CN109351347A - It is a kind of using acrylamide as the preparation method and application of the hexavalent chromium trace composite membrane of function monomer - Google Patents
It is a kind of using acrylamide as the preparation method and application of the hexavalent chromium trace composite membrane of function monomer Download PDFInfo
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- CN109351347A CN109351347A CN201811138597.0A CN201811138597A CN109351347A CN 109351347 A CN109351347 A CN 109351347A CN 201811138597 A CN201811138597 A CN 201811138597A CN 109351347 A CN109351347 A CN 109351347A
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- hexavalent chromium
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- 239000012528 membrane Substances 0.000 title claims abstract description 76
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 45
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000000178 monomer Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000011259 mixed solution Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003960 organic solvent Substances 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 17
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 claims abstract description 15
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical compound FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 12
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000003999 initiator Substances 0.000 claims abstract description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 30
- 239000011651 chromium Substances 0.000 claims description 24
- 150000002500 ions Chemical class 0.000 claims description 23
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 14
- 238000006116 polymerization reaction Methods 0.000 claims description 14
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 9
- 238000010828 elution Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920002292 Nylon 6 Polymers 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 claims description 2
- 150000002825 nitriles Chemical class 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 229910001430 chromium ion Inorganic materials 0.000 claims 1
- LRDFRRGEGBBSRN-UHFFFAOYSA-N isobutyronitrile Chemical compound CC(C)C#N LRDFRRGEGBBSRN-UHFFFAOYSA-N 0.000 claims 1
- 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 abstract description 18
- 229910021645 metal ion Inorganic materials 0.000 abstract description 7
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 5
- 238000000227 grinding Methods 0.000 abstract description 2
- 238000007873 sieving Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 150000002148 esters Chemical class 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 230000009920 chelation Effects 0.000 description 3
- DGPGGSRBDAZGPP-UHFFFAOYSA-N ethane-1,2-diol;2-methylbut-2-ene Chemical group OCCO.CC=C(C)C DGPGGSRBDAZGPP-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229940093476 ethylene glycol Drugs 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- YYPNJNDODFVZLE-UHFFFAOYSA-N 3-methylbut-2-enoic acid Chemical compound CC(C)=CC(O)=O YYPNJNDODFVZLE-UHFFFAOYSA-N 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- UQXKXGWGFRWILX-UHFFFAOYSA-N ethylene glycol dinitrate Chemical compound O=N(=O)OCCON(=O)=O UQXKXGWGFRWILX-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 201000007270 liver cancer Diseases 0.000 description 1
- 208000014018 liver neoplasm Diseases 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
-
- 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
- B01J20/268—Polymers created by use of a template, e.g. molecularly imprinted polymers
-
- 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
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The present invention relates to a kind of using acrylamide as the preparation method and application of the hexavalent chromium trace composite membrane of function monomer, belongs to heavy metal ion adsorbed separation technology field.Using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer, use hexavalent chromium for template ion, acrylamide is function monomer, ethylene glycol dimethacrylate is crosslinking agent, azodiisobutyronitrile is initiator, it is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, hexavalent chromium trace composite membrane is prepared on support membrane by surface grafting method.The present invention is using existing commercial membranes as support membrane, hexavalent chromium trace composite membrane is prepared using metal ion engram technology, it is simple without complex operations, the preparation method such as grinding or sieving, strong environmental adaptability can be used for the adsorbing separation containing hexavalent chromium in Cr(VI) solution.
Description
Technical field
The present invention relates to a kind of using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer and
Using belonging to heavy metal ion adsorbed separation technology field.
Background technique
As the fast-developing chromium and compound of human economy is widely used in plating, medal polish, leather tanning, weaving
The industries such as product dyeing, cause serious pollution.In all valence states of chromium, trivalent chromium and Cr VI stable in nature can be deposited
Wherein a small amount of trivalent chromium is microelement necessary to life entity, and Cr VI is then carcinogen, the experiment proved that it is malicious
Property is more than 100 times of trivalent chromium, will lead to the major diseases such as lung cancer, liver cancer, therefore, the elimination of hexavalent chromium has in water body
Critically important meaning.Hexavalent chromium is different from other heavy metal ion, in water body according to environment it is different mainly with
Cr2O7 2-、HCrO4-、CrO4 2-The form of anion exists, and it is larger to remove difficulty for it compared with other heavy metal ion.
