CN114425310A - Modified polyaniline adsorbent and preparation method and application thereof - Google Patents
Modified polyaniline adsorbent and preparation method and application thereof Download PDFInfo
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- CN114425310A CN114425310A CN202011187522.9A CN202011187522A CN114425310A CN 114425310 A CN114425310 A CN 114425310A CN 202011187522 A CN202011187522 A CN 202011187522A CN 114425310 A CN114425310 A CN 114425310A
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- triaminobenzene
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- 229920000767 polyaniline Polymers 0.000 title claims abstract description 51
- 239000003463 adsorbent Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims abstract description 66
- RUOKPLVTMFHRJE-UHFFFAOYSA-N benzene-1,2,3-triamine Chemical compound NC1=CC=CC(N)=C1N RUOKPLVTMFHRJE-UHFFFAOYSA-N 0.000 claims abstract description 36
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 21
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 19
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000005406 washing Methods 0.000 claims abstract description 13
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- 229920000642 polymer Polymers 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 5
- 239000012498 ultrapure water Substances 0.000 claims description 5
- JSYBAZQQYCNZJE-UHFFFAOYSA-N benzene-1,2,4-triamine Chemical compound NC1=CC=C(N)C(N)=C1 JSYBAZQQYCNZJE-UHFFFAOYSA-N 0.000 claims description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- RPHKINMPYFJSCF-UHFFFAOYSA-N benzene-1,3,5-triamine Chemical compound NC1=CC(N)=CC(N)=C1 RPHKINMPYFJSCF-UHFFFAOYSA-N 0.000 claims description 2
- 238000007334 copolymerization reaction Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 30
- 239000010865 sewage Substances 0.000 abstract description 8
- 229920001577 copolymer Polymers 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 23
- 150000002500 ions Chemical class 0.000 description 10
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 7
- 239000002131 composite material Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000001237 Raman spectrum Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 125000001841 imino group Chemical group [H]N=* 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 229910001430 chromium ion Inorganic materials 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 235000001759 Citrus maxima Nutrition 0.000 description 1
- 244000276331 Citrus maxima Species 0.000 description 1
- 229910000708 MFe2O4 Inorganic materials 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- DAVOZYNLPXEIEH-UHFFFAOYSA-N aniline;azane Chemical compound N.NC1=CC=CC=C1 DAVOZYNLPXEIEH-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 210000003734 kidney Anatomy 0.000 description 1
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
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- 239000012286 potassium permanganate Substances 0.000 description 1
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- 229920005989 resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 238000004729 solvothermal method Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01J20/264—Synthetic macromolecular compounds derived from different types of monomers, e.g. linear or branched copolymers, block copolymers, graft copolymers
-
- 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
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
Abstract
The invention relates to a modified polyaniline adsorbent and a preparation method and application thereof, wherein the adsorbent is a copolymer of triaminobenzene and aniline, and the molar ratio of triaminobenzene to aniline is 0.05: 1-0.8: 1. Adding triaminobenzene and aniline into dilute sulfuric acid solution, stirring and dissolving, and keeping stirring at the temperature of 0-50 ℃; then, dropwise adding an ammonium persulfate aqueous solution into the solution at the dropping speed of 10-50 ml/h, and stirring for reacting for 8-48 hours; and then washing the product to obtain the granular nitrogen-rich polyaniline material for treating the sewage containing the heavy metals. Compared with the prior art, the invention has the advantages of large adsorption capacity, simple preparation and the like.
Description
Technical Field
The invention belongs to the field of pollution treatment, and particularly relates to a modified polyaniline adsorbent, and a preparation method and application thereof.
Background
With the progress of industrialization, people pay more and more attention to environmental protection and life health, the rapid development of economy and industry also brings damage to the ecological environment, and environmental pollution becomes an important factor restricting social development. Water resources are the most important resources for people to live and develop, but the water environment problem in China is prominent at present, the wastewater discharge standard is increasingly strict, and the water treatment cost of industrial enterprises is high. Heavy metal pollution of a water body brings huge economic loss and ecological damage, heavy metal ions cause serious damage to aquatic organisms and human bodies, and lead mainly exists in a compound form in nature and can damage a nervous system, a digestive system and kidneys after being ingested by the human bodies. The development of an economical and efficient lead ion removal method is an urgent problem to be solved urgently.
