CN109355803B - Preparation method of coated polysulfide electrostatic spinning nanofiber membrane and application of coated polysulfide electrostatic spinning nanofiber membrane in metal ion adsorption under oxidative stimulus response - Google Patents
Preparation method of coated polysulfide electrostatic spinning nanofiber membrane and application of coated polysulfide electrostatic spinning nanofiber membrane in metal ion adsorption under oxidative stimulus response Download PDFInfo
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Abstract
The invention discloses a preparation method of a coated polysulfide electrostatic spinning nanofiber membrane and application of the coated polysulfide electrostatic spinning nanofiber membrane in metal ion adsorption under oxidative stimulus response. Such a film can significantly increase the amount of adsorption of metal ions and has selective adsorption characteristics for a particular metal.
Description
Technical Field
The invention relates to the field of materials, in particular to a preparation method of a coated polysulfide electrostatic spinning nanofiber membrane and application of the coated polysulfide electrostatic spinning nanofiber membrane in metal ion adsorption under oxidative stimulus response.
Background
The elemental sulfur is a substance with abundant reserves on the earth, the yield per year is huge, and the elemental sulfur is mainly used for producing products such as sulfuric acid and various sulfides, and rubber vulcanizing agents in the synthetic rubber industry (such as producing tires). However, the traditional sulfur-containing substance production industry can generate a large amount of sulfur waste, the utilization rate of sulfur is not high, and the waste sulfur is generally discharged to the nature, which causes serious problems of resource waste and environmental pollution. How to utilize a large amount of sulfur and change waste into valuable is a difficult point. The invention patent CN201510207935.1 of the inventor's earlier application discloses a sulfur/terpene copolymer and a synthetic method thereof, which takes monoterpene hydrocarbon (R) - (+) -limonene as a comonomer, and adopts a method of ' reverse vulcanization ' to directly mix terpene and elemental sulfur for bulk melting free radical copolymerization reaction, so as to obtain sulfur-rich oligomer with good solubility. Further research by the inventor shows that the polysulfide (Psf) with good solubility has oxidation stimulation responsiveness, and under the action of different oxidizing agents and different oxidation degrees, sulfur elements in polysulfide molecules can be oxidized into different structures; and oxidized polysulfides proved to contain sulfone and sulfoxide groups, and are therefore presumed to have the ability to coordinate metal ions.
The special property before and after polysulfide oxidation can be used for adsorbing different metal ions, and the metal ions have different coordination abilities and can form coordination compounds with different structures with different ligands. Trivalent chromium ions Cr (III), cobalt ions Co (II) and nickel ions Ni (II) are three metal ions which are common in industrial wastewater, once the metals enter an environmental water body, the metals cannot be degraded by beneficial microorganisms, are difficult to be completely eliminated through the self-cleaning capacity of the water body, and can cause acute food poisoning or cumulative poisoning of organism tissues through the enrichment function of a food chain, so that the metal ions have the characteristics of difficult metabolism and easy transmission.
The method mainly comprises a chemical precipitation method, a coagulation-flocculation method, an oxidation-reduction method, an ion exchange method, a solvent extraction method, a biological treatment method, an adsorption method and the like, wherein the adsorption method has the advantages of simple and effective operation, easy reuse, lower cost and the like.
The adsorption is a mass transfer process, the concentration difference formed by a physical/chemical method of metal ions is diffused to an adsorbent, and a material with a large specific surface area has a larger adsorption action surface, and adsorption groups have more chances to contact with the metal ions, so that the adsorption is stronger. At present, a great deal of reports are made on the research of the electrostatic spinning nano material for adsorption, and the electrostatic spinning nano fiber film has a large specific surface area, can stably exist in an aqueous solution, is convenient to recover and does not have secondary pollution. Besides, the material with specific adsorption performance is introduced into the nano-fiber, so that specific metal ions can be selectively and anti-interference adsorbed and recovered. The functional molecules in the nano-fiber can be introduced to have different morphological structures, and the structure of the functional molecule coating and the fiber can be prepared through the selection of spinning solvent, the optimization of spinning process and the addition proportion of the functional molecules. The fiber with the coating structure can prevent the adsorbent from diffusing into water to form secondary pollution under the external stimulation effect, and meanwhile, the adsorbent after saturated adsorption can be taken out of water conveniently.
