CN115055172A - Preparation method and application of polyion liquid modified MXene adsorbent - Google Patents
Preparation method and application of polyion liquid modified MXene adsorbent Download PDFInfo
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- 239000003463 adsorbent Substances 0.000 title claims abstract description 54
- 239000007788 liquid Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 229920000831 ionic polymer Polymers 0.000 title claims abstract description 28
- 239000002135 nanosheet Substances 0.000 claims abstract description 109
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 66
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims abstract description 45
- LINPIYWFGCPVIE-UHFFFAOYSA-N 2,4,6-trichlorophenol Chemical compound OC1=C(Cl)C=C(Cl)C=C1Cl LINPIYWFGCPVIE-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000003756 stirring Methods 0.000 claims abstract description 28
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 24
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical compound FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 claims abstract description 14
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- 229910052786 argon Inorganic materials 0.000 claims abstract description 12
- 238000010926 purge Methods 0.000 claims abstract description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 45
- 238000006243 chemical reaction Methods 0.000 claims description 42
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000000243 solution Substances 0.000 claims description 23
- 239000007864 aqueous solution Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 239000008367 deionised water Substances 0.000 claims description 19
- 229910021641 deionized water Inorganic materials 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 14
- 239000003292 glue Substances 0.000 claims description 11
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000000944 Soxhlet extraction Methods 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 9
- -1 chlorophenol compound Chemical class 0.000 claims description 7
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical class OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 4
- IYHLUGVVUPPBEJ-UHFFFAOYSA-N 1-butyl-3-ethenyl-1,2-dihydroimidazol-1-ium;bromide Chemical compound [Br-].CCCC[NH+]1CN(C=C)C=C1 IYHLUGVVUPPBEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- XALVOFYVVOAYPO-UHFFFAOYSA-M 1-butyl-3-ethenylimidazol-1-ium;bromide Chemical compound [Br-].CCCCN1C=C[N+](C=C)=C1 XALVOFYVVOAYPO-UHFFFAOYSA-M 0.000 abstract description 15
- 239000008204 material by function Substances 0.000 abstract description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 abstract description 2
- 229920002554 vinyl polymer Polymers 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 37
- 238000001179 sorption measurement Methods 0.000 description 21
- 239000000706 filtrate Substances 0.000 description 8
- 238000001914 filtration Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
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- 238000000926 separation method Methods 0.000 description 3
- OSSNTDFYBPYIEC-UHFFFAOYSA-N 1-ethenylimidazole Chemical compound C=CN1C=CN=C1 OSSNTDFYBPYIEC-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000002608 ionic liquid Substances 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- VGVRPFIJEJYOFN-UHFFFAOYSA-N 2,3,4,6-tetrachlorophenol Chemical class OC1=C(Cl)C=C(Cl)C(Cl)=C1Cl VGVRPFIJEJYOFN-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002055 nanoplate Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
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- 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
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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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
- B01J20/264—Synthetic macromolecular compounds derived from different types of monomers, e.g. linear or branched copolymers, block copolymers, graft copolymers
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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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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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
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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Abstract
The invention relates to a preparation method and application of a polyion liquid modified MXene adsorbent, and belongs to the field of nano functional materials. Preparation method of polyion liquid modified MXene adsorbent comprises the steps of adding vinylated MXene nanosheets and 1-vinyl-3-butylimidazolium bromide into methanol according to mass ratio of 1: 1-1: 3 at room temperature, stirring, and adding azobisisobutyronitrile into methanol according to mass ratio of 1: 1-1: 3, stirringAdding azodiisobutyronitrile and a vinyl MXene nanosheet into the solution in a mass ratio of 1: 1-2: 3, adding ethylene glycol dimethacrylate, purging with argon, stirring and reacting at 60 ℃ for 24-48 hours, extracting and drying the product to obtain the polyion liquid modified MXene adsorbent, wherein the MXene nanosheet is Ti 3 C 2 T x Nanosheets. The adsorbent provided by the invention is used for adsorbing 2,4, 6-trichlorophenol (2,4,6-TCP), the removal rate of the 2,4, 6-trichlorophenol can reach 96% at most, and the adsorbent is simple to operate, low in cost and environment-friendly.
