Fluorescent polymer, Fe 3+ detection test paper and preparation method and application thereof

Abstract

The invention discloses a fluorescent polymer and a preparation method thereof. Trifluoromethyl is introduced into the fluorescent polymer, so that the light and heat stability of the polymer can be improved; the technology is beneficial to improvement of fluorescence response in the aspect of metal ion detection, so that the fluorescent probe has relatively good fluorescence-metal ion responsiveness and can be used for fluorescence detection of metal ions, and meanwhile, the polymer has good dissolvability and is convenient to process and apply. The synthesized fluorescent polymer is prepared into a solution, the metal Fe 3+ detection test paper is prepared through an impregnation method, the test paper has fluorescence enhanced responsiveness to metal Fe 3+ and further has the advantages of being portable, high in sensitivity, simple in detection operation and the like, so that the metal Fe 3+ can be rapidly, simply and conveniently detected by dripping the solution to be detected on the test paper.

Description

technical field

[0001] The invention belongs to the field of fluorescence detection, and more specifically relates to a fluorescent polymer, Fe 3+ Detection test paper and its preparation method and application. Background technique

[0002] Iron itself is not toxic, but it can cause iron poisoning when ingested in excess or ingested in excess. Excessive iron will damage the basic components of cells, such as fatty acids, proteins, nucleic acids, etc., leading to imbalances in other trace elements, especially calcium and magnesium requirements. Too much iron in drinking water can cause symptoms such as loss of appetite, vomiting, diarrhea, gastrointestinal disorders, and abnormal bowel movements. In daily life, iron ions can leave yellow spots on white fabrics or water utensils and sanitary utensils. At the same time, it is easy to cause iron bacteria to multiply and block pipes. Therefore, the detection of iron ions in water is necessary.

[0003] For the detection of i...

Examples

Embodiment 1

[0042] A kind of fluorescent polymer, its structural formula is as follows:

[0043] Among them, n=60-120.

[0044] The synthetic route of above-mentioned fluorescent polymer is as follows:

[0045]

[0046] The preparation method of above-mentioned fluorescent polymer is as follows:

[0047] In a three-necked flask, add 5 mmol of diamine monomer and 5 mmol of hexafluorophthalic anhydride monomer, add 48 mL of cresol as solvent, 0.1503 g of isoquinoline as catalyst, stir magnetically at room temperature for 30 minutes, and then adjust the temperature of the reaction solution to 190 °C, the reaction was continued for 12 hours. After the reaction was completed, the reaction liquid was poured into 250 mL of absolute ethanol, and the reaction was completed by settling, further filtered and washed. Finally, the polymer was vacuum-dried at 120° C. for 10 hours to obtain the target polymer. figure 1 and figure 2 It is the NMR spectrum of the target polymer. It can be seen ...

Embodiment 2

[0049] a kind of Fe 3+ Detect the preparation of test paper, the preparation process is as follows:

[0050] Weigh 1.041 g of the fluorescent polymer described in Example 1 and mix it with 10 mL of N,N-dimethylacetamide, shake until the polymer is fully dissolved, and prepare a 10 wt % fluorescent polymer solution. After immersing the filter paper in the polymer solution for 5 minutes, take it out and fix it on the support frame, and dry it at 80°C for 2 hours to obtain metal Fe 3+ Test strips.

[0051] Such as image 3 As shown, the prepared test paper has a smooth surface and a large number of pores, which are formed by the volatilization of the solvent during the drying process. These pores can allow the liquid to be tested to fully penetrate into the test paper, which is conducive to the adsorption of metal ions in the liquid.

Embodiment 3

[0053] Metal Fe 3+ The application of the detection test paper, the test process is as follows:

[0054] Prepare 5×10 -6 mol / L containing Fe 3+ Drop the solution on the detection test paper, wait for 60s, and compare it with the blank test paper under ultraviolet light irradiation.

