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Preparation method and application of lead ion imprinted material

A technology of imprinted materials and lead ions, which is applied in the field of preparation of lead ion imprinted materials, can solve the problems of unsatisfactory results, matrix interference, low lead, etc., and achieve the effect of avoiding the damage of recognition sites and uniform particle size

Inactive Publication Date: 2019-04-26
BEIJING PURKINJE GENERAL INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the relatively low content of lead in environmental samples and the serious interference of the matrix, even high-sensitivity detection instruments such as atomic absorption (AAS) or inductively coupled plasma emission spectroscopy (ICP-AES) cannot be used for direct measurement. Effect

Method used

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  • Preparation method and application of lead ion imprinted material
  • Preparation method and application of lead ion imprinted material
  • Preparation method and application of lead ion imprinted material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of lead ion imprinted polymer

[0023] (1) Mix 1 mmol of lead acetate and 1-6 mmol of surfactant micelles with 1 mol of high-purity water, and stir at room temperature for 1 h;

[0024] (2) In the solution of step (1), add 1 to 6 mmol of functional monomer, and stir at room temperature for 1 hour to form a lead ion complex; the functional monomer is 3-mercaptopropyltrimethoxysilane;

[0025] (3) Dissolve 10-20mmol tetraethyl orthosilicate in 2-10ml methanol, mix with the solution in step (2), add 2-5mL sodium hydroxide solution, and stir magnetically at room temperature for 24-48h , and then reacted in a water bath at 90°C for 24 hours to form a polymer;

[0026] (4) The polymer formed in the step (3) is carried out in ethanol solution for 24h, and then washed repeatedly with 2mol / L nitric acid solution, until no lead ion is detected in the eluent, and finally washed with high-purity water until Neutral, oven dry.

[0027] The lead ion-imprinted polymer p...

Embodiment 2

[0029] Adsorption Capacity of Lead Ion Imprinted Polymer

[0030] Accurately weigh multiple portions of 100 mg of lead ion-imprinted polymers into a 15 mL centrifuge tube, add 10 mL of lead ion solutions (100-600 μg / ml) with different concentrations, shake for 0.5 h, centrifuge, and use an atomic absorption spectrometer to measure the concentration of the supernatant. concentration of lead ions in the solution. Such as figure 1 As shown, the results show that the adsorption capacity of the lead ion-imprinted polymer is 55.64 μg / mg, which has good adsorption performance.

Embodiment 3

[0032] Selective Adsorption Assay of Lead Ion Imprinted Polymers

[0033] Accurately weigh 100 mg of the lead ion-imprinted polymer prepared in the example in a 15 mL centrifuge tube, add 10 mL of a solution containing lead ions and competing ions (such as cadmium ions, mercury ions), shake for 0.5 h, centrifuge, and detect the adsorption of the supernatant After the concentration of lead ions in the solution, add 10ml of 2M nitric acid solution to the precipitate, shake for 0.5h, centrifuge, and take the supernatant to detect the concentration of lead ions in the solution after elution.

[0034] Table 1 shows the competitive adsorption results of lead ion-imprinted polymers for different concentrations of cadmium(II) and mercury(II). It can be seen that the adsorption rate of the lead ion-imprinted polymer to template lead ions is much higher than that of other ions, reflecting the effect of imprinting.

[0035] Table 1 Selective adsorption test of lead ion imprinted polymer...

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Abstract

The invention provides a preparation method and an application of a lead ion imprinted material. The preparation method comprises steps as follows: step one, 1 mmol of lead acetate and 1-6 mmol of surfactant micelle are mixed with 1 mol of high-purity water, and all materials are stirred for 1 h at the room temperature; step two, 1-6 mmol of functional monomers are added to a mixed solution obtained in step one, stirring is performed for 1 h at the room temperature, and a lead ion complex is formed; the functional monomers are 3-mercaptopropyl trimethoxysilane; step three, 10-20 mmol of tetraethyl orthosilicate is dissolved in 2-10 ml of methanol, after a mixed solution is mixed with the complex in step two, 2-5 mL of a sodium hydroxide solution is added, magnetic stirring is performed for24-48 h at the room temperature, a mixture is subjected to a water-bath reaction at the temperature of 90 DEG C for 24 h, and a polymer is formed; step four, the polymer formed in step three is subjected to Soxhlet extraction for 24 h in an ethanol solution and repeatedly washed by a nitric acid solution with concentration being 2 mol / L until no lead ions are detected from an eluate, and finally,the polymer is washed by the high-purity water to be neutral and dried in a drying box. The prepared lead ion imprinted material has specific selectivity on lead ions with the molecular imprinting technique.

Description

technical field [0001] The invention relates to a preparation method of a lead ion imprinted material and its application, and belongs to the technical field of the preparation method of a lead ion imprinted material and its application. Background technique [0002] Lead is a heavy metal that is seriously harmful to the human body. It easily enters the human body through water and food, and accumulates to cause lead poisoning, which has obvious damage to the nervous system, kidneys, and hematopoietic system. Therefore, the World Health Organization and various countries have repeatedly revised the limit