Currently, hexavalent chromium removing method mainly have membrane separation process, electrolysis method, chemical precipitation method, ion-exchange and
Absorption method etc., wherein absorption method is most common method, has many advantages, such as high efficiency, low cost and easy to operate, but conventional is inhaled
Attached method is unfavorable for the specific recognition of specific ion, can increase the difficulty that the later period separates again.In view of hexavalent chromium polluted severe shape
Gesture, finding a kind of effective hexavalent chromium processing method becomes and its important.Metal ion engram technology is a kind of improves specially
Using special metal ion as template organic small point of chelation can occur with metal ion for the method for one property recognition capability
Son is function monomer, forms a kind of imprinted material under the action of crosslinking agent and initiator, elution remove leave after template with
The identical hole of template molecule space size, so that specific recognition is carried out to special metal ion, in view of this feature metal
Ionic imprinting technique is widely used in the adsorbing separation field of heavy metal ion.
Summary of the invention
For the above-mentioned problems of the prior art and deficiency, the present invention provides a kind of using acrylamide as function monomer
The preparation method and application of hexavalent chromium trace composite membrane.The present invention utilizes metal ion using existing commercial membranes as support membrane
Engram technology prepares hexavalent chromium trace composite membrane, and without the complex operations such as grinding or sieving, preparation method is simple, and environment is suitable
Should be able to power it is strong, can be used for containing Cr(VI) adsorbing separation of hexavalent chromium in solution.
The present invention uses hexavalent chromium for template ion, and acrylamide is function monomer, ethyleneglycol dimethacrylate
Ester is crosslinking agent, and azodiisobutyronitrile is initiator, and commercially available commercial membranes are support membrane, with the mixed of You machine Rong Ji ∕ water (v:v=1:1)
Conjunction solution is porogenic solvents, and hexavalent chromium trace composite membrane is prepared on support membrane with surface grafting method.This method institute
Commercial membranes are stated under porogenic solvents, the nitrogenous small organic molecule of chelation can be generated with metal ion in its area load,
Under the action of crosslinking agent and initiator, ion blotting composite membrane is formed in film surface cross-linked polymeric, after elution removes template ion,
Film surface forms the hole for having specific recognition to template ion, to obtain having high adsorbing separation energy to hexavalent chromium
The trace composite membrane of power.
It is a kind of using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer, using Cr VI from
Son is template ion, and acrylamide is function monomer, and ethylene glycol dimethacrylate is crosslinking agent, and azodiisobutyronitrile is to draw
Agent is sent out, is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, through surface grafting method on support membrane
Hexavalent chromium trace composite membrane is prepared, the specific steps are as follows:
Step 1, by K2Cr2O7It is dissolved in the organic solvent and water mixed solution porogenic solvents that volume ratio is 1:1, adds propylene
Amide function monomer, isothermal vibration reacts 2~3 h at room temperature, and ethylene glycol dimethacrylate and two isobutyl of azo is added
Nitrile is dissolved and is shaken up, and forms pre-polymerization liquid；
Support membrane is placed in the pre-polymerization liquid in step 1 by step 2, is impregnated 3~60 min at normal temperature, is then heated to 60~80
12~24 h are reacted at DEG C, the methanol for being finally 9:1 with volume ratio and the elution of acetic acid mixed solution remove template ion, are prepared into
To hexavalent chromium trace composite membrane.
K in the step 12Cr2O7, acrylamide and ethylene glycol dimethacrylate molar ratio be 1:2~8:10~
50。
Organic solvent is methanol, ethyl alcohol, acetonitrile, N-N- dimethylformamide or isopropanol in the step 1.
Support membrane is polytetrafluoroethylene (PTFE) miillpore filter, polyvinylidene fluoride microporous filtering film and Nylon-6 micropore in the step 2
Filter membrane.Above-mentioned support membrane is commercially available commercial membranes.
A kind of hexavalent chromium trace composite membrane applies the adsorbing separation of hexavalent chromium in the solution.