Therefore, the polysulfide is coated in the nanofiber and is subjected to electrostatic spinning, and the polysulfide acts on aqueous solutions containing different metal ions under the stimulation conditions of different oxidants and different oxidation degrees, so that the nanofiber has specific adsorption performance on the different metal ions.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method of a coated polysulfide electrostatic spinning nanofiber membrane.
The invention also aims to provide application of the coated polysulfide electrostatic spinning nanofiber membrane for adsorbing metal ions under the response of oxidative stimulus.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a coated polysulfide electrostatic spinning nanofiber membrane comprises the steps of dissolving polysulfide in Dichloromethane (DCM) to obtain a polysulfide solution, then dripping the polysulfide solution into a polyvinylidene fluoride (PVDF) solution to form a homogeneous mixed spinning solution, and preparing the coated polysulfide electrostatic spinning nanofiber membrane by an electrostatic spinning method.
The PVDF solution is a solution prepared by dissolving polyvinylidene fluoride in dimethylacetamide (DMAc), the concentration of the PVDF solution is 12-18 wt.%, and the dosage of the polysulfide is 10-30% of the mass of the PVDF.
The electrostatic spinning has the operating parameters of voltage of 12-20 kV, speed of 1-4 m L/h and receiving plate distance of 10-15 cm.
The application of the coated polysulfide electrostatic spinning nanofiber membrane is that the coated polysulfide electrostatic spinning nanofiber membrane is used for adsorbing metal ions under the response of oxidation stimulation, the coated polysulfide electrostatic spinning nanofiber membrane is soaked into an aqueous solution containing an oxidant for oxidation, the oxidized nanofiber membrane is taken out, cleaned and dried after a certain time, and then the oxidized nanofiber membrane is soaked into an aqueous solution containing metal ions for adsorbing the metal ions.
The oxidant is hydrogen peroxide or sodium hypochlorite aqueous solution, and the concentration of the oxidant is 0.05-0.25 mmol/L (mM for short).
The oxidation time is 2-24 h, the cleaning is carried out by soaking and washing with distilled water and absolute ethyl alcohol for more than three times, and the adsorption time is 0.5-24 h.
The metal ion is one of Cr (III), Co (II) and Ni (II); the initial concentration is 1-100 ppm.
Compared with the prior art, the invention has the following advantages and effects:
(1) according to the coated polysulfide electrostatic spinning nanofiber membrane, oxidized polysulfide molecules with different coordination groups are formed by adjusting the oxidation degree and different types of oxidants, the types and initial concentrations of adsorbed metals are reasonably designed, and compared with the saturated adsorption amounts of a blank control membrane before and after oxidation, the membrane can obviously improve the adsorption amount of metal ions and has selective adsorption characteristics on specific metals.
(2) The nanofiber membrane prepared by the method has definite structure and oxidized polysulfide, controllable properties and functionality and higher yield; the preparation process is simple, the preparation can be carried out under the conditions of conventional operation and room temperature, the safety is high, the material post-treatment method is simple and convenient, and the test conditions and the method are simple and easy to obtain.
(3) The invention is used in the water treatment process, and the nanofiber membrane has the advantages of convenient placement, convenient recycling and no secondary pollution.
Drawings
Fig. 1 is an SEM image of the coated polysulfide electrospun nanofiber membrane of the present invention.