In the prior art, an adsorption method is mostly adopted for treating heavy metal ions in wastewater, and the method has the advantages of simplicity in operation, wide application range and the like. The adsorbent is a key factor determining the adsorption efficiency and cost, and the most industrially used adsorbent at present is activated carbon, which is modified to improve the adsorption capacity of heavy metals. For example, in the patent technology of 'a sewage treatment adsorbent and a preparation and use method thereof' (CN 109289780A), the modified corncob, the modified shaddock peel and the activated carbon are mixed, and the adsorption capacity of heavy metals is improved by a method of increasing the surface pores of the adsorbent. The patent technology of 'a recyclable sewage treatment adsorbent' (CN 105771931A) comprises the steps of obtaining modified activated carbon through acid leaching and alkali leaching, and then uniformly mixing with hydrochloric acid modified sepiolite, expanded vermiculite, hollow brick particles and glass beads to obtain the recyclable sewage treatment adsorbent comprising macroporous adsorption resin and inorganic adsorption components. The patent technology of 'a preparation method of modified activated carbon for synchronously removing heavy metals and organic matters in sewage' (CN 108479698A) comprises the steps of pretreating activated carbon, soaking the pretreated activated carbon in potassium permanganate and hydrogen peroxide, soaking the soaked activated carbon in acetic acid and sodium acetate, baking the baked activated carbon at 500-600 ℃ in a nitrogen atmosphere, soaking the baked activated carbon in a sodium dodecyl sulfate solution, baking the baked activated carbon, and deeply activating the baked activated carbon by using steam to prepare the activated carbon with heavy metal adsorption capacity. However, the powdery adsorbent is difficult to separate and recover when dispersed in liquid, and is easy to cause secondary pollution.
In order to solve the problem, the magnetic composite adsorbent is formed by compounding a magnetic nano material and a carbon-based material. Magnetic nano-meterThe material has the advantages of recycling by applying an external magnetic field, economy and high efficiency. For example, in the patent technology of 'a preparation method and application of a general magnetic adsorbent' (CN 108393073A), a solvothermal method is adopted to synthesize carbon and magnetic spinel type ferrite MFe at 170-250 DEG C2O4Hybrid nanocomposite MFe2O4a/C magnetic adsorbent. Although the method solves the problem of solid-liquid separation, a special method is needed for preparing the magnetic material, the process is complex, the cost is high, and the industrial production is difficult.
Patent application CN111715195A discloses a copper slag polyaniline magnetic composite adsorbent and a preparation method thereof. The copper slag polyaniline magnetic composite adsorbent prepared by the in-situ polymerization method is a copper slag polyaniline composite material with a core-shell structure, and the shell is formed by stacking fiber rod-shaped polyaniline, so that the copper slag polyaniline magnetic composite adsorbent has a rich pore structure and a large specific surface area; meanwhile, the surface of the material has rich amino and imino functional groups, and the material has triple adsorption effects of electrostatic adsorption, reduction adsorption and chelation reaction on heavy metal ions, and has strong adsorption capacity and high adsorption efficiency. The adsorbent loads polyaniline on other substances, improves the adsorption capacity and the adsorption efficiency of the polyaniline in a mode of improving the specific surface area of the polyaniline, but has poor effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a modified polyaniline adsorbent with large adsorption capacity and high adsorption efficiency, and a preparation method and application thereof.
The purpose of the invention can be realized by the following technical scheme: a modified polyaniline adsorbent is prepared by copolymerization of triaminobenzene and aniline, wherein in a polymer, the molar ratio of nitrogen atoms to phenyl groups is more than 1 and less than 2.3; the molar ratio of triaminobenzene to aniline is 0.05: 1-0.8: 1.
