CN111644161A - Modified fiber ball loaded polyaniline composite material and preparation method and application thereof - Google Patents
Modified fiber ball loaded polyaniline composite material and preparation method and application thereof Download PDFInfo
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/262—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
- C08G73/026—Wholly aromatic polyamines
- C08G73/0266—Polyanilines or derivatives thereof
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- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/61—Polyamines polyimines
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Abstract
The invention discloses a modified fiber ball loaded polyaniline composite material and a preparation method and application thereof, and relates to the field of composite materials. The composite material is in a spherical structure with the diameter of 4-5 cm, and structurally comprises modified fiber balls and polyaniline with a nano-filamentous structure loaded on the modified fiber balls; the invention also discloses a preparation method of the composite material, which comprises three steps of modification of fiber balls, preparation of nano-filamentous polyaniline and preparation of PANI/m-FB composite material; the method takes the modified fiber ball as a load material, and attaches the polyaniline to the fiber ball by a seed polymerization method, so that the method has the advantages of mature process, low cost and good repeatability, and can realize batch production. The prepared composite material can be used for removing Cr (VI) in sewage, the removal capacity can reach 291.13mg/g, secondary pollution is not easy to cause, and after repeated use for many times, the removal rate can still reach 90 percent, so that the composite material is a good adsorbent and can be applied to industrial sewage treatment.
Description
Technical Field
The invention relates to a composite material, in particular to a modified fiber ball loaded polyaniline composite material, a preparation method of the composite material and application of the composite material in removing heavy metal ions Cr (VI) in a water body.
Background
Polyaniline is a conductive high molecular polymer, and is widely applied to the fields of sensors, battery materials, electromagnetic shielding materials, wave-absorbing materials and the like due to unique physical and chemical properties. In addition, polyaniline has a unique molecular structure, not only has a good complexing effect on heavy metal ions, but also has rich redox characteristics, so that polyaniline can be used as a good adsorbing material for sewage treatment.
At present, polyaniline with a nano-micro structure is mostly researched, and in 2004, Ruotolo and the like prepare a polyaniline nano film with high conductivity by an electrodeposition method; in 2011, Guo et al prepared polyaniline nanofibers with uniform morphology by a chemical oxidative polymerization method; in 2018, Wu et al prepared a polyaniline hollow sphere structure under alkaline conditions. Research shows that the polyaniline film has small specific surface area and limited capability of removing Cr (VI) in aqueous solution. Compared with the nano film, polyaniline nano fiber, nano hollow sphere and the like have larger specific surface area, but the polyaniline nano fiber and nano hollow sphere have small volume, so that secondary pollution is easily caused in practical application, and the industrial application of the polyaniline nano fiber and nano hollow sphere is also limited.
In recent years, researchers hope to achieve the purpose of reducing secondary pollution by compounding polyaniline with other materials. An article published by Harijan et al entitled "Magnetite/graphene/polyaniline composite material removal of graphene/polyaniline," J.appl.Polym.Sci., 2016,133 (synthesis of Magnetite/graphene/polyaniline composite material for removing Cr (VI), "journal of applied Polymer science," volume 133 of 2016) reports that polyaniline can be recycled by compounding polyaniline with graphene and Magnetite, and the maximum adsorption capacity can reach 153.3 mg/g. However, the recycling process of the material is complicated, a magnet is needed, and then the material is separated, so that the requirements of low cost and simple operation are not met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a modified fiber ball loaded polyaniline composite material;
another technical problem to be solved by the invention is to provide a preparation method of the modified fiber ball loaded polyaniline composite material;
the invention aims to solve the other technical problem of providing the application of the modified fiber ball loaded polyaniline composite material;
in order to solve the technical problem, the technical scheme is that the polyaniline-loaded composite material with the modified fiber spheres is in a spherical structure with the diameter of 4-5 cm, the spherical structure comprises the modified fiber spheres positioned in the center and the polyaniline with the nano-filamentous structure loaded on the modified fiber spheres, the modified fiber spheres are prepared by modifying the fiber spheres, the mass ratio of the modified fiber spheres to the polyaniline is (3-5): (1-5), the diameter of the polyaniline with the nano-filamentous structure is 190 +/-10 nm, and the length of the polyaniline with the nano-filamentous structure is 1-1.5 mu m.
