CN113024799B - Application of soluble polymer with micropores in iodine vapor detection - Google Patents
Application of soluble polymer with micropores in iodine vapor detection Download PDFInfo
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- 239000011630 iodine Substances 0.000 title claims abstract description 69
- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 69
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229920000642 polymer Polymers 0.000 title claims abstract description 55
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 230000000171 quenching effect Effects 0.000 claims abstract description 22
- 238000010791 quenching Methods 0.000 claims abstract description 20
- 238000002189 fluorescence spectrum Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 27
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 15
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 12
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 10
- PCRSJGWFEMHHEW-UHFFFAOYSA-N 2,3,5,6-tetrafluorobenzene-1,4-dicarbonitrile Chemical compound FC1=C(F)C(C#N)=C(F)C(F)=C1C#N PCRSJGWFEMHHEW-UHFFFAOYSA-N 0.000 claims description 9
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 9
- 150000003983 crown ethers Chemical class 0.000 claims description 6
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
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- 101001001642 Xenopus laevis Serine/threonine-protein kinase pim-3 Proteins 0.000 abstract description 44
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 description 39
- 230000000694 effects Effects 0.000 description 5
- 239000013316 polymer of intrinsic microporosity Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
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- 238000010521 absorption reaction Methods 0.000 description 3
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- 150000002496 iodine Chemical class 0.000 description 3
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 235000019698 starch Nutrition 0.000 description 3
- 239000008107 starch Substances 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 229920005597 polymer membrane Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
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- POFMQEVZKZVAPQ-UHFFFAOYSA-N 1,1,1',1'-tetramethyl-3,3'-spirobi[2h-indene]-5,5',6,6'-tetrol Chemical compound C12=CC(O)=C(O)C=C2C(C)(C)CC11C2=CC(O)=C(O)C=C2C(C)(C)C1 POFMQEVZKZVAPQ-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
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- 238000000295 emission spectrum Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000695 excitation spectrum Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001917 fluorescence detection Methods 0.000 description 1
- 238000001506 fluorescence spectroscopy Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000007210 heterogeneous catalysis Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- -1 iodine ions Chemical class 0.000 description 1
- 238000010983 kinetics study Methods 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002096 quantum dot Substances 0.000 description 1
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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Abstract
The invention relates to an application of a soluble polymer with micropores in iodine vapor detection, which comprises the following steps: adopting fluorescence spectrum scanning to emit fluorescence from the polymer with micropores; then placing the polymer with micropores and the iodine-containing object to be detected in the same system, adsorbing iodine by the polymer with micropores, and then carrying out fluorescence quenching on the polymer with micropores by adopting fluorescence spectrum scanning. Application of the invention, 10‑6mol/m3The quenching degree of the iodine steam with large and small concentration to PIM-1 fluorescence can reach about one order of magnitude, the detection limit is low, the sensitivity is high, the repeatability to iodine steam fluorescence induction is good, the utilization rate is high, the interference to iodine steam fluorescence quenching effect environment is small, and the method is suitable for water vapor and other environments.
Description
Technical Field
The invention relates to application of a soluble polymer with micropores in iodine steam detection, belonging to the technical field of iodine detection.
Background
With the rapid increase of energy demand, nuclear power has been receiving attention as a reliable energy source. However, it is always accompanied by the generation and release of nuclear waste, iodine radioisotopes (I-129 and I-131) are the main volatile substances in nuclear fuel reprocessing plants, are highly mobile gases, have high surface adhesion and can have negative effects on living bodies, and these iodine radioisotopes inhaled or ingested through the food chain tend to accumulate in the thyroid gland and emit harmful rays, seriously affecting the metabolic processes of the human body. Due to its highly volatile and readily diffusible nature, not only is it necessary to capture it immediately after its release, but also sensitive in-situ detection of radioactive iodine vapor is necessary.