FIG. 2 is a graph of the saturated adsorption capacity of the coated polysulfide electrospun nanofiber membrane of the invention before and after oxidation and for a blank control sample for three metal ions.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
(1) 0.64g of PVDF is added into a 10m L serum bottle, a 5m L DMAc solvent is added, the mixture is fully stirred until the PVDF is completely dissolved to obtain a PVDF solution with the concentration of 12 wt.%, a Psf (polysulfide) 64mg is added into the other serum bottle, 2m L DCM is added to enable the Psf to be completely dissolved to obtain a brownish red clear and transparent solution, the Psf solution is slowly dripped into the PVDF solution under rapid stirring, the Psf is precipitated in the PVDF solution initially, the mixture is fully stirred overnight until the Psf is completely dissolved, and the mixed solution is clear and transparent to obtain a mixed spinning solution.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 10cm, setting the spinning voltage to be 12kV and the feeding speed to be 1m L/h for spinning, removing the aluminum foil after the spinning is finished, and drying the aluminum foil in a blast drying oven to remove the solvent which is not completely volatilized, thereby finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into 5 × 5cm2Each small film is immersed into 20m L aqueous solution of hydrogen peroxide with the concentration of 0.05mM, is taken out after standing for 2h, is washed with water and ethanol for three times, and is dried, the mass of the dried film is weighed, each small film is immersed into 20m L aqueous solution containing three metal ions of Cr (III), Co (II) and Ni (II) respectively, the initial concentrations of the three metal ions are all 1ppm, and is taken out after standing for 0.5h, the concentrations of the metal ions after adsorption are respectively tested, and the saturated adsorption quantity of the polysulfide is calculated.
The metal ion concentration test method comprises the following steps: cr (III) and Ni (II) adopt atomic absorption spectrometry (AES), and Co (II) adopts inductively coupled plasma mass spectrometry (ICP-MS).
Example 2
(1) 0.82g of PVDF is added into a 10m L serum bottle, a 5m L DMAc solvent is added, the mixture is fully stirred until the PVDF is fully dissolved to obtain a PVDF solution with the concentration of 15 wt.%, psf.164mg is added into the other serum bottle, 2m L DCM is added to fully dissolve the psf to obtain a brownish red clear transparent solution, the psf solution is slowly dripped into the PVDF solution under rapid stirring, the psf is precipitated in the PVDF solution initially, the mixture is fully stirred overnight until the psf is fully dissolved, and the mixture is clear and transparent to obtain a mixed spinning solution.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 12cm, setting the spinning voltage to be 15kV and the feeding speed to be 2m L/h for spinning, removing the aluminum foil after the spinning is finished, placing the aluminum foil in a blast drying oven for drying to remove the solvent which is not completely volatilized, and finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into 5 × 5cm2Each small film is immersed in 20m of 0.15mM hydrogen peroxide solution with L concentration, and is taken out after standing for 8h, and is added with waterAnd washing with ethanol for three times, drying, weighing the mass of the dried film, immersing each small film into 20m L aqueous solution respectively containing three metal ions of Cr (III), Co (II) and Ni (II), wherein the initial concentrations of the three metal ions are 10ppm, standing for 4h, taking out, respectively testing the concentrations of the metal ions after adsorption, and calculating the saturated adsorption quantity of the polysulfide.
Example 3
(1) Adding 1.03g of PVDF into a 10m L serum bottle, adding a 5m L DMAc solvent, fully stirring until the PVDF is completely dissolved to obtain a PVDF solution with the concentration of 18 wt.%, adding psf.309mg into the other serum bottle, adding 2m L DCM to completely dissolve the psf to obtain a brownish red clear and transparent solution, slowly dropwise adding the psf solution into the PVDF solution under rapid stirring, initially precipitating the psf in the PVDF solution, fully stirring overnight until the psf is completely dissolved, and obtaining a mixed spinning solution after the mixed solution is clear and transparent.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 15cm, setting the spinning voltage to be 18kV and the feeding speed to be 3m L/h for spinning, removing the aluminum foil after the spinning is finished, placing the aluminum foil in a blast drying oven for drying to remove the solvent which is not completely volatilized, and finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into 5 × 5cm2Each small film is immersed into 20m L aqueous solution of hydrogen peroxide with the concentration of 0.25mM, is taken out after standing for 12h, is washed with water and ethanol for three times, and is dried, the mass of the dried film is weighed, each small film is immersed into 20m L aqueous solution containing three metal ions of Cr (III), Co (II) and Ni (II) respectively, the initial concentrations of the three metal ions are all 100ppm, and is taken out after standing for 8h, the concentrations of the metal ions after adsorption are respectively tested, and the saturated adsorption quantity of the polysulfide is calculated.