The beneficial effects of the present invention are:
(1) the method for the present invention is used based on the principle for having preferable chelation between hexavalent chromium and nitrogenous small organic molecule
Commercially available commercial membranes are support membrane, overcome the disadvantages of existing hexavalent chromium imprinted polymer preparation is difficult, and method is cumbersome.
(2) trace composite membrane prepared by can hexavalent chromium effectively in adsorbent solution, imprinting effect is good.
(3) the trace composite membrane has many advantages, such as that stability is good using acrylamide as function monomer, and preparation method is simple,
It can be used for the adsorbing separation containing hexavalent chromium in Cr (VI) solution.
Specific embodiment
With reference to embodiment, the invention will be further described.
This is using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer, using hexavalent chromium
For template ion, acrylamide is function monomer, and ethylene glycol dimethacrylate is crosslinking agent, and azodiisobutyronitrile is to cause
Agent is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, is made on support membrane by surface grafting method
It is standby to obtain hexavalent chromium trace composite membrane, the specific steps are as follows:
Step 1, by 0.1mmolK2Cr2O7It is dissolved in the organic solvent (methanol) and water mixed solution pore of 10mL, volume ratio for 1:1
In solvent, acrylamide function monomer is added, isothermal vibration reacts 2 h at room temperature, and ethyleneglycol dimethacrylate is added
Ester and azodiisobutyronitrile are dissolved and are shaken up, and form pre-polymerization liquid；Wherein K2Cr2O7, acrylamide and ethylene glycol dimethyl propylene
Acid esters molar ratio is 1:2:10；K2Cr2O7It is 1:0.6 with azodiisobutyronitrile molar ratio；
Support membrane (polytetrafluoroethylene (PTFE) miillpore filter) is placed in the pre-polymerization liquid in step 1 by step 2, impregnates 3min at normal temperature, so
After be warming up at 60 DEG C and react 12 h, the methanol for being finally 9:1 with 150 mL, volume ratio and the elution of acetic acid mixed solution remove mould
Hexavalent chromium trace composite membrane is prepared in plate ion.
The 1.95g hexavalent chromium trace composite membrane that the present embodiment is prepared is applied and is in hexavalent chromium concentration
In 0.24 mmol/L solution, adsorbance is 41.31 μm of ol/g, imprinting factor 1.16.
Embodiment 2
This uses hexavalent chromium for mould using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer
Plate ion, acrylamide are function monomer, and ethylene glycol dimethacrylate is crosslinking agent, and azodiisobutyronitrile is initiator,
It is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, is prepared on support membrane by surface grafting method
Obtain hexavalent chromium trace composite membrane, the specific steps are as follows:
Step 1, by 0.1mmo K2Cr2O7It is dissolved in 10 mL, the organic solvent (ethyl alcohol) that volume ratio is 1:1 and water mixed solution cause
In the solvent of hole, acrylamide function monomer is added, isothermal vibration reacts 3 h at room temperature, and ethylene glycol dimethyl propylene is added
Acid esters and azodiisobutyronitrile are dissolved and are shaken up, and form pre-polymerization liquid；Wherein K2Cr2O7, acrylamide and ethylene glycol dimethyl third
Olefin(e) acid ester molar ratio is 1:4:20；K2Cr2O7It is 1:0.8 with azodiisobutyronitrile molar ratio；
Support membrane (polyvinylidene fluoride microporous filtering film) is placed in the pre-polymerization liquid in step 1 by step 2, impregnates 3 min at normal temperature,
It then heats at 60 DEG C and reacts 24 h, the methanol for being finally 9:1 with 150 mL, volume ratio and the elution of acetic acid mixed solution remove
Hexavalent chromium trace composite membrane is prepared in template ion.
The 1.91g hexavalent chromium trace composite membrane that the present embodiment is prepared is applied and is in hexavalent chromium concentration
In 0.24 mmol/L solution, adsorbance is 25.65 μm of ol/g, imprinting factor 1.10.