At present, the detection of iodine steam mainly comprises (1) a chemical color development method, wherein the color development reaction of iodine and starch is utilized to verify the existence of iodine, but the starch is easy to deteriorate and can be dissolved and lost after being wetted, and in addition, the defects that the color development of different types of starch is inconsistent and difficult to quantify exist; (2) the electrochemical method detects the existence and concentration of iodine by using the oxidation-reduction reaction of iodine vapor on an electrode, and can only be used for detecting low-concentration dry iodine vapor due to the strong surface adsorbability and strong corrosivity of the iodine vapor; (3) the plasma chromatography-mass spectrometry (ICP-MS) detects the content of iodine according to the charge-to-mass ratio, and the method has high sensitivity and accuracy, but the instrument is expensive and is not suitable for wide application. Therefore, it is very important and urgent to develop other simple iodine vapor detection methods.
The fluorescence detection has the advantages of high sensitivity, good selectivity, wide linear range, small influence from the outside and the like. Effective detection of iodine content can be performed by using a fluorescence quenching mechanism caused by iodine, for example, research on detection of iodine ions based on a graphite-phase carbon nitride quantum dot direct fluorescence quenching method is reported in Spectroscopy and Spectral Analysis 2019,39, 2029-. However, the research of directly detecting the gas-phase elemental iodine by directly using fluorescence spectroscopy is not reported at present.
The soluble self-microporous Polymers (PIMs) are favored by researchers in the fields of gas separation, trace explosive vapor detection, organic matter removal, heterogeneous catalysis and the like because the soluble self-microporous Polymers (PIMs) have higher specific surface area, inherent microporous structure and good stability, particularly, part of the PIMs have good hydrophobicity and organic solvent solubility, and can be conveniently processed into shapes and devices such as films, fibers, coatings and the like according to requirements. For example, the document Sensors 2011,11, 2478-; the Journal of Colloid and Interface Science 2018,516, 317-324 document reports that aniline can be effectively removed from air by using a PIM-1 fiber membrane. Therefore, the PIMs combine the advantages of formability, high adsorption capacity, stability, strong fluorescence and the like, and the detection and adsorption of the elemental iodine vapor by using the PIMs are expected to generate new technology and new application.
Through retrieval, the application of detecting iodine vapor based on the soluble polymer with micropores is not reported at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the application of the soluble polymer with micropores in iodine steam detection, and the polymer has high autofluorescence intensity and high sensitivity to iodine steam detection.
The invention is realized by the following technical scheme:
the application of the soluble polymer with micropores in iodine vapor detection comprises the following steps:
(1) adopting fluorescence spectrum scanning to emit fluorescence from the polymer with micropores;
(2) then placing the polymer with micropores and the iodine-containing object to be detected in the same system, adsorbing iodine by the polymer with micropores, and then carrying out fluorescence quenching on the polymer with micropores by adopting fluorescence spectrum scanning.
According to the invention, in the step (1), the structural general formula of the polymer with micropores is shown as formula I:
wherein,
the structural general formula of the preferable self-micropore polymer is shown as the formula II
wherein-CN is cyano.
Preferably, in step (1), the polymer with micropores is polymer powder with micropores or polymer membrane with micropores.
According to the invention, in step (1), the polymer powder with micropores is prepared by the following method:
under inert atmosphere, adding tetrafluoroterephthalonitrile (TFTPN), 5',6,6' -tetrahydroxy-3, 3,3',3' -tetramethyl-1, 1' -spirobiindane (TTSBI) into Dimethylacetamide (DMAC), and then adding potassium carbonate, toluene and crown ether to obtain a mixture; and carrying out reflux reaction on the mixture at 160 ℃ to obtain a viscous solution, adding the viscous solution into methanol to obtain a yellow polymer, adding the yellow polymer into chloroform and methanol for purification, then carrying out reflux washing by deionized water, and carrying out vacuum drying to obtain self-micropore polymer powder.
Preparation of a polymer membrane with micropores: dissolving the polymer powder with micropores in chloroform, naturally volatilizing to form a membrane, soaking the membrane in methanol, and drying in vacuum to obtain the membrane-shaped polymer with micropores (PIM-1 membrane).