Example 4
(1) 0.82g of PVDF is added into a 10m L serum bottle, a 5m L DMAc solvent is added, the mixture is fully stirred until the PVDF is fully dissolved to obtain a PVDF solution with the concentration of 15 wt.%, a psf.82mg is added into the other serum bottle, a 2m L DCM is added to fully dissolve the psf to obtain a brownish red clear and transparent solution, the psf solution is slowly dripped into the PVDF solution under rapid stirring, the psf is precipitated in the PVDF solution initially, the mixture is fully stirred overnight until the psf is fully dissolved, and the mixed solution is clear and transparent to obtain a mixed spinning solution.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 10cm, setting the spinning voltage to be 20kV and the feeding speed to be 4m L/h for spinning, removing the aluminum foil after the spinning is finished, and drying the aluminum foil in a blast drying oven to remove the solvent which is not completely volatilized, thereby finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into 5 × 5cm2Each small film is immersed into sodium hypochlorite aqueous solution with the concentration of 20m L being 0.05mM, is taken out after standing for 16h, is washed with water and ethanol for three times, and is dried, the weight of the dried film is weighed, each small film is immersed into aqueous solution with the concentration of 20m L containing three metal ions of Cr (III), Co (II) and Ni (II), the initial concentration of the three metal ions is 1ppm, and is taken out after standing for 12h, the concentration of each metal ion after adsorption is respectively tested, and the saturated adsorption quantity of polysulfide is calculated.
Example 5
(1) 0.82g of PVDF is added into a 10m L serum bottle, a 5m L DMAc solvent is added, the mixture is fully stirred until the PVDF is fully dissolved to obtain a PVDF solution with the concentration of 15 wt.%, psf.164mg is added into the other serum bottle, 2m L DCM is added to fully dissolve the psf to obtain a brownish red clear transparent solution, the psf solution is slowly dripped into the PVDF solution under rapid stirring, the psf is precipitated in the PVDF solution initially, the mixture is fully stirred overnight until the psf is fully dissolved, and the mixture is clear and transparent to obtain a mixed spinning solution.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 12cm, setting the spinning voltage to be 20kV and the feeding speed to be 3m L/h for spinning, removing the aluminum foil after the spinning is finished, placing the aluminum foil in a blast drying oven for drying to remove the solvent which is not completely volatilized, and finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into 5 × 5cm2Each small film is immersed into sodium hypochlorite aqueous solution with the concentration of 20m L being 0.15mM, is taken out after standing for 18h, is washed with water and ethanol for three times, and is dried, the weight of the dried film is weighed, each small film is immersed into aqueous solution with the concentration of 20m L containing Cr (III), Co (II) and Ni (II) respectively, the initial concentration of the three metal ions is 10ppm, and is taken out after standing for 16h, the concentration of each metal ion after adsorption is respectively tested, and the saturated adsorption quantity of polysulfide is calculated.
