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Outdoor water source heavy metal detection polymer preparation and preparation method thereof

A heavy metal and polymer technology, applied in the field of heavy metal detection, can solve the problems of high raw material cost, limited application, difficult heavy metal ions, etc., and achieve the effect of increased fluorescence intensity, rich pore structure, and full adsorption

Active Publication Date: 2021-03-16
江西月池天然矿泉水有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent uses expensive rare earth europium complexes as fluorescent probes, and the cost of raw materials is relatively high; at the same time, since the hydrogel provided by this patent becomes liquid after adding water and stirring, it takes a long time to convert it into a gel state. Time-consuming heating and dehydration is inconvenient in practical applications; and the hydrogel is difficult to effectively remove the adsorbed heavy metal ions after the detection is completed, which affects the repeated use of the hydrogel and limits its application.

Method used

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  • Outdoor water source heavy metal detection polymer preparation and preparation method thereof
  • Outdoor water source heavy metal detection polymer preparation and preparation method thereof
  • Outdoor water source heavy metal detection polymer preparation and preparation method thereof

Examples

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preparation example Construction

[0031] The invention provides a method for preparing a polymer preparation for detecting heavy metals in outdoor water sources, comprising the following steps:

[0032] S1. Add a predetermined amount of borax and agar into the polyvinyl alcohol solution, heat and stir to obtain a first mixed solution; after the first mixed solution is cooled to room temperature, a composite hydrogel is obtained;

[0033] S2. After mixing 4-bromo-1,8-naphthalene dicarboxylic anhydride and piperazine according to a preset molar ratio, dissolve them in an organic solvent to perform a first reflux reaction to obtain a first reflux product; After mixing with ethanolamine according to the first preset mass ratio, dissolving in an organic solvent, adding a predetermined amount of triethylamine, and performing a second reflux reaction to obtain a carboxylated fluorescent product;

[0034]S3. Mix the composite hydrogel obtained in step S1 and the carboxylated fluorescent product obtained in step S2 acc...

Embodiment 1

[0046] This embodiment provides a method for preparing a polymer preparation for detecting heavy metals in outdoor water sources, including the following steps:

[0047] S1. Add polyvinyl alcohol into deionized water, stir fully at 90°C until the polyvinyl alcohol is completely dissolved, and obtain a polyvinyl alcohol solution with a mass fraction of 2%; then add a predetermined amount of borax and agar to the polyvinyl alcohol solution respectively In the process, the first mixed solution is obtained, and the mass ratio of polyvinyl alcohol, agar and borax in the mixed solution is 1:1:0.2; the mixed solution is continuously stirred, and after it is cooled to room temperature, a composite hydrogel is obtained.

[0048] S2. After mixing 4-bromo-1,8-naphthalene dicarboxylic anhydride and piperazine at a molar ratio of 1:1, dissolve in ethylene glycol monomethyl ether, reflux at 85°C for 6 hours, and then cool to room temperature. The product is subjected to suction filtration a...

Embodiment 2～3 and comparative example 1～2

[0057] Examples 2-3 and Comparative Examples 1-2 respectively provide a polymer preparation for detecting heavy metals in outdoor water sources. Compared with Example 1, the difference is that the amount of agar added in step S1 is changed. The mass ratios of polyvinyl alcohol and agar in Examples 2 to 3 were 1:0.8 and 1:1.2 respectively; in comparative example 1, no agar was added; in comparative example 2, the mass ratio of polyvinyl alcohol to agar was 2 :1. The remaining steps of Comparative Examples 1-2 are consistent with those of Example 1, and will not be repeated here.

[0058] In the same manner as in Example 1, the heavy metal detection polymer preparation prepared in Comparative Examples 1-2 was applied to the detection of mercury ion concentration, and its detection limit, coefficient of variation and relative deviation were tested and calculated. The results are shown in Table 1 shown.

[0059] Table 1 The detection situation of the heavy metal detection polyme...

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Abstract

The invention provides an outdoor water source heavy metal detection polymer preparation and a preparation method thereof. The preparation method comprises steps: introducing borax and agar with specific contents into polyvinyl alcohol to prepare a composite hydrogel; preparing a fluorescent product containing a naphthalimide fluorophore, and performing carboxylation on the fluorescent product toobtain a carboxylated fluorescent product; grafting the fluorophore onto the composite hydrogel by utilizing an esterification reaction between the composite hydrogel and the carboxylated fluorescentproduct to obtain an esterification product; carrying out hydroformylation on the esterification product, and introducing thiosemicarbazide to carry out a Schiff base reaction, so as to obtain the heavy metal detection polymer preparation containing the fluorophore and the thiourea group at the same time. Through the mode, the heavy metal detection polymer preparation prepared by the invention notonly can be used for efficiently, accurately and sensitively detecting heavy metal mercury ions in an outdoor water source, but also can be repeatedly used, so that the detection cost is effectivelyreduced, and the heavy metal detection polymer preparation has a relatively high application value.

Description

technical field [0001] The invention relates to the technical field of heavy metal detection, in particular to an outdoor water source heavy metal detection polymer preparation and a preparation method thereof. Background technique [0002] In recent years, the rapid development of industrialization has not only brought economic progress, but also aggravated environmental pollution. The discharge of a large amount of industrial wastewater and domestic sewage has caused outdoor water sources to be polluted by heavy metals. Because heavy metal ions are easy to migrate with water bodies, and are easily absorbed but difficult to degrade in organisms, they will gradually enrich along the food chain and enter the human body through aquatic products, endangering human health. Among all kinds of heavy metal ions, mercury ions are extremely harmful. Even a small amount of mercury ions will directly cause negative effects on the nervous system, kidneys, heart, brain, lungs and immune ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J3/075C08L29/04C08L5/12C08K3/38C09K11/06G01N21/64
CPCC08J3/075C08J7/12C08J2305/12C08J2329/04C08K2003/387C09K11/06C09K2211/1029G01N21/6428
Inventor 李桂云
Owner 江西月池天然矿泉水有限公司
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