtained in example 4;
FIG. 5 is a scanning electron microscope of the aramid nanofiber and Ni composite obtained in example 5;
FIG. 6 is a scanning electron microscope of the composite material of aramid nanofibers and Pb obtained in example 6;
FIG. 7 is a scanning electron microscope of the inner cross section of the aramid nanofiber and Ag composite material;
FIG. 8 is a graph of photocatalysis under different light sources;
FIG. 9 is a graph of catalytic kinetics for different light intensities in sunlight;
FIG. 10 shows the UV absorption intensity of rhodamine b at different photocatalytic durations.
Detailed Description
The present invention is described below with reference to examples, which are provided for illustration only and are not intended to limit the scope of the present invention.
Example 1
A preparation method of an aramid nanofiber composite material comprises the following steps:
(1) adding 0.6g of para-aramid into 50mL of DMSO solvent dissolved with 0.9g of potassium hydroxide, and preparing nanofiber ANFs solution through deprotonation;
(2) adding 0.5g of silver nitrate into 50mL of DMSO solvent at the temperature of 20-25 ℃, and carrying out ultrasonic treatment for 15-30min to completely dissolve the silver nitrate;
(3) dripping the ANFs solution into 50mL of DMSO solvent dissolved with 0.5g of silver nitrate, fully reacting for 5h, placing the reactant in DMF solvent, and stirring for 3h at the temperature of 60 ℃ and at the speed of 400 r/min;
(4) and taking out the materials, repeatedly washing the materials by using distilled water, and drying the materials to obtain the composite material.
Example 2
A preparation method of an aramid nanofiber composite material comprises the following steps:
(1) adding 0.6g of para-aramid into 50mL of DMSO solvent dissolved with 0.9g of potassium hydroxide, and preparing nanofiber ANFs solution through deprotonation;
(2) adding 0.5g of copper sulfate into 50mL of DMSO solvent at the temperature of 20-25 ℃, and carrying out ultrasonic treatment for 15-30min to completely dissolve the copper sulfate;
(3) dripping the ANFs solution into 50mL of DMSO solvent dissolved with 0.5g of copper sulfate, fully reacting for 5h, placing the reactant in DMF solvent, and stirring for 4h at the temperature of 60 ℃ and at the speed of 400 r/min;
(4) and taking out the materials, repeatedly washing the materials by using distilled water, and drying the materials to obtain the composite material.
Example 3
A preparation method of an aramid nanofiber composite material comprises the following steps:
(1) adding 0.6g of para-aramid into 50mL of DMSO solvent dissolved with 0.9g of potassium hydroxide, and preparing nanofiber ANFs solution through deprotonation;
(2) adding 0.5g of barium sulfate into 50mL of DMSO solvent at the temperature of 20-25 ℃, and carrying out ultrasonic treatment for 15-30min to completely dissolve the barium sulfate;
(3) dripping the ANFs solution into 50mL DMSO solvent containing 0.5g barium sulfate, fully reacting for 5h, placing the reactant in DMF solvent, stirring for 5h at 60 ℃ under the condition of 400 r/min;
(4) and taking out the materials, repeatedly washing the materials by using distilled water, and drying the materials to obtain the composite material.
Example 4
A preparation method of an aramid nanofiber composite material comprises the following steps:
(1) adding 0.6g of para-aramid into 50mL of DMSO solvent dissolved with 0.9g of potassium hydroxide, and preparing nanofiber ANFs solution through deprotonation;
(2) adding 0.5g of calcium chloride into 50mL of DMSO solvent at the temperature of 20-25 ℃, and carrying out ultrasonic treatment for 15-30min to completely dissolve the calcium chloride;
(3) dripping the ANFs solution into 50mL of DMSO solvent containing 0.5g of calcium chloride, fully reacting for 5h, placing the reactant in DMF solvent, and stirring for 6h at the temperature of 60 ℃ and at the speed of 400 r/min;
(4) and taking out the materials, repeatedly washing the materials by using distilled water, and drying the materials to obtain the composite material.
Example 5
A preparation method of an aramid nanofiber composite material comprises the following steps:
(1) adding 0.6g of para-aramid into 50mL of DMSO solvent dissolved with 0.9g of potassium hydroxide, and preparing nanofiber ANFs solution through deprotonation;
(2) adding 0.5g of nickel sulfate into 50mL of DMSO solvent at the temperature of 20-25 ℃, and carrying out ultrasonic treatment for 15-30min to completely dissolve the nickel sulfate;
(3) dripping the ANFs solution into 50mL of DMSO solvent containing 0.5g of nickel sulfate, fully reacting for 5h, placing the reactant in DMF solvent, and stirring for 3h at the temperature of 60 ℃ and at the speed of 400 r/min;
(4) and taking out the materials, repeatedly washing the materials by using distilled water, and drying the materials to obtain the composite material.