Further, the triaminobenzene is 1,2, 3-triaminobenzene, 1,2, 4-triaminobenzene or 1,3, 5-triaminobenzene. Triaminobenzene has three amino groups, and can react with trisubular aniline in the oxidation polymerization process to form a net structure. In addition, compared with aniline, triaminobenzene has three times of nitrogen atoms, so that more imino and amino groups can be provided, and adsorption of heavy metals by the polymer is facilitated.
Furthermore, the molar ratio of the triaminobenzene to the aniline is 0.4: 1-0.7: 1.
The preparation method of the modified polyaniline adsorbent comprises the steps of adding triaminobenzene and aniline into a dilute sulfuric acid solution, stirring and dissolving, and keeping stirring at the temperature of 0-50 ℃; then, dropwise adding an ammonium persulfate aqueous solution into the solution at the dropping speed of 10-50 ml/h, and stirring for reacting for 8-48 hours; and washing the product to obtain the granular nitrogen-rich polyaniline material.
Furthermore, triaminobenzene and aniline are used as reaction monomers, and the molar ratio of ammonium persulfate to the reaction monomers is 0.5: 1-2: 1.
Further, the molar ratio of ammonium persulfate to the reaction monomer is 1.2: 1-1.6: 1.
Further, the concentration of dilute sulfuric acid dissolving triaminobenzene and aniline is 1 mol/L.
Furthermore, the concentration of dissolving triaminobenzene and aniline in dilute sulfuric acid solution is 2-300 mmol/L.
Further, washing the product, performing multiple centrifugal washing by using ultrapure water and absolute ethyl alcohol, and drying at 50-70 ℃ after washing.
The modified polyaniline adsorbent is applied to treating sewage containing heavy metals.
The polyaniline material contains a large amount of amino and imino groups, has a good complexing effect on heavy metal ions, and thus has a good adsorption effect on heavy metal particles. In addition, the polyaniline has the advantages of low price of raw materials, easy synthesis and high stability, and is very suitable for industrialization of heavy metal ion adsorption. However, in the traditional polyaniline synthesis method, aniline is used as a raw material, an oxidant aniline is added to polymerize the polyaniline, and the molar ratio of amino or imino groups to benzene rings of the obtained polyaniline is basically kept at 1: 1. When the molar ratio of triaminobenzene to aniline is 6:10, the adsorption capacity of lead ions and chromium ions reaches the maximum value, which is 1.50 and 1.36 times of that of pure polyaniline.
Drawings
FIG. 1 is a scanning electron micrograph of a granular nitrogen-rich polyaniline material obtained in example 4;
FIG. 2 is a scanning electron micrograph of the particulate nitrogen-rich polyaniline material obtained in example 6;
FIG. 3 is a scanning electron micrograph of polyaniline of comparative example 1;
FIG. 4 is a Raman spectrum of a sample obtained in examples 1 to 3.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples 1 to 7
According to the formula in the table 1, accurately weighed raw materials (triaminobenzene and aniline) are placed in a 100ml conical flask and dissolved by adding a solvent (dilute sulfuric acid), accurately weighed ammonium persulfate APS is placed in a centrifuge tube and dissolved by adding the solvent (dilute sulfuric acid), and is placed in an ice water bath for magnetic stirring and cooling for 1 hour until the temperature is reduced to 0 ℃, then an APS solution is dripped into the raw material solution at the speed of 20ml/h, stirring and reacting for 24 hours after dripping is finished, after the reaction is finished, ultrapure water is used for centrifugal washing for 3 times, absolute ethyl alcohol is used for centrifugal washing for 3 times, and the raw material is placed in an oven at the temperature of 60 ℃ for drying, so that the nitrogen-enriched polyaniline taking different raw materials as monomers is obtained.
The amount of triaminobenzene in the raw material is 0, and the rest of the examples are the same.