Example 6
(1) 0.82g of PVDF is added into a 10m L serum bottle, a 5m L DMAc solvent is added, the mixture is fully stirred until the PVDF is fully dissolved to obtain a PVDF solution with the concentration of 15 wt.%, a psf.246mg is added into the other serum bottle, 2m L DCM is added to enable the psf to be fully dissolved to obtain a brownish red clear and transparent solution, the psf solution is slowly dripped into the PVDF solution under rapid stirring, the psf is precipitated in the PVDF solution initially, the mixture is fully stirred overnight until the psf is fully dissolved, and the mixed solution is clear and transparent to obtain a mixed spinning solution.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 15cm, setting the spinning voltage to be 15kV and the feeding speed to be 2m L/h for spinning, removing the aluminum foil after the spinning is finished, placing the aluminum foil in a blast drying oven for drying to remove the solvent which is not completely volatilized, and finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into 5 × 5cm2Each small film is immersed into sodium hypochlorite aqueous solution with the concentration of 20m L being 0.25mM, is taken out after standing for 24h, is washed with water and ethanol for three times, and is dried, the mass of the dried film is weighed, each small film is immersed into aqueous solution with the concentration of 20m L containing three metal ions of Cr (III), Co (II) and Ni (II), the initial concentration of the three metal ions is 100ppm, and is taken out after standing for 20h, the concentration of each metal ion after adsorption is respectively tested, and the saturated adsorption quantity of polysulfide is calculated.
Example 7
(1) Adding 1.03g of PVDF into a 10m L serum bottle, adding a 5m L DMAc solvent, fully stirring until the PVDF is completely dissolved to obtain a PVDF solution with the concentration of 18 wt.%, adding psf.103mg into the other serum bottle, adding 2m L DCM to completely dissolve the psf to obtain a brownish red clear transparent solution, slowly dropwise adding the psf solution into the PVDF solution under rapid stirring, initially precipitating the psf in the PVDF solution, fully stirring overnight until the psf is completely dissolved, and obtaining a mixed spinning solution after the mixed solution is clear and transparent.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 15cm, setting the spinning voltage to be 15kV and the feeding speed to be 3m L/h for spinning, removing the aluminum foil after the spinning is finished, and drying the aluminum foil in a blast drying oven to remove the solvent which is not completely volatilized, thereby finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into 5 × 5cm2Each small film is immersed into 20m L aqueous solution of hydrogen peroxide with the concentration of 0.15mM, is taken out after standing for 24h, is washed with water and ethanol for three times, and is dried, the mass of the dried film is weighed, each small film is immersed into 20m L aqueous solution containing three metal ions of Cr (III), Co (II) and Ni (II) respectively, the initial concentrations of the three metal ions are all 100ppm, and is taken out after standing for 24h, the concentrations of the metal ions after adsorption are respectively tested, and the saturated adsorption quantity of the polysulfide is calculated.
Example 8
(1) 0.64g of PVDF is added into a 10m L serum bottle, a 5m L DMAc solvent is added, the mixture is fully stirred until the PVDF is fully dissolved to obtain a PVDF solution with the concentration of 12 wt.%, psf.192mg is added into the other serum bottle, 2m L DCM is added to fully dissolve the psf to obtain a brownish red clear transparent solution, the psf solution is slowly dripped into the PVDF solution under rapid stirring, the psf is precipitated in the PVDF solution initially, the mixture is fully stirred overnight until the psf is fully dissolved, and the mixture is clear and transparent to obtain a mixed spinning solution.
(2) Adding the mixed spinning solution obtained in the step (1) into a 15m L dispensing injector, clamping the dispensing injector to electrostatic spinning machine equipment, collecting a layer of receiving aluminum foil attached to the outside of a roller, adjusting the distance between the roller and a needle to be 15cm, setting the spinning voltage to be 15kV and the feeding speed to be 3m L/h for spinning, removing the aluminum foil after the spinning is finished, and drying the aluminum foil in a blast drying oven to remove the solvent which is not completely volatilized, thereby finally obtaining the coated polysulfide electrostatic spinning nanofiber membrane.
(3) Cutting the nanofiber membrane obtained in the step (2) into square small blocks of 5 × 5cm, immersing each small block of membrane into a sodium hypochlorite aqueous solution with the concentration of 20m L of 0.15mM, standing for 24h, taking out, washing with water and ethanol for three times, drying, weighing the membrane mass of the dried membrane, immersing each small block of membrane into a 20m L aqueous solution containing three metal ions of Cr (III), Co (II) and Ni (II) respectively, wherein the initial concentrations of the three metal ions are 100ppm, standing for 24h, taking out, testing the concentrations of the metal ions after adsorption respectively, and calculating the saturated adsorption quantity of polysulfide.