Further preferably, the molar ratio of tetrafluoroterephthalonitrile (TFTPN), 5',6,6' -tetrahydroxy-3, 3,3',3' -tetramethyl-1, 1' -spirobiindane (TTSBI), Dimethylacetamide (DMAC), potassium carbonate, toluene and crown ether is 1:1:19.3:3: 0.1: 0.05.
the drying of the potassium carbonate and the addition of the crown ether are beneficial to improving the molecular weight of the polymer with micropores, thereby being more beneficial to film formation.
According to the present invention, in step (1), the maximum fluorescence excitation wavelength of the polymer having micropores is 470 nm.
Preferably, in step (1), the maximum fluorescence emission wavelength of the fluorescence spectrum is 515nm, and the fluorescence intensity is 4.5X 105。
Preferably, in step (2), the maximum fluorescence emission wavelength and the fluorescence intensity of the fluorescence spectrum are the same as those in step (1).
According to a preferred embodiment of the invention, in step (2), the fluorescence quenching time is between 0.1 and 2 h.
The method can be used for detecting the content of iodine vapor in the step (2) of the invention to be 2.15 multiplied by 10-6mol/m3-2.47×10-2mol/m3。
After the PIM-1 membrane and iodine steam with different contents are mixed and reacted in a closed system, a fluorescence spectrum is measured by using a fluorescence spectrophotometer, the fluorescence intensity of the fluorescence spectrum is recorded, and the concentration of the iodine steam can be calculated according to a standard curve.
The invention has the technical characteristics and advantages that:
1. the application of the polymer with micropores in iodine steam detection provided by the invention has the advantages that the prepared membrane-shaped PIM-1 is convenient to operate, the fluorescence intensity of the polymer is high, and the observation is facilitated.
2. The application of the polymer with micropores in iodine steam detection can lead the fluorescence quenching degree of saturated iodine steam and a PIM-1 membrane to be about one order of magnitude only after being contacted for 5min, and the response time is fast.
3. Application of the polymer with micropores in iodine vapor detection of the invention, 10-6mol/m3The quenching degree of the iodine vapor with large and small concentration to PIM-1 fluorescence can reach about one order of magnitude, the detection limit is low, and the sensitivity is high.
4. The PIM-1 membrane has good repeatability and high utilization rate on iodine vapor fluorescence induction.
5. The PIM-1 membrane has small interference on iodine steam fluorescence quenching effect environment, and can be suitable for water vapor and other environments.
Drawings
FIG. 1 is a graph showing the maximum fluorescence excitation spectrum and the maximum emission spectrum of a PIM-1 membrane in example 1.
FIG. 2 is a graph showing the degree of quenching of fluorescence intensity of PIM-1 membrane by iodine vapor with time in the experimental examples.
FIG. 3 is a graph showing the effect of fluorescence under an ultraviolet lamp before and after exposure of a PIM-1 membrane to iodine vapor in an experimental example.
FIG. 4 is a fluorescence spectrum of a PIM-1 membrane mixed with iodine vapor of different concentrations in an experimental example.
FIG. 5 is a graph showing the intensity of the PIM-1 membrane at the maximum fluorescence emission wavelength after different manipulations in the experimental examples.
Detailed description of the preferred embodiments
The present invention will be further described with reference to the following detailed description of embodiments thereof, but not limited thereto, in conjunction with the accompanying drawings.
The raw materials used in the examples were all conventional commercially available products unless otherwise specified.
Example 1
The application of the soluble polymer with micropores in iodine steam detection comprises the following specific steps:
the first step is as follows: preparation of PIM-1 membranes
Tetrafluoroterephthalonitrile (2.001g, 0.01mol) and 5,5',6,6' -tetrahydroxy-3, 3,3',3' -tetramethylspirobiindane (3.404g, 0.01mol), anhydrous potassium carbonate (4.14g, 0.03mol), dimethylacetamide (20mL), toluene (10mL) and a small amount of crown ether were added to a 100mL three-necked flask equipped with a magnetic stirrer, argon inlet and a water separator. The mixture was then refluxed at 160 ℃ for 40min, yielding a viscous solution, which was poured into methanol to yield a yellow, flexible linear polymer. The polymer product was dissolved in chloroform and precipitated from methanol for further purification, and finally the resulting polymer was refluxed with deionized water for 6 hours and vacuum dried at 100 ℃ for 48 hours to give PIM-1 powder.