As a further improvement of the modified fiber ball loaded polyaniline composite material:
preferably, the main material of the fiber ball is polyester fiber, the diameter of the fiber ball is 0.8-1 mm, and the density of the fiber ball is 1.5g/cm3Specific surface area of 3000m2/m3。
In order to solve another technical problem, the technical scheme adopted is that the preparation method of the modified fiber ball loaded polyaniline composite material is characterized by comprising the following steps:
s1, immersing the fiber balls in deionized water, drying in an oven at 50-60 ℃ to constant weight after ultrasonic cleaning, weighing 8-10 g of dried fiber balls, and putting the dried fiber balls into 1000mL of H with the concentration of 5-20 g/L2O2Stirring the solution at room temperature for 12-24 h at a stirring speed of 400-500 r/min, taking out the fiber balls, drying the fiber balls in an oven at a temperature of 50-60 ℃,preparing modified fiber balls;
s2, preparing two parts of ammonia water solutions with equal volumes and 1mol/L concentration, respectively dissolving aniline A and ammonium persulfate A in the two parts of ammonia water solutions to obtain 0.02-0.08 mol/L aniline A solution and 0.005-0.02 mol/L ammonium persulfate A solution, wherein the concentration ratio of the aniline A solution to the ammonium persulfate A solution is 4: 1; then slowly pouring the ammonium persulfate A solution into the aniline A solution, stirring at the temperature of 20-25 ℃ and the rotating speed of 500-600 r/min for 10-15 min, reacting at the normal temperature for 3h, heating at the constant temperature of 40 ℃ for 2h, and removing ammonia gas in the mixed solution to obtain a first mixed solution;
s3, preparing two parts of composite acid solutions with equal volume and concentration of 0.1mol/L, respectively dissolving aniline B and ammonium persulfate B into the two parts of composite acid solutions to prepare aniline B solution with concentration of 0.1-0.4 mol/L and ammonium persulfate B solution with concentration of 0.025-0.1 mol/L, wherein the concentration ratio of the aniline B solution to the ammonium persulfate B solution is 4:1, then slowly pouring the ammonium persulfate B solution into the aniline B solution, and mechanically stirring at the rotating speed of 500-600 r/min for 10-15 min at the temperature of 20-25 ℃ to uniformly mix the solutions to obtain a second mixed solution;
s4, slowly pouring the second mixed solution into the first mixed solution according to the volume of 1:1, stirring while adding, after mixing, fully immersing the modified fiber balls prepared in the S1 into the solution according to the adding proportion of 5-15 g/L, standing for 4-8 h at the temperature of 0-5 ℃, taking out the modified fiber balls, repeatedly cleaning and filtering with deionized water and ethanol until filtrate is clear, placing in an oven, and drying for 12-24 h at the temperature of 50-60 ℃ to prepare the modified fiber ball loaded polyaniline composite material;
wherein, the steps S1, S2 and S3 are not in sequence.
The preparation method of the modified fiber ball loaded polyaniline composite material is further improved as follows:
preferably, H in step S12O2The concentration of the solution was 10 g/L.
Preferably, the composite acid solution is obtained by mixing tartaric acid and hydrochloric acid with the mass fraction of 20-38 wt%, and the molar ratio of tartaric acid to hydrochloric acid in the composite acid solution is 1: 1.
In order to solve another technical problem, the invention adopts the technical scheme that the modified fiber ball loaded polyaniline composite material is used for removing Cr (VI) in a water body.
The technical proposal of further use of the polyaniline composite material loaded on the modified fiber spheres in removing Cr (VI) in water is as follows:
preferably, the pH value of the water body is 5-7, the concentration of Cr (VI) in the water body is 1-30 mg/L, and the addition concentration of the modified fiber ball loaded polyaniline composite material is more than 2 g/L.
Preferably, the addition concentration of the modified fiber ball loaded polyaniline composite material is 2-6 g/L.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention discloses a modified fiber ball loaded polyaniline (PANI/m-FB) composite material, which adopts a fiber ball filter material as a carrier to load polyaniline, fully utilizes the advantages of the polyaniline and the PANI, avoids secondary pollution of nano-scale polyaniline, and improves the capability of the fiber ball filter material in absorbing and reducing heavy metal ions.