Table 1 formulation table of amounts of raw materials used in examples 1 to 7 and comparative document 1 (in which a molar ratio of ammonium persulfate is 1.5 times a total molar amount of triaminobenzene and aniline)
| Examples | Triaminobenzene | Aniline | Ammonium persulfate | Amount of solvent (the solvent is 1mol sulfuric acid) |
| 1 | 10mmol | 10mmol | 30mmol | 300ml |
| 2 | 9mmol | 10mmol | 28.5mmol | 300ml |
| 3 | 8mmol | 10mmol | 27mmol | 300ml |
| 4 | 7mmol | 10mmol | 25.5mmol | 300ml |
| 5 | 6mmol | 10mmol | 24mmol | 300ml |
| 6 | 4mmol | 10mmol | 21mmol | 300ml |
| 7 | 2mmol | 10mmol | 18mmol | 300ml |
| Comparative example 1 | 0mmol | 10mmol | 15mmol | 300ml |
The electron micrographs of the nitrogen-rich aniline polymers prepared by the methods of examples 4 and 6 are shown in fig. 1-2, and the electron micrographs of the polyaniline (without the addition of triaminobenzene) obtained in comparative example 1 are shown in fig. 3, which shows that the polyaniline prepared is in the form of particles, and the particles have pores for the diffusion and adsorption of metal ions.
FIG. 4 shows the Raman spectra of the samples obtained in examples 1-3, and the Raman spectra of the materials obtained in examples 1,2 and 3 from top to bottom, respectively, and it can be seen that the products of the three examples all conform to the characteristic Raman spectrum of polyaniline.
The aniline polymers obtained in the above examples and comparative examples were subjected to a test for the adsorption amount of heavy metal ions by the following method:
weighing 0.1 dry polyaniline sample, placing the sample in a 100ml beaker, adding heavy metal ion solution, placing the sample in an oscillator, oscillating at 100RPM (revolution per minute) at room temperature, centrifuging after two hours, testing the concentration of supernatant by adopting a spectrophotometer method, and calculating the amount of heavy metal ions adsorbed by the sample and the saturated adsorption amount according to the change of solution concentration, wherein the results are shown in Table 2:
TABLE 2 adsorption Capacity of Aniline polymers obtained in examples and comparative examples to heavy metals
As can be seen from Table 2, when the molar ratio of the triphenylamino group to the aniline exceeds 0.8, the ratio to Pb is higher2+And Cr6+The adsorption capacity is not as good as that of a comparative example without adding triphenylamino, and when the molar ratio of the benzenetriamine to the aniline is 6:10, the adsorption amounts of lead ions and chromium ions reach maximum values, which are 1.50 and 1.36 times of the adsorption amount of pure polyaniline.
Example 8
Adding triaminobenzene and aniline into a 1mol/L dilute sulfuric acid solution according to the molar ratio of 1.2:1, stirring and dissolving to obtain a reaction monomer solution, and keeping stirring at the temperature of 25 ℃; then, dropwise adding an ammonium persulfate aqueous solution into the reaction monomer solution at the dropping speed of 10ml/h, taking triaminobenzene and aniline as reaction monomers, and stirring and reacting for 8 hours with the molar ratio of ammonium persulfate to the reaction monomers being 0.5: 1; and then, carrying out multiple times of centrifugal washing on the product by adopting ultrapure water and absolute ethyl alcohol, and drying at 50 ℃ after washing to obtain the granular nitrogen-rich polyaniline material.
The obtained granular nitrogen-rich polyaniline material is used for treating heavy metal-containing sewage, and the adsorption capacity of the polyaniline (without the addition of triaminobenzene) obtained in the comparative example 1 is improved by 1.4 times under the same conditions.
Example 9
Adding triaminobenzene and aniline into a 1mol/L dilute sulfuric acid solution according to the molar ratio of 1.6:1, stirring and dissolving to obtain a reaction monomer solution, and keeping stirring at the temperature of 50 ℃; then, dropwise adding an ammonium persulfate aqueous solution into the reaction monomer solution at a speed of 50ml/h, taking triaminobenzene and aniline as reaction monomers, and stirring and reacting for 48 hours with the molar ratio of ammonium persulfate to the reaction monomers being 2: 1; and then, carrying out multiple times of centrifugal washing on the product by adopting ultrapure water and absolute ethyl alcohol, and drying at 70 ℃ after washing to obtain the granular nitrogen-rich polyaniline material.