Example 6
A preparation method of an aramid nanofiber composite material comprises the following steps:
(1) adding 0.6g of para-aramid into 50mL of DMSO solvent dissolved with 0.9g of potassium hydroxide, and preparing nanofiber ANFs solution through deprotonation;
(2) adding 0.5g of lead sulfate into 50mL of DMSO solvent at the temperature of 20-25 ℃, and carrying out ultrasonic treatment for 15-30min to completely dissolve the lead sulfate;
(3) dripping the ANFs solution into 50mL of DMSO solvent containing 0.5g of lead sulfate, fully reacting for 5h, placing the reactant in DMF solvent, and stirring for 3h at the temperature of 60 ℃ and at the speed of 400 r/min;
(4) and taking out the materials, repeatedly washing the materials by using distilled water, and drying the materials to obtain the composite material.
Fig. 1 to fig. 6 are scanning electron microscopes of the aramid nanofibers and the metal composite material obtained in examples 1 to 6, respectively, and it can be seen that the nano metal particles are loaded in the reticular aramid nanofibers, and the nano metal particles are uniformly distributed in the porous structure of the aramid nanofibers and have uniform size.
Applications of
25mg of the aramid nanofiber and Ag composite material obtained in the embodiment 1 is added into 100mL of 20mg/L Rh B aqueous solution, catalytic degradation is carried out for 6h under the conditions of no light, sunlight, xenon lamps and visible light respectively, and the degradation rate is measured by an ultraviolet-visible spectrophotometer at the wavelength of 553.6 nm.
FIG. 7 is a scanning electron microscope of the internal cross section of the composite material obtained in example 1, in which it can be seen that the material is in a net-like porous state and has silver nanoparticles distributed therein; FIG. 8 is a graph of the photocatalysis of different light sources, which shows that the catalysis effect is best under the sunlight condition; FIG. 9 shows the catalytic kinetics of different light intensities in sunlight, the higher the light intensity is, the better the catalytic effect is; FIG. 10 shows the ultraviolet absorption intensity of rhodamine b under different photocatalytic durations, wherein the absorbance of the rhodamine b under 553.6nm wavelength is gradually reduced from 0h to 5h until the absorbance of the rhodamine b under 553.6nm wavelength approaches 0 when the rhodamine b is degraded under photocatalysis for 5 h.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The preparation method of the aramid nanofiber composite material is characterized by comprising the following steps of:
1) adding para-aramid into DMSO (dimethylsulfoxide) dissolved with KOH (potassium hydroxide), and deprotonating to prepare an aramid nanofiber ANFs solution;
2) adding soluble metal salt into DMSO solvent at 20-25 deg.C, and performing ultrasonic treatment for 30min to completely dissolve the soluble metal salt to obtain DMSO solution of the soluble metal salt;
3) dripping the ANFs solution obtained in the step 1) into the DMSO solution of the soluble metal salt obtained in the step 2) by using an injector at the temperature of 20-25 ℃, standing at room temperature, reacting for 5 hours, putting the reactant into a DMF solvent, and stirring at the temperature of 60 ℃ and at the speed of 400r/min for 3-6 hours;
4) and (3) taking out the product stirred in the step 3), repeatedly washing the product with distilled water, and drying the product in a vacuum drying oven at 60 ℃ to obtain the product.
2. The preparation method of the aramid nanofiber composite material as claimed in claim 1, wherein in the step 1), the mass ratio of KOH to the para-aramid is (1-1.5): 1; the concentration of the obtained ANFs solution is 2-2.5 mg/mL.
3. The preparation method of the aramid nanofiber composite material as claimed in claim 1, wherein in the step 2), the soluble metal salt is silver nitrate.
4. The method for preparing the aramid nanofiber composite material as claimed in claim 1, wherein in the step 2), the soluble metal salt is any one of calcium sulfate, barium chloride, copper sulfate, nickel sulfate or lead chloride.
5. The preparation method of the aramid nanofiber composite material as claimed in claim 4, wherein in the step 2), the concentration of the metal ions in the obtained DMSO solution of the soluble metal salt is 2-10 mg/mL.
6. The preparation method of the aramid nanofiber composite material as claimed in claim 1, wherein in the step 3), the volume ratio of the ANFs solution to the DMSO solution of the soluble metal salt is 1 (2-5).
7. An aramid nanofiber composite material prepared by the preparation method of claim 3.
8. An aramid nanofiber composite material prepared by the preparation method of claim 4.
9. An application of the aramid nanofiber composite material as claimed in claim 7 in photocatalytic degradation of rhodamine b.
10. Use according to claim 9, characterized in that the method is as follows:
the aramid fiber nanofiber composite material is added into a solution containing rhodamine b, catalytic degradation is carried out for 6 hours under sunlight, a xenon lamp or visible light, and the degradation rate is measured by an ultraviolet visible spectrophotometer under the wavelength of 553.6 nm.
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