(2) The invention discloses a preparation method of a modified fiber ball loaded polyaniline (PANI/m-FB) composite material, which takes a cheap fiber ball as a load material, improves the attachment rate of polyaniline on the fiber ball by modifying the fiber ball, and prepares a macroscopic scale modified fiber ball loaded one-dimensional nano filamentous polyaniline composite material by a simple and easily controlled seed polymerization method without a template; compared with the traditional chemical oxidation polymerization method, the aniline oligomer generated in ammonia water during the preparation of the composite material by the seed polymerization method has lower oxidation potential, can be used as a seed to induce the oriented growth of a polyaniline chain, and greatly accelerates the reaction speed. The preparation process has the advantages of low cost, simple process, high reaction speed and easy large-scale production.
(2) The PANI/m-FB composite material prepared by the invention can be applied to the field of sewage treatment and is suitable for large-scale industrial application. When the composite material is used for removing Cr (VI) in sewage, the removal capacity can reach 291.13mg/g under the weak acid condition of pH 5, and after the composite material is repeatedly used for many times, the removal rate can still reach 90%, so that secondary pollution is not easily caused.
Drawings
FIG. 1(a) is a Scanning Electron Micrograph (SEM) of the PANI/m-FB composite material of the present invention, and FIG. 1(b) is an enlarged view of FIG. 1 (a).
FIG. 2(a) is a graph of the concentration of heavy metal ions as a function of time for the PANI/m-FB composite material of the present invention for removing Cr (VI) from wastewater; FIG. 2(b) is a graph showing the change of the removal capacity of the PANI/m-FB composite material in accordance with the increase of the initial Cr (VI) concentration in the solution when the PANI/m-FB composite material is used for removing Cr (VI) in sewage, wherein the inset is a graph showing the change of the Cr (VI) removal rate at a concentration of 1-100 mg/L.
FIG. 3(a) is a histogram of the removal rate of the PANI/m-FB composite material prepared by the present invention after multiple cycles; FIG. 3(b) is a Fourier Infrared Spectroscopy (FTIR) of the PANI/m-FB composite prepared in accordance with the present invention after multiple cycles.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.
Example 1
1. Preparing modified fiber balls: h with a mass of 10g2O2Dissolving the solution in 1000mL deionized water, adding 10g of cleaned fiber balls, and stirring at room temperature for 24h to obtain modified fiber balls;
2. preparing polyaniline:
weighing two parts of 3.85mL (0.1mol) ammonia water, and respectively dissolving the two parts of the ammonia water in two parts of 100mL deionized water to prepare two parts of 1mol/L ammonia water solution; 0.4471g (4.8mmol) of aniline A is dissolved in a portion of ammonia water solution and stirred for 10min at room temperature to obtain aniline A solution; ammonium persulfate A (0.2738 g, 1.2mmol) was dissolved in another part of the aqueous ammonia solution, and the solution was stirred at room temperature for 10min to obtain an ammonium persulfate A solution. Subsequently, the ammonium persulfate A solution was slowly poured into the aniline A solution, and mechanical stirring was continued for 15min at a stirring speed of 600r/min and at a temperature of 25 ℃. Subsequently, after the mixed solution was reacted at room temperature for 3 hours, the mixed solution was heated at a constant temperature of 40 ℃ for 2 hours to remove ammonia gas from the solution, to obtain a first mixed solution.
Dissolving hydrochloric acid with the volume of 0.85mL (10mmol) and tartaric acid with the mass of 1.5009g (10mmol) in deionized water with the volume of 100mL together to obtain a complex acid solution with the concentration of 0.1mol/L, and preparing two complex acid solutions by the same method; 1.8628g (20mmol) of aniline B is dissolved in one part of composite acid solution, and the mixture is stirred for 10min at room temperature to prepare aniline B solution; 1.1410g (5 mmol) of ammonium persulfate B was dissolved in another part of the complex acid solution, and stirred at room temperature for 10min to prepare an ammonium persulfate B solution. And slowly pouring the ammonium persulfate B solution into the aniline B solution, and continuously mechanically stirring for 15min at the stirring speed of 600r/min and the temperature of 25 ℃ to obtain a second mixed solution.
3. Preparing a composite material:
slowly pouring the second mixed solution into the first mixed solution according to the volume of 1:1, stirring while adding, after mixing, immersing 3g of modified fiber balls into the mixed solution, and standing for 6 hours at 0 ℃. And then, taking out the modified fiber balls, repeatedly washing with deionized water and ethanol, and filtering until the filtrate is clear. And finally, putting the modified fiber balls into an oven, and drying for 24 hours at the temperature of 60 ℃ to obtain a modified fiber ball loaded polyaniline composite material sample 1.