Test example
As shown in figure 1, the size of the fiber of the coated polysulfide electrostatic spinning nanofiber membrane prepared by the invention is 100-200 nm, and the coated polysulfide electrostatic spinning nanofiber membrane has a great advantage of specific surface area.
As shown in fig. 2, the saturated adsorption amounts of the three metal ions, Cr (iii), Co (ii) and Ni (ii), of the coated polysulfide electrospun nanofiber membrane before polysulfide oxidation (Psf), after polysulfide oxidation (o.psf) and the blank control (PVDF) were compared and analyzed. Researches find that the saturated adsorption capacity of the oxidized coated polysulfide electrostatic spinning nanofiber membrane to metal ions is obviously increased, so that the oxidized coated polysulfide electrostatic spinning nanofiber membrane has obvious adsorption property to the metal ions and has the maximum adsorption capacity to Co (II).
Table 1 summarizes the saturated adsorption amounts of the oxidized coated polysulfide electrospun nanofiber membrane obtained in each example on three metal ions. According to the test result, the coating polysulfide electrostatic spinning nanofiber membrane with different oxidation degrees has certain adsorption capacity on three metal ions and has obvious saturated adsorption capacity on Co (II). It can be seen that the surface-coated polysulfide nanofiber membrane has complete feasibility of being used as an adsorbent under the response of oxidation stimulus.
TABLE 1 saturated adsorption capacity of oxidized coated polysulfide electrospun nanofiber membrane for three metal ions
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A preparation method of a coated polysulfide electrostatic spinning nanofiber membrane is characterized by comprising the following steps: dissolving polysulfide in dichloromethane to obtain a polysulfide solution, then dropping the polysulfide solution into a polyvinylidene fluoride solution to form a homogeneous mixed spinning solution, and preparing the coated polysulfide electrostatic spinning nanofiber membrane by an electrostatic spinning method; the polysulfide has oxidation stimulation responsiveness, and under the action of different oxidants and different oxidation degrees, sulfur elements in polysulfide molecules can be oxidized into different structures; the coated polysulfide electrostatic spinning nanofiber membrane adsorbs metal ions under the response of oxidation stimulus.
2. The method of preparing the coated polysulfide electrospun nanofiber membrane of claim 1, characterized in that: the polyvinylidene fluoride solution is a solution prepared by dissolving polyvinylidene fluoride in dimethylacetamide, and the concentration of the polyvinylidene fluoride solution is 12-18 wt.%.
3. The method of preparing the coated polysulfide electrospun nanofiber membrane of claim 1, characterized in that: the dosage of the polysulfide is 10-30% of the mass of the polyvinylidene fluoride.
4. The method for preparing the coated polysulfide electrospinning nanofiber membrane according to claim 1, wherein the electrospinning parameters are voltage 12-20 kV, speed 1-4 m L/h, and receiving plate distance 10-15 cm.
5. The application of the coating polysulfide electrostatic spinning nanofiber membrane is characterized in that: soaking the coated polysulfide electrospun nanofiber membrane prepared by the method of any one of claims 1 to 4 into an aqueous solution containing an oxidant, oxidizing, taking out, cleaning, drying, and then soaking into an aqueous solution containing metal ions to adsorb the metal ions.
6. The application of the coated polysulfide electrostatic spinning nanofiber membrane as claimed in claim 5, wherein the oxidant is hydrogen peroxide or an aqueous solution of sodium hypochlorite, and the concentration of the oxidant is 0.05-0.25 mmol/L.
7. Use of the coated polysulfide electrospun nanofiber membrane according to claim 5, characterized in that: the oxidation time is 2-24 h, the cleaning is carried out by soaking and washing with distilled water and absolute ethyl alcohol for more than three times, and the adsorption time is 0.5-24 h.
8. Use of the coated polysulfide electrospun nanofiber membrane according to claim 5, characterized in that: the metal ion is one of Cr (III), Co (II) and Ni (II).
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