Embodiment 3
This uses hexavalent chromium for mould using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer
Plate ion, acrylamide are function monomer, and ethylene glycol dimethacrylate is crosslinking agent, and azodiisobutyronitrile is initiator,
It is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, is prepared on support membrane by surface grafting method
Obtain hexavalent chromium trace composite membrane, the specific steps are as follows:
Step 1, by 0.1mmolK2Cr2O7It is dissolved in 10 mL, the organic solvent (acetonitrile) that volume ratio is 1:1 and water mixed solution cause
In the solvent of hole, acrylamide function monomer is added, isothermal vibration reacts 3h at room temperature, and ethyleneglycol dimethacrylate is added
Ester and azodiisobutyronitrile are dissolved and are shaken up, and form pre-polymerization liquid；Wherein K2Cr2O7, acrylamide and ethylene glycol dimethyl propylene
Acid esters molar ratio is 1:4:30；K2Cr2O7It is 1:1 with azodiisobutyronitrile molar ratio；
Support membrane (Nylon-6 miillpore filter) is placed in the pre-polymerization liquid in step 1 by step 2, impregnates 3min at normal temperature, then
It is warming up at 60 DEG C and reacts 24 h, the methanol for being finally 9:1 with 150 mL, volume ratio and the elution of acetic acid mixed solution remove template
Hexavalent chromium trace composite membrane is prepared in ion.
The 1.95g hexavalent chromium trace composite membrane that the present embodiment is prepared is applied and is in hexavalent chromium concentration
In 0.24 mmol/L solution, adsorbance is 25.65 μm of ol/g, imprinting factor 1.10.
Embodiment 4
This uses hexavalent chromium for mould using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer
Plate ion, acrylamide are function monomer, and ethylene glycol dimethacrylate is crosslinking agent, and azodiisobutyronitrile is initiator,
It is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, is prepared on support membrane by surface grafting method
Obtain hexavalent chromium trace composite membrane, the specific steps are as follows:
Step 1, by 0.1mmol K2Cr2O7Be dissolved in 10 mL, volume ratio be 1:1 organic solvent (N-N- dimethylformamide) and
In water mixed solution porogenic solvents, acrylamide function monomer is added, isothermal vibration reacts 3 h at room temperature, and second two is added
Alcohol dimethylacrylate and azodiisobutyronitrile are dissolved and are shaken up, and form pre-polymerization liquid；Wherein K2Cr2O7, acrylamide and second
Diol dimethacrylate molar ratio is 1:6:40；K2Cr2O7It is 1:1.2 with azodiisobutyronitrile molar ratio；
Support membrane (Nylon-6 miillpore filter) is placed in the pre-polymerization liquid in step 1 by step 2, impregnates 60 min at normal temperature, so
After be warming up at 80 DEG C and react 36 h, the methanol for being finally 9:1 with 150 mL, volume ratio and the elution of acetic acid mixed solution remove
Hexavalent chromium trace composite membrane is prepared in template ion.
The 1.92g hexavalent chromium trace composite membrane that the present embodiment is prepared is applied and is in hexavalent chromium concentration
In 0.24 mmol/L solution, adsorbance is 45.37 μm of ol/g, imprinting factor 1.33.
Embodiment 5
This uses hexavalent chromium for mould using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer
Plate ion, acrylamide are function monomer, and ethylene glycol dimethacrylate is crosslinking agent, and azodiisobutyronitrile is initiator,
It is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, is prepared on support membrane by surface grafting method
Obtain hexavalent chromium trace composite membrane, the specific steps are as follows:
Step 1, by 0.1mmol K2Cr2O7It is dissolved in 10 mL, the organic solvent (isopropanol) and water mixed solution that volume ratio is 1:1
In porogenic solvents, acrylamide function monomer is added, isothermal vibration reacts 2.5 h at room temperature, and ethylene glycol dimethyl is added
Acrylate and azodiisobutyronitrile are dissolved and are shaken up, and form pre-polymerization liquid；Wherein K2Cr2O7, acrylamide and glycol dinitrate
Base acrylate molar ratio is 1:8:50；K2Cr2O7It is 1:1.2 with azodiisobutyronitrile molar ratio；
Support membrane (Nylon-6 miillpore filter) is placed in the pre-polymerization liquid in step 1 by step 2, impregnates 30 min at normal temperature, so
After be warming up at 70 DEG C and react 24 h, the methanol for being finally 9:1 with 150 mL, volume ratio and the elution of acetic acid mixed solution remove
Hexavalent chromium trace composite membrane is prepared in template ion.