The obtained granular nitrogen-rich polyaniline material is used for treating heavy metal-containing sewage, and the adsorption capacity of the polyaniline (without the addition of triaminobenzene) obtained in the comparative example 1 is improved by 1.45 times under the same conditions.
Claims (10)
1. The modified polyaniline adsorbent is characterized in that the adsorbent is modified polyaniline prepared by copolymerization of triaminobenzene and aniline, and the molar ratio of nitrogen atoms to phenyl in a polymer is more than 1 and less than 2.3; the molar ratio of triaminobenzene to aniline is 0.05: 1-0.8: 1.
2. The modified polyaniline adsorbent as described in claim 1, wherein the triaminobenzene is 1,2, 3-triaminobenzene, 1,2, 4-triaminobenzene or 1,3, 5-triaminobenzene.
3. The modified polyaniline adsorbent as described in claim 1, wherein the molar ratio of triaminobenzene to aniline is 0.4:1 to 0.7: 1.
4. A method for preparing the modified polyaniline adsorbent as described in any one of claims 1 to 3, wherein triaminobenzene and aniline are added into the dilute sulfuric acid solution and dissolved by stirring, and the stirring is maintained at a temperature of 0 to 50 ℃; then, dropwise adding an ammonium persulfate aqueous solution into the solution at the dropping speed of 10-50 ml/h, and stirring for reacting for 8-48 hours; and washing the product to obtain the granular nitrogen-rich polyaniline material.
5. The preparation method of the modified polyaniline adsorbent according to claim 4, wherein triaminobenzene and aniline are used as reaction monomers, and the molar ratio of ammonium persulfate to the reaction monomers is 0.5: 1-2: 1.
6. The preparation method of the modified polyaniline adsorbent according to claim 5, wherein the molar ratio of ammonium persulfate to the reaction monomer is 1.2: 1-1.6: 1.
7. The method for preparing a modified polyaniline adsorbent as described in claim 4, wherein the concentration of the dilute sulfuric acid dissolving triaminobenzene and aniline is 1 mol/L.
8. The method for preparing a modified polyaniline adsorbent as claimed in claim 4, wherein the concentration of triaminobenzene and aniline dissolved in dilute sulfuric acid solution is 2-300 mmol/L.
9. The preparation method of the modified polyaniline adsorbent according to claim 4, wherein the product is washed by multiple centrifugal washing with ultrapure water and absolute ethyl alcohol, and dried at 50-70 ℃.
10. Use of the modified polyaniline adsorbent as described in any one of claims 1 to 3, wherein the adsorbent is used for treating heavy metal-containing wastewater.
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| CN101787123A (en) * | 2010-03-05 | 2010-07-28 | 中国科学院苏州纳米技术与纳米仿生研究所 | Molecular engram polymer and preparation and application thereof |
| CN102962039A (en) * | 2012-12-06 | 2013-03-13 | 西北师范大学 | Preparation method and application of modification polyanion sorption agent |
| CN111715195A (en) * | 2020-06-22 | 2020-09-29 | 武汉科技大学 | Copper slag polyaniline magnetic composite adsorbent and preparation method thereof |
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| CN101787123A (en) * | 2010-03-05 | 2010-07-28 | 中国科学院苏州纳米技术与纳米仿生研究所 | Molecular engram polymer and preparation and application thereof |
| CN102962039A (en) * | 2012-12-06 | 2013-03-13 | 西北师范大学 | Preparation method and application of modification polyanion sorption agent |
| CN111715195A (en) * | 2020-06-22 | 2020-09-29 | 武汉科技大学 | Copper slag polyaniline magnetic composite adsorbent and preparation method thereof |
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