The modified fiber ball-supported polyaniline composite material sample 1 prepared above was subjected to electron microscope scanning, and the result is shown in fig. 1. As can be seen from fig. 1(a), polyaniline is uniformly and densely attached to the fiber ball; as can be seen from FIG. 1(b), the polyaniline structure is a one-dimensional nano-filamentous structure, the diameter of polyaniline in the nano-filamentous structure is 190 + -10 nm, and the length is 1-1.5 μm.
Example 2
Substantially the same as in example 1 except that the mass of aniline B was changed to 3.7256g (40 mmol) and the mass of ammonium persulfate B was 2.2820g (10mmol), sample 2 of a modified fiber ball composite material was prepared.
Preparing a 150mL sewage water sample, wherein the pH value of the water sample is 5, the concentration of Cr (VI) in the water sample is 10mg/L, adding 1.0g of the modified fiber ball loaded polyaniline composite material sample 2 prepared in the step into sewage, and measuring the change of the concentration of the residual heavy metal ions in the sewage along with time, wherein the test result is shown in a figure 2 (a);
preparing a plurality of 150ml sewage water samples, wherein the pH value of the water samples is 5, the Cr (VI) concentration in the water samples is increased within the range of 0-250 mg/L, and the Cr (VI) concentration is 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 150, 165, 190, 200 and 240mg/L respectively. Adding 1.0g of modified fiber ball loaded polyaniline composite material sample 2 into each water sample, reacting for 5h, and testing the change curve of the composite material Cr (VI) removing capacity along with the increase of the initial Cr (VI) concentration in the solution, wherein the test result is shown in fig. 2 (b).
As can be seen from FIG. 2(a), after the PANI/m-FB composite material is added into the sewage and reacts for 5 hours, the concentration of the residual Cr (VI) in the solution is almost 0, and the removal rate can almost reach 100%; as can be seen from FIG. 2(b), when the concentration of Cr (VI) in the water body is 240mg/L, the Q value reaches 291.13mg/g, and hardly changes, and the curve tends to be horizontal, which indicates that the maximum removal capacity of the PANI/m-FB composite material for Cr (VI) in sewage can reach 291.13 mg/g; as can be seen from the inset in the lower right corner of FIG. 2(b), the removal rate of the composite material decreases with the increase of the concentration of Cr (VI) in the water body, but the removal rate of the composite material can be maintained above 90% within the concentration range of 1-30 mg/L.
Example 3
Substantially the same as in example 1 except that the mass of aniline a was changed to 0.5961g (6.4 mmol) and the mass of ammonium persulfate a was changed to 0.3651g (1.6mmol), sample 3 of a modified fiber ball composite material was prepared.
150mL of sewage with Cr (VI) concentration of 10mg/L and pH of 5 is prepared, the composite material is divided into two groups for testing the recycling and regeneration performance, two 1.0g samples 3 of the modified fiber ball loaded polyaniline composite material prepared above are added into two parts of sewage for removing Cr (VI) in the sewage, then the sewage is taken out for recycling, one part of the samples 3 after Cr (VI) treatment is carried out on the sewage before recycling, the other part is not subjected to acid treatment, then the infrared spectrum test is carried out on the two parts of samples 3 of the modified fiber ball loaded polyaniline composite material, the removal rate bar chart is shown in figure 3(a), and the Fourier infrared spectrum (FTIR) is shown in figure 3 (b).
It can be seen from fig. 3(a) that the acid-treated composite material sample 3 has a higher removal rate than the non-acid-treated composite material sample 3 when it is used again to treat cr (vi) in sewage, and the removal rate can still reach 90% after many cycles. In fig. 3(b), curves 1, 2 and 3 represent the ir curves of the composite material not used for cr (vi) treatment, the composite material not treated after cr (vi) removal, and the composite material acid-treated after cr (vi) removal, respectively, and it can be seen that the characteristic peaks of the composite material acid-treated are consistent with those of the composite material not used for cr (vi) treatment, indicating that the composite material is reproducible under acidic conditions and has good recycling performance.
It should be understood by those skilled in the art that the foregoing is only illustrative of several specific embodiments of the invention, and is not exhaustive of the invention. It should be noted that many variations and modifications are possible to those skilled in the art, and all variations and modifications that do not depart from the scope of the invention as set forth in the claims should be deemed to be a part of the disclosure.