Dissolving the prepared PIM-1 powder in chloroform at a mass ratio of 2%, naturally volatilizing to form a film, then soaking the film in methanol for 12h, vacuum drying at 100 ℃ for 24h to obtain the PIM-1 film, and cutting into a size of 1 × 1cm for later use.
The second step is that: PIM-1 Membrane fluorescence intensity
The PIM-1 membrane was tested for fluorescence spectra using a fluorescence spectrophotometer, and its maximum excitation wavelength and maximum emission wavelength were determined by repeating the excitation-emission operation, and the maximum value of its fluorescence intensity was recorded.
From FIG. 1, it was confirmed that the PIM-1 membrane had a maximum fluorescence excitation wavelength of 470nm, a maximum fluorescence emission wavelength of 515nm and a fluorescence intensity of 4.5X 105。
The third step: use of PIM-1 membranes
Scanning the PIM-1 membrane by adopting a fluorescence spectrum to emit fluorescence; the PIM-1 membrane has a maximum fluorescence excitation wavelength of 470nm, a maximum fluorescence emission wavelength of 515nm, and a fluorescence intensity of 4.5 × 105；
And then the PIM-1 membrane and the iodine-containing object to be detected are placed in the same system, and after the iodine is adsorbed by the polymer with the micropores, fluorescence spectrum scanning is adopted to quench the polymer with the micropores.
Experimental example:
1. PIM-1 Membrane fluorescence quenching kinetics study
The PIM-1 membrane and excessive solid elemental iodine are placed in a closed system, the system is kept at 30 ℃, the PIM-1 membrane is taken out along with the reaction time of the system to carry out fluorescence spectrum scanning, the maximum value of the fluorescence intensity of the PIM-1 membrane at different time intervals is recorded, and the fluorescence quenching degree of iodine vapor on the PIM-1 membrane along with the time is researched.
As shown in FIG. 2, the PIM-1 fluorescence quenching degree by saturated iodine vapor can reach 1 order of magnitude after 5min, and the intensity is changed to 4.6 × 104After 1h, the quenching degree can reach 2 orders of magnitude, and the strength is changed to 4.6 multiplied by 103The quenching degree can reach 3 to 4 orders of magnitude after 2 hours, and the quenching effect is strongThe degree becomes around 100, and the extremely sensitive fluorescence response of the PIM-1 membrane to iodine vapor is seen. The fluorescence effect under an ultraviolet lamp before and after mixing the PIM-1 membrane with iodine vapor is shown in figure 3, and it can be seen that the fluorescence intensity of the PIM-1 membrane is obviously reduced after contacting with the iodine vapor, and the PIM-1 membrane can detect the iodine vapor through fluorescence sensing again.
2. Degree of quenching of PIM-1 membrane fluorescence by iodine vapor with different content
(1) Weighing quantitative solid elemental iodine, dissolving the solid elemental iodine in absorption liquid, diluting the solution into iodine solutions with different concentrations through volume, scanning the solution by using an ultraviolet-visible spectrophotometer, and selecting absorbance and concentration at the 231nm wavelength as a standard curve, wherein the specific numerical values are shown in table 1:
TABLE 1
The correlation of the obtained graticule equation is 0.0499x +0.0059(y represents absorbance intensity, and x represents iodine concentration) and is 0.9998.