The 1.95g hexavalent chromium trace composite membrane that the present embodiment is prepared is applied and is in hexavalent chromium concentration
In 0.24 mmol/L solution, adsorbance is 43.73 μm of ol/g, imprinting factor 1.33.
Above the embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment party
Formula can also be made without departing from the purpose of the present invention within the knowledge of a person skilled in the art
Various change out.
Claims (5)
1. a kind of using acrylamide as the preparation method of the hexavalent chromium trace composite membrane of function monomer, it is characterised in that: adopt
It is template ion with hexavalent chromium, acrylamide is function monomer, and ethylene glycol dimethacrylate is crosslinking agent, azo two
Isobutyronitrile is initiator, is the organic solvent of 1:1 and the mixed solution of water as porogenic solvents using volume ratio, passes through surface grafting method
Hexavalent chromium trace composite membrane is prepared on support membrane, the specific steps are as follows:
Step 1, by K2Cr2O7It is dissolved in the organic solvent and water mixed solution porogenic solvents that volume ratio is 1:1, adds propylene
Amide function monomer, isothermal vibration reacts 2~3 h at room temperature, and ethylene glycol dimethacrylate and two isobutyl of azo is added
Nitrile is dissolved and is shaken up, and forms pre-polymerization liquid；
Support membrane is placed in the pre-polymerization liquid in step 1 by step 2, is impregnated 3~60 min at normal temperature, is then heated to 60~80
12~36 h are reacted at DEG C, the methanol for being finally 9:1 with volume ratio and the elution of acetic acid mixed solution remove template ion, are prepared into
To hexavalent chromium trace composite membrane.
2. according to claim 1 using acrylamide as the preparation side of the hexavalent chromium trace composite membrane of function monomer
Method, it is characterised in that: K in the step 12Cr2O7, acrylamide and ethylene glycol dimethacrylate molar ratio be 1:2~8:
10~50.
3. according to claim 1 using acrylamide as the preparation side of the hexavalent chromium trace composite membrane of function monomer
Method, it is characterised in that: organic solvent is methanol, ethyl alcohol, acetonitrile, N-N- dimethylformamide or isopropanol in the step 1.
4. according to claim 1 using acrylamide as the preparation side of the hexavalent chromium trace composite membrane of function monomer
Method, it is characterised in that: in the step 2 support membrane be polytetrafluoroethylene (PTFE) miillpore filter, polyvinylidene fluoride microporous filtering film and
Nylon-6 miillpore filter.
5. a kind of hexavalent chromium trace composite membrane according to any one of claims 1 to 4 is using sexavalence in the solution
The adsorbing separation of chromium ion.
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| CN109438619A (en) * | 2018-09-28 | 2019-03-08 | 昆明理工大学 | It is a kind of using α-methacrylic acid as the preparation method and application of the hexavalent chromium trace composite membrane of function monomer |
| CN110339731A (en) * | 2019-07-02 | 2019-10-18 | 昆明理工大学 | A kind of preparation method and applications of chromium (VI) ion blotting composite membrane |
| CN115212855A (en) * | 2022-07-04 | 2022-10-21 | 广东食品药品职业学院 | Molecularly imprinted membrane and preparation method and application thereof |
| CN116084048A (en) * | 2022-12-30 | 2023-05-09 | 重庆科技学院 | Preparation method of chromium ion selective separation imprinting nanofiber based on electrostatic spinning |
| CN116084048B (en) * | 2022-12-30 | 2024-07-02 | 重庆科技学院 | Preparation method of chromium ion selective separation imprinting nanofiber based on electrostatic spinning |
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| CN109438619A (en) * | 2018-09-28 | 2019-03-08 | 昆明理工大学 | It is a kind of using α-methacrylic acid as the preparation method and application of the hexavalent chromium trace composite membrane of function monomer |
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| CN116084048A (en) * | 2022-12-30 | 2023-05-09 | 重庆科技学院 | Preparation method of chromium ion selective separation imprinting nanofiber based on electrostatic spinning |
| CN116084048B (en) * | 2022-12-30 | 2024-07-02 | 重庆科技学院 | Preparation method of chromium ion selective separation imprinting nanofiber based on electrostatic spinning |
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