Claims (8)
1. The polyaniline-loaded modified fiber ball composite material is characterized in that the composite material is of a spherical structure with the diameter of 4-5 cm, the spherical structure comprises a modified fiber ball located in the center and polyaniline with a nano-filamentous structure loaded on the modified fiber ball, the modified fiber ball is prepared by modifying the fiber ball, the mass ratio of the modified fiber ball to the polyaniline is (3-5): 1-5, the polyaniline with the nano-filamentous structure has the diameter of 190 +/-10 nm and the length of 1-1.5 mu m.
2. The modified fiber of claim 1The fiber ball loaded polyaniline composite material is characterized in that the main material of the fiber ball is polyester fiber, the diameter of the fiber ball is 0.8-1 mm, and the density of the fiber ball is 1.2-1.5 g/cm3The specific surface area is 2000-3000 m2/m3。
3. The preparation method of the modified fiber ball-supported polyaniline composite material of claim 1 or 2, which is characterized by comprising the following steps:
s1, immersing the fiber balls in deionized water, drying in an oven at 50-60 ℃ to constant weight after ultrasonic cleaning, weighing 8-10 g of dried fiber balls, and putting the dried fiber balls into 1000mL of H with the concentration of 5-20 g/L2O2Stirring the solution at room temperature for 12-24 hours at the stirring speed of 400-500 r/min, taking out the fiber balls, and drying the fiber balls in an oven at the temperature of 50-60 ℃ to prepare modified fiber balls;
s2, preparing two parts of ammonia water solutions with equal volumes and concentration of 1mol/L, respectively dissolving aniline A and ammonium persulfate A in the two parts of ammonia water solutions to prepare aniline A solution with concentration of 0.02-0.08 mol/L and ammonium persulfate A solution with concentration of 0.005-0.02 mol/L, wherein the concentration ratio of the aniline A solution to the ammonium persulfate A solution is 4:1, slowly pouring the ammonium persulfate A solution into the aniline A solution, stirring at the rotating speed of 500-600 r/min for 10-15 min at the temperature of 20-25 ℃, reacting for 3h at normal temperature, heating at the constant temperature of 40 ℃ for 2h, removing ammonia gas in the mixed solution to obtain a first mixed solution;
s3, preparing two parts of composite acid solutions with equal volumes and concentration of 0.1mol/L, respectively dissolving aniline B and ammonium persulfate B into the two parts of composite acid solutions to prepare aniline B solution with concentration of 0.1-0.4 mol/L and ammonium persulfate B solution with concentration of 0.025-0.1 mol/L, wherein the concentration ratio of the aniline B solution to the ammonium persulfate B solution is 4:1, slowly pouring the ammonium persulfate B solution into the aniline B solution, and mechanically stirring at the rotating speed of 500-600 r/min for 10-15 min at the temperature of 20-25 ℃ to uniformly mix the solutions to obtain a second mixed solution;
s4, slowly pouring the second mixed solution into the first mixed solution according to the volume of 1:1, stirring while adding, after mixing, fully immersing the modified fiber balls prepared in the S1 into the solution according to the adding proportion of 5-15 g/L, standing for 4-8 h at the temperature of 0-5 ℃, taking out the modified fiber balls, repeatedly cleaning and filtering with deionized water and ethanol until filtrate is clear, placing in an oven, and drying for 12-24 h at the temperature of 50-60 ℃ to prepare the modified fiber ball loaded polyaniline composite material;
wherein, the steps S1, S2 and S3 are not in sequence.
4. The method for preparing the modified fiber ball-supported polyaniline composite material as claimed in claim 3, wherein H in step S12O2The concentration of the solution was 10 g/L.
5. The preparation method of the modified fiber ball-supported polyaniline composite material as claimed in claim 3, wherein the complex acid solution is obtained by mixing tartaric acid and hydrochloric acid with a mass fraction of 20-38 wt%, and the molar ratio of tartaric acid to hydrochloric acid in the complex acid solution is 1: 1.
6. Use of the modified fiber sphere-supported polyaniline composite material of claim 1 or 2 for removing cr (vi) in a water body.
7. The use of the modified fiber ball-supported polyaniline composite material in water according to claim 6, wherein the pH of the water is 5-7, the concentration of Cr (VI) in the water is 1-30 mg/L, and the addition concentration of the modified fiber ball-supported polyaniline composite material is more than 2 g/L.
8. The use of the modified fiber sphere-supported polyaniline composite material in water for removing Cr (VI) in water according to claim 7, wherein the addition concentration of the modified fiber sphere-supported polyaniline composite material is 2-6 g/L.
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