(2) Placing excessive solid elementary iodine into a conical flask, placing and balancing at 30 ℃, purging by nitrogen at a fixed speed to bring out diluted iodine vapor, absorbing by an absorption liquid after stabilizing for a period of time, scanning by using an ultraviolet-visible spectrophotometer, calculating the concentration of the iodine vapor in the system according to a standard curve, and having the following operation schematic diagram:
(3) and (3) removing the absorption liquid in the step (2), introducing stable airflow into an empty bottle, blowing for half an hour, putting the bottle into a PIM-1 membrane, performing fluorescence spectrum scanning on the PIM-1 membrane by using a fluorescence spectrophotometer, and recording the maximum value of the fluorescence intensity of the PIM-1 membrane after the reaction with iodine steam with different content, wherein the test result is shown in a figure 4.
As can be seen in FIG. 4, 10-6mol/m3The quenching degree of iodine vapor with large and small concentration to PIM-1 fluorescence can reach about one order of magnitude, and the fluorescence intensity is controlled by4.5×105Becomes 6.4 × 104The method has great significance for iodine vapor detection and early warning in practical application.
3. Iodine-loaded PIM-1 Membrane regeneration Studies
The iodine-loaded PIM-1 membrane is soaked in absolute ethyl alcohol at room temperature for about 30min, circularly soaked for 3 times, and subjected to fluorescence test after being dried in vacuum at 100 ℃ for 24h, as shown in figure 5, the fluorescence intensity of the membrane can be basically recovered, and the regeneration effect is good. The phenomenon of quenching is still obvious when the regenerated PIM-1 membrane is used for next mixing with saturated iodine vapor. The effect can be repeated after the cycle is repeated for 5 times, which shows that the PIM-1 membrane has good repeatability on iodine vapor fluorescence induction.
Claims (6)
1. The application of the soluble polymer with micropores in iodine vapor detection comprises the following steps:
(1) adopting a fluorescence spectrum to scan the polymer with the micropores to emit fluorescence;
the structural general formula of the polymer with micropores is shown as formula II
Formula II
wherein-CN is cyano;
the polymer with micropores is polymer powder with micropores or a polymer film with micropores;
the self-contained microporous polymer powder is prepared by the following method:
under inert atmosphere, adding tetrafluoroterephthalonitrile (TFTPN), 5',6,6' -tetrahydroxy-3, 3,3',3' -tetramethyl-1, 1' -spirobiindane (TTSBI) into Dimethylacetamide (DMAC), and then adding potassium carbonate, toluene and crown ether to obtain a mixture; refluxing and reacting the mixture at 160 ℃ to obtain a viscous solution, adding the viscous solution into methanol to obtain a yellow polymer, adding the yellow polymer into chloroform and methanol for purification, then refluxing and washing with deionized water, and drying in vacuum to obtain self-micropore polymer powder;
the polymer film with micropores is prepared by the following method: dissolving polymer powder with micropores in chloroform, naturally volatilizing to form a film, soaking the film in methanol, and drying in vacuum to obtain a film-shaped polymer with micropores;
(2) then placing the polymer with micropores and the iodine-containing object to be detected in the same system, adsorbing iodine by the polymer with micropores, and then carrying out fluorescence quenching on the polymer with micropores by adopting fluorescence spectrum scanning.
2. Use according to claim 1, characterized in that the molar ratio of tetrafluoroterephthalonitrile (TFTPN), 5',6,6' -tetrahydroxy-3, 3,3',3' -tetramethyl-1, 1' -spirobiindane (TTSBI), Dimethylacetamide (DMAC), potassium carbonate, toluene and crown ether is 1:1:19.3:3: 0.1: 0.05.
3. the use according to claim 1, wherein in step (1), the maximum fluorescence excitation wavelength of the polymer with micropores is 470 nm.
4. The use according to claim 1, wherein in step (1), the maximum fluorescence emission wavelength of the fluorescence spectrum is 515nm, and the fluorescence intensity is 4.5X 105。
5. The use according to claim 1, wherein in step (2), the maximum fluorescence emission wavelength and the fluorescence intensity of the fluorescence spectrum are the same as those in step (1); in the step (2), the fluorescence quenching time is 0.1-2 h.
6. Use according to claim 1, wherein step (2) is carried out to detect the iodine vapor content as 2.15 x 10-6 mol/m3-2.47×10-2 mol/m3。
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