Description
Technical Field
The invention relates to a preparation method and application of a polyion liquid modified MXene adsorbent, and belongs to the field of nano functional materials.
Background
With the rapid development of modern industrial production, the pollution of the chlorophenol organic pollutants in the water body is becoming serious. Therefore, the removal of chlorophenol organic matters in the water body by adopting an efficient method is not slow. At present, the treatment methods for chlorophenol organic pollutants in water mainly include an advanced oxidation method, an extraction method, an activated sludge method, an adsorption method and the like. Among them, the adsorption method is widely used because of its advantages such as high adsorption efficiency, low cost, and simple operation.
Two-dimensional transition metal carbides, nitrides and carbonitrides (MXene) are an emerging class of two-dimensional layered structure materials. Has attracted people's extensive attention in the field of environmental application. The MXene nanosheets have the characteristics of high specific surface area, good hydrophilicity, abundant surface functional groups, controllable surface chemical properties and the like, so that the MXene nanosheets are widely applied to the field of adsorption separation. At present, MXene nano-sheets are mainly used for adsorbing heavy metals and dye pollutants in water and show good adsorption removal effect. However, MXene nanosheets are easy to stack and have negative charges on the surface in a water body, so that the problems of low adsorption removal rate, poor selectivity, low speed and the like of organic pollutants such as chlorophenols are caused. In addition, MXene nanosheets as adsorbing materials have the defects of being difficult to separate and recover, easy to oxidize in water and the like. Therefore, the development of the functional modified MXene chlorophenol compound adsorbent which has high adsorption efficiency and high speed and is easy to separate and recover has very important research significance.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a preparation method of a high-performance phenolic compound adsorbent. The invention provides a polyion liquid modified MXene adsorbent which is a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet composite material.
Polyionic liquids (PILs) are a special class of polyelectrolytes that are composed of ionic liquid structural units. The PILs have the structural designability of ionic liquid and better mechanical stability of polymers, and are widely applied to organic adsorption separation. The invention designs and prepares a functionalized MXene composite adsorbent (PILs-MXene) grafted and modified by vinyl imidazole polyionic liquid by utilizing the characteristics of abundant surface functional groups and easy functionalization modification of MXene nanosheets. The composite adsorbent has the advantages of high adsorption efficiency, strong selectivity, easy regeneration and the like for the organic pollutants of phenols.
A preparation method of a polyion liquid modified MXene adsorbent comprises the steps of adding a vinylated MXene nanosheet and 1-vinyl-3-butylimidazole bromide salt into methanol at room temperature according to a mass ratio of 1: 1-1: 3, stirring, adding azodiisobutyronitrile into the solution according to a mass ratio of 1: 1-2: 3 of azodiisobutyronitrile to vinylated MXene nanosheet, adding ethylene glycol dimethacrylate, purging with argon, stirring and reacting at 60 ℃ for 24-48 hours, extracting and drying a product to obtain the polyion liquid modified MXene adsorbent, wherein the MXene nanosheet is Ti nanosheet 3 C 2 T x Nanosheets.
In the preparation method of the polyion liquid modified MXene adsorbent, the preferable vinylated MXene nanosheet is prepared by the following method: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into toluene at a mass ratio of 0.5: 1-1: 3, wherein Ti 3 C 2 T x The ratio of the nanosheets to toluene is 1g: 60-120 mL, the nanosheets and toluene react at 60-90 ℃ for 24-48 h, and the product is washed with ethanol and deionized water for 3 times in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
The polyion liquid of the inventionIn the preparation method of the MXene adsorbent, the MXene nanosheet is preferably prepared by the following method: first, Ti is added 3 AlC 2 The powder was slowly added to a reaction flask containing an aqueous HF solution, wherein Ti was added 3 AlC 2 The ratio of the powder to a 40% HF aqueous solution is 1g: 30-100 mL, and the powder and the HF aqueous solution react for 24-72 hours at the temperature of 30-50 ℃; centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 10-30 min, and oscillating for 48-72 h by a shaking table; and finally, freeze-drying the glue solution to obtain the MXene nanosheet.
In the preparation method of the polyion liquid modified MXene adsorbent, the ratio of the vinylated MXene nanosheet to methanol is preferably 1g: 40-100 mL.
In the preparation method of the polyion liquid modified MXene adsorbent, the ratio of the vinylated MXene nanosheet to ethylene glycol dimethacrylate is preferably 1g: 1-4 mL
In the preparation method of the polyion liquid modified MXene adsorbent, preferably, after stirring at room temperature for 4 hours, adding azobisisobutyronitrile into the solution according to the mass ratio of the azobisisobutyronitrile to the vinylated MXene of 1: 1-2: 3, adding ethylene glycol dimethacrylate, purging a reaction bottle with argon for 10 minutes, and stirring at 60 ℃ for reaction for 24-48 hours; and performing Soxhlet extraction on the product by using a mixed solution of methanol and acetic acid for 48 hours, and performing vacuum drying at 60 ℃ for 24 hours to obtain the polyion liquid modified MXene adsorbent.
The invention also aims to provide the polyion liquid modified MXene adsorbent prepared by the method and application of the adsorbent in adsorbing chlorophenol compounds.
The method for adsorbing the chlorophenol compound comprises the step of contacting the polyion liquid modified MXene adsorbent with a liquid containing the chlorophenol compound at room temperature and stirring for a period of time.
Further, the chlorophenol compound is 2,4, 6-trichlorophenol.
The invention has the beneficial effects that: according to the invention, the vinyl imidazole polyionic liquid is grafted on the MXene nanosheet, a large number of positively charged imidazole rings are introduced into the polyionic liquid, so that various adsorption acting forces such as electrostatic action, hydrogen bond action, pi-pi action and the like are provided for the phenol pollutants, a large number of adsorption active sites are increased, and the adsorption performance of MXene on the phenol organic matters in water is greatly improved; in addition, the introduction of the polyion liquid effectively prevents the MXene nanosheets from being stacked, so that the MXene nanosheets are beneficial to full exposure of the adsorption active sites, the stability of the MXene nanosheets is improved, and meanwhile, the composite adsorbent has the advantages of easiness in separation and recovery and the like. The adsorbent provided by the invention is used for adsorbing 2,4, 6-trichlorophenol (2,4,6-TCP), the removal rate of the 2,4, 6-trichlorophenol can reach 96% at most, and the adsorbent is simple to operate, low in cost and environment-friendly.
Drawings
Fig. 1 is an SEM image of MXene nanoplates prepared in example 2 of the present invention.
Fig. 2 is an SEM image of a vinylated MXene nanosheet prepared in example 2 of the present invention.
FIG. 3 is an SEM image of PILs-MXene prepared in example 2 of the present invention.
FIG. 4 shows the removal rate of the adsorbents prepared in examples 1 to 6 of the present invention and comparative examples 1 to 2 for a 20mg/L aqueous solution of 2,4, 6-trichlorophenol. As can be seen from FIG. 4, the adsorbent prepared in example 2 has a removal rate of 2,4, 6-trichlorophenol as high as 96%.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
One of the specific implementation modes is as follows:
a preparation method of a polyion liquid modified MXene adsorbent comprises the following process steps:
(1) preparation of MXene nanosheets: firstly, adding 30-90 ml of HF aqueous solution with the mass concentration of 40% into a reaction bottle, and weighing 2-6 g of Ti 3 AlC 2 Slowly adding the powder into a reaction bottle, stirring for 30min, and reacting for 24-72 h at the temperature of 30-50 ℃. Centrifuging the product with deionized waterAnd (4) after 6-8 times of washing, carrying out ultrasonic stripping for 10-30 min, and oscillating for 48-72 h by a shaking table. Finally, the glue solution is frozen and dried to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheets and vinyltriethoxysilane into toluene according to the mass ratio of 0.5: 1-1: 3, reacting for 24-48 h at 60-90 ℃, and washing the product with ethanol and deionized water for 3 times in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) Preparing a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet adsorbent: firstly, adding a vinylated MXene nanosheet and 1-vinyl-3-butylimidazole bromide in a mass ratio of 1: 1-1: 3 into 80mL of methanol. Stirring for 4 hours at room temperature, adding azobisisobutyronitrile into the solution according to the mass ratio of 1: 1-2: 3 of azobisisobutyronitrile to vinylated MXene nano-sheets, adding 1-4 mL of ethylene glycol dimethacrylate, purging the reaction bottle with argon for 10 minutes, and stirring and reacting for 24-48 hours at 60 ℃. The product is subjected to Soxhlet extraction for 48 hours by using a mixed solution of methanol and acetic acid, and is dried for 24 hours in vacuum at the temperature of 60 ℃ to obtain the PILs-MXene adsorbent.
Example 1
(1) Preparation of MXene nanosheets: firstly, 60ml of HF aqueous solution with the mass concentration of 40 percent is added into a reaction bottle, and 5g of Ti is weighed 3 AlC 2 The powder is slowly added into a reaction bottle and stirred for 30min, and then the reaction is carried out for 24h at the temperature of 50 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 20min, and oscillating for 72h in a shaking table. Finally, freeze-drying the glue solution to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into 70ml of toluene according to the mass ratio of 1:1, reacting for 24h at 60 ℃, and washing the product for 3 times by using ethanol and deionized water in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) Preparing a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet adsorbent: firstly, 1g of vinylated MXene nanosheet and 1-vinyl-3-butylimidazolium bromide are added into 60mL of methanol according to the mass ratio of 1: 1. Stirring at room temperature for 4 hours, adding azobisisobutyronitrile into the solution according to the mass ratio of 1:1 of azobisisobutyronitrile to vinylated MXene nanosheets, adding 1mL of ethylene glycol dimethacrylate, purging the reaction flask with argon for 10 minutes, and stirring at 60 ℃ for 24 hours for reaction. The product is subjected to Soxhlet extraction for 48h by using a mixed solution of methanol and acetic acid, and is dried for 24h in vacuum at the temperature of 60 ℃ to obtain the PILs-MXene adsorbent.
(4) 10mg of PILs-MXene adsorbent, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L, was stirred at 25 ℃ for 4h at 200rpm, and after filtration, the concentration of 2,4,6-TCP in the filtrate after adsorption was measured by a high performance liquid chromatograph, the concentration of 2,4,6-TCP was 8.6mg/L, and the removal rate of 2,4, 6-trichlorophenol was calculated to be 57%.
Example 2
(1) Preparation of MXene nanosheets: firstly, 70ml of HF aqueous solution with the mass concentration of 40% is added into a reaction bottle, and 5g of Ti is weighed 3 AlC 2 The powder is slowly added into a reaction bottle and stirred for 30min, and the reaction is carried out for 48h at the temperature of 35 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 30min, and oscillating for 48h by a shaking table. Finally, freeze-drying the glue solution to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into 80ml of toluene according to the mass ratio of 1:3, reacting for 48 hours at 80 ℃, and washing the product for 3 times by using ethanol and deionized water in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) Preparing a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet adsorbent: firstly, 1g of vinylated MXene nanosheet and 1-vinyl-3-butylimidazolium bromide are added into 80mL of methanol according to the mass ratio of 1: 2. Stirring at room temperature for 4 hours, adding azobisisobutyronitrile into the solution according to the mass ratio of 1:1 of azobisisobutyronitrile to vinylated MXene nanosheets, adding 2mL of ethylene glycol dimethacrylate, purging the reaction flask with argon for 10 minutes, and stirring at 60 ℃ for reaction for 48 hours. The product is subjected to Soxhlet extraction for 48 hours by using a mixed solution of methanol and acetic acid, and is dried for 24 hours in vacuum at the temperature of 60 ℃ to obtain the PILs-MXene adsorbent.
(4) 10mg of PILs-MXene nanosheet, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L are taken, stirred at 25 ℃ for 4h at 200rpm, filtered, and then the concentration of 2,4,6-TCP in the filtrate after adsorption is measured by a high performance liquid chromatograph, the concentration of 2,4,6-TCP is 0.8mg/L, and the removal rate of 2,4, 6-trichlorophenol is calculated to be 96%.
Example 3
(1) Preparation of MXene nanosheets: firstly, 30ml of HF aqueous solution with the mass concentration of 40 percent is added into a reaction bottle, and 2g of Ti is weighed 3 AlC 2 The powder is slowly added into a reaction bottle and stirred for 30min, and then the reaction is carried out for 24h at the temperature of 30 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 30min, and oscillating for 72h by a shaking table. Finally, the glue solution is frozen and dried to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into 120ml of toluene according to the mass ratio of 1:2, reacting for 24h at 60 ℃, and washing the product for 3 times by using ethanol and deionized water in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) Preparing a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet adsorbent: firstly, 1g of vinylated MXene nanosheet and 1-vinyl-3-butylimidazolium bromide are added into 50mL of methanol according to the mass ratio of 1: 3. Stirring at room temperature for 4 hours, adding azobisisobutyronitrile into the solution according to the mass ratio of 1:1 of azobisisobutyronitrile to vinylated MXene nanosheets, adding 2mL of ethylene glycol dimethacrylate, purging the reaction flask with argon for 10 minutes, and stirring at 60 ℃ for reaction for 48 hours. The product is subjected to Soxhlet extraction for 48 hours by using a mixed solution of methanol and acetic acid, and is dried for 24 hours in vacuum at the temperature of 60 ℃ to obtain the PILs-MXene adsorbent.
(4) 10mg of PILs-MXene adsorbent, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L are stirred at the temperature of 25 ℃ and the rpm of 200 for 4h, after filtration, the concentration of 2,4,6-TCP in the filtrate after adsorption is measured by a high performance liquid chromatograph, the concentration of 2,4,6-TCP is 1.2mg/L, and the removal rate of 2,4, 6-trichlorophenol is calculated to be 94%.
Example 4
(1) Preparation of MXene nanosheets: firstly, 90ml of HF aqueous solution with the mass concentration of 40 percent is added into a reaction bottle, and 5g of Ti is weighed 3 AlC 2 The powder is slowly added into the reactor and stirred for 30min, and reacted for 72h at the temperature of 45 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 15min, and oscillating for 48h in a shaking table. Finally, the glue solution is frozen and dried to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into 90ml of toluene according to the mass ratio of 1:2, reacting at 70 ℃ for 24h, and washing the product with toluene and ethanol in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) Preparing a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet adsorbent: firstly, 1g of vinylated MXene nanosheet and 1-vinyl-3-butylimidazolium bromide are added into 80mL of methanol according to the mass ratio of 1: 2. Stirring for 4 hours at room temperature, adding azobisisobutyronitrile into the solution according to the mass ratio of 2:3 of the azobisisobutyronitrile to the vinylated MXene nanosheet, adding 2mL of ethylene glycol dimethacrylate, purging the reaction bottle with argon for 10 minutes, and stirring for reaction for 48 hours at 60 ℃. The product is subjected to Soxhlet extraction by using a mixed solution of methanol and acetic acid for 48h, and then is subjected to vacuum drying at 60 ℃ for 24h to obtain the PILs-MXene adsorbent.
(4) 10mg of PILs-MXene adsorbent, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L are stirred at the temperature of 25 ℃ and the rpm of 200 for 4h, after filtration, the concentration of 2,4,6-TCP in the filtrate after adsorption is measured by a high performance liquid chromatograph, the concentration of 2,4,6-TCP is 1.6mg/L, and the removal rate of 2,4, 6-trichlorophenol is calculated to be 92%.
Example 5
(1) Preparation of MXene nanosheet: firstly, 30ml of HF aqueous solution with the mass concentration of 40 percent is added into a reaction bottle, and 6g of Ti is weighed 3 AlC 2 The powder is slowly added into a reaction bottle and stirred for 30min, and then the reaction is carried out for 24h at the temperature of 40 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 30min, and oscillating for 72h by a shaking table. Finally, the glue solution is frozen and dried to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into 100ml of toluene according to the mass ratio of 1:1, reacting for 48 hours at 70 ℃, and washing the product for 3 times by using ethanol and deionized water in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) Preparing a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet adsorbent: firstly, 1g of vinylated MXene nanosheet and 1-vinyl-3-butylimidazolium bromide are added to 90mL of methanol in a mass ratio of 1: 2. Stirring at room temperature for 4 hours, adding azobisisobutyronitrile into the solution according to the mass ratio of 1:3 of azobisisobutyronitrile to vinylated MXene nanosheets, adding 4mL of ethylene glycol dimethacrylate, purging the reaction flask with argon for 10 minutes, and stirring at 60 ℃ for reaction for 48 hours. The product is subjected to Soxhlet extraction for 48h by using a mixed solution of methanol and acetic acid, and is dried for 24h in vacuum at the temperature of 60 ℃ to obtain the PILs-MXene adsorbent.
(4) 10mg of PILs-MXene adsorbent, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L, was stirred at 25 ℃ for 4h at 200rpm, and after filtration, the concentration of 2,4,6-TCP in the filtrate after adsorption was measured by a high performance liquid chromatograph, and the concentration of 2,4,6-TCP was 3.2mg/L, and the removal rate of 2,4, 6-trichlorophenol was calculated to be 84%.
Example 6
(1) Preparation of MXene nanosheets: firstly, 50ml of HF aqueous solution with the mass concentration of 40% is added into a reaction bottle, and 5g of Ti is weighed 3 AlC 2 The powder is slowly added into a reaction bottle and stirred for 30min, and then the reaction is carried out for 24h at the temperature of 80 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 30min, and oscillating for 48h by a shaking table. Finally, the glue solution is frozen and dried to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into 80ml of toluene according to the mass ratio of 0.5:1, reacting for 24h at 60 ℃, and washing the product with ethanol and deionized water for 3 times in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) Preparing a poly (1-vinyl-3-butylimidazolium bromide) modified MXene nanosheet adsorbent: firstly, 1g of vinylated MXene nanosheet and 1-vinyl-3-butylimidazolium bromide are added into 70mL of methanol according to the mass ratio of 1: 2. Stirring at room temperature for 4 hours, adding azobisisobutyronitrile into the solution according to the mass ratio of 2:3 of the azobisisobutyronitrile to the vinylated MXene nanosheet, adding 1mL of ethylene glycol dimethacrylate, purging the reaction bottle with argon for 10 minutes, and stirring at 60 ℃ for 24 hours for reaction. The product is subjected to Soxhlet extraction for 48h by using a mixed solution of methanol and acetic acid, and is dried for 24h in vacuum at the temperature of 60 ℃ to obtain the PILs-MXene adsorbent.
(4) 10mg of PILs-MXene adsorbent, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L, was stirred at 25 ℃ for 4h at 200rpm, and after filtration, the concentration of 2,4,6-TCP in the filtrate after adsorption was measured by a high performance liquid chromatograph, and the concentration of 2,4,6-TCP was 5.6mg/L, and the removal rate of 2,4, 6-trichlorophenol was calculated to be 72%.
Comparative example 1
(1) Preparation of MXene nanosheets: firstly, 50ml of HF aqueous solution with the mass concentration of 40% is added into a reaction bottle, and 5g of Ti is weighed 3 AlC 2 The powder is slowly added into a reaction bottle and stirred for 30min, and then the reaction is carried out for 24h at the temperature of 80 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 30min, and oscillating for 48h by a shaking table. Finally, the glue solution is frozen and dried to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Taking 10mg of Ti 3 C 2 T x MXene nanosheet, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L, stirring for 4h at 25 ℃ and 200rpm, filtering, measuring the concentration of 2,4,6-TCP in the filtrate after adsorption by using a high performance liquid chromatograph, wherein the concentration of 2,4,6-TCP is 19mg/L, and calculating to obtain the removal rate of 2,4, 6-trichlorophenol to be 5%.
Comparative example 2
(1) Preparation of MXene nanosheets: firstly, 50ml of HF aqueous solution with the mass concentration of 40% is added into a reaction bottle, and 3g of Ti is weighed 3 AlC 2 The powder is slowly added into a reaction bottle and stirred for 30min, and then the reaction is carried out for 24h at the temperature of 40 ℃. And (3) centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 30min, and oscillating for 72h by a shaking table. Most preferablyThen, the glue solution is freeze-dried to obtain Ti 3 C 2 T x MXene nano-sheet.
(2) Preparation of vinylated MXene nanosheet: mixing Ti 3 C 2 T x Adding the nanosheet and vinyltriethoxysilane into 80ml of toluene according to the mass ratio of 1:1, reacting for 48 hours at 70 ℃, and washing the product for 3 times by using ethanol and deionized water in sequence. And finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
(3) 10mg of vinyl MXene nanosheet, 10ml of 2,4,6-TCP aqueous solution with the concentration of 20mg/L are taken, stirred at 25 ℃ for 4h at 200rpm, filtered, and then the concentration of 2,4,6-TCP in the filtrate after adsorption is measured by a high performance liquid chromatograph, the concentration of 2,4,6-TCP is 17.3mg/L, and the removal rate of 2,4, 6-trichlorophenol is calculated to be 13.5%.
Claims (9)
1. A preparation method of a polyion liquid modified MXene adsorbent is characterized by comprising the following steps: adding a vinylated MXene nanosheet and 1-vinyl-3-butylimidazole bromide salt into methanol at room temperature according to the mass ratio of 1: 1-1: 3, stirring, adding azobisisobutyronitrile into the solution according to the mass ratio of 1: 1-2: 3 of azobisisobutyronitrile to the vinylated MXene nanosheet, adding ethylene glycol dimethacrylate, purging with argon, stirring and reacting at 60 ℃ for 24-48 h, extracting and drying the product to obtain the polyion liquid modified MXene adsorbent, wherein the MXene nanosheet is Ti 3 C 2 T x Nanosheets.
2. The method of claim 1, wherein: the vinylated MXene nanosheet is prepared by the following method: mixing Ti 3 C 2 T x Adding the nanosheets and vinyltriethoxysilane into toluene according to the mass ratio of 0.5: 1-1: 3, wherein Ti is 3 C 2 T x The ratio of the nanosheets to toluene is 1g: 60-120 mL, the nanosheets and toluene react at 60-90 ℃ for 24-48 h, and the product is washed with ethanol and deionized water for 3 times in sequence; and finally, drying the product in vacuum to obtain the vinylated MXene nanosheet.
3. According toThe method of claim 1 or 2, wherein: the MXene nanosheet is prepared by the following method: first, Ti is added 3 AlC 2 Slowly adding the powder into a reaction bottle filled with HF aqueous solution with the mass concentration of 40 percent, wherein Ti 3 AlC 2 The powder and HF aqueous solution are in a ratio of 1g to 30-100 mL, and react for 24-72 h at 30-50 ℃; centrifugally washing the product with deionized water for 6-8 times, then carrying out ultrasonic stripping for 10-30 min, and oscillating for 48-72 h by a shaking table; finally, freeze-drying the glue solution to obtain Ti 3 C 2 T x MXene nano-sheet.
4. The method of claim 1, wherein: the ratio of the vinylated MXene nanosheet to methanol is 1g: 40-100 mL.
5. The method of claim 1, wherein: the ratio of the vinylated MXene nanosheet to the ethylene glycol dimethacrylate is 1g: 1-4 mL.
6. The method of claim 1, wherein: stirring for 4 hours at room temperature, adding azobisisobutyronitrile into the solution according to the mass ratio of the azobisisobutyronitrile to the vinylated MXene of 1: 1-2: 3, adding ethylene glycol dimethacrylate, purging the reaction bottle with argon for 10 minutes, and stirring and reacting for 24-48 hours at 60 ℃; and performing Soxhlet extraction on the product by using a mixed solution of methanol and acetic acid for 48 hours, and performing vacuum drying at 60 ℃ for 24 hours to obtain the polyion liquid modified MXene adsorbent.
7. The MXene adsorbent modified by the polyion liquid prepared by the method of any one of claims 1-6.
8. A method for adsorbing chlorophenol compounds, characterized by: contacting the polyionic liquid modified MXene adsorbent of claim 7 with a liquid containing chlorophenol compound and stirring for a period of time at room temperature.
9. The method of claim 8, wherein: the chlorophenol compound is 2,4, 6-trichlorophenol.
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