[0055] Such as Figure 4 As shown, the detection test paper is adsorbing Fe 3+ The previous fluorescence emission spectrum shows the maximum fluorescence emission peak at 603nm, and the adsorption of Fe 3+ Afterwards, the maximum emission peak of the fluorescence red shifted to 630nm, and the test paper was absorbing Fe 3+ After the fluorescence intensity increased, compared with the ordinary filter paper under ultraviolet light and the test paper before and after adsorption, the detection test paper showed yellow fluorescence, and the adsorption of Fe 3+ After the test paper has obvious fluorescence enhancement phenomenon, it shows that the detection test paper prepared by the present inven...

technical field

[0001] The invention belongs to the field of fluorescence detection, and more specifically relates to a fluorescent polymer, Fe 3+ Detection test paper and its preparation method and application. Background technique

[0002] Iron itself is not toxic, but it can cause iron poisoning when ingested in excess or ingested in excess. Excessive iron will damage the basic components of cells, such as fatty acids, proteins, nucleic acids, etc., leading to imbalances in other trace elements, especially calcium and magnesium requirements. Too much iron in drinking water can cause symptoms such as loss of appetite, vomiting, diarrhea, gastrointestinal disorders, and abnormal bowel movements. In daily life, iron ions can leave yellow spots on white fabrics or water utensils and sanitary utensils. At the same time, it is easy to cause iron bacteria to multiply and block pipes. Therefore, the detection of iron ions in water is necessary.

[0003] For the detection of i...

Examples

Embodiment 1

[0042] A kind of fluorescent polymer, its structural formula is as follows:

[0043] Among them, n=60-120.

[0044] The synthetic route of above-mentioned fluorescent polymer is as follows:

[0045]

[0046] The preparation method of above-mentioned fluorescent polymer is as follows:

[0047] In a three-necked flask, add 5 mmol of diamine monomer and 5 mmol of hexafluorophthalic anhydride monomer, add 48 mL of cresol as solvent, 0.1503 g of isoquinoline as catalyst, stir magnetically at room temperature for 30 minutes, and then adjust the temperature of the reaction solution to 190 °C, the reaction was continued for 12 hours. After the reaction was completed, the reaction liquid was poured into 250 mL of absolute ethanol, and the reaction was completed by settling, further filtered and washed. Finally, the polymer was vacuum-dried at 120° C. for 10 hours to obtain the target polymer. figure 1 and figure 2 It is the NMR spectrum of the target polymer. It can be seen ...

Embodiment 2

[0049] a kind of Fe 3+ Detect the preparation of test paper, the preparation process is as follows:

[0050] Weigh 1.041 g of the fluorescent polymer described in Example 1 and mix it with 10 mL of N,N-dimethylacetamide, shake until the polymer is fully dissolved, and prepare a 10 wt % fluorescent polymer solution. After immersing the filter paper in the polymer solution for 5 minutes, take it out and fix it on the support frame, and dry it at 80°C for 2 hours to obtain metal Fe 3+ Test strips.

[0051] Such as image 3 As shown, the prepared test paper has a smooth surface and a large number of pores, which are formed by the volatilization of the solvent during the drying process. These pores can allow the liquid to be tested to fully penetrate into the test paper, which is conducive to the adsorption of metal ions in the liquid.

Embodiment 3

[0053] Metal Fe 3+ The application of the detection test paper, the test process is as follows:

[0054] Prepare 5×10 -6 mol / L containing Fe 3+ Drop the solution on the detection test paper, wait for 60s, and compare it with the blank test paper under ultraviolet light irradiation.

[0055] Such as Figure 4 As shown, the detection test paper is adsorbing Fe 3+ The previous fluorescence emission spectrum shows the maximum fluorescence emission peak at 603nm, and the adsorption of Fe 3+ Afterwards, the maximum emission peak of the fluorescence red shifted to 630nm, and the test paper was absorbing Fe 3+ After the fluorescence intensity increased, compared with the ordinary filter paper under ultraviolet light and the test paper before and after adsorption, the detection test paper showed yellow fluorescence, and the adsorption of Fe 3+ After the test paper has obvious fluorescence enhancement phenomenon, it shows that the detection test paper prepared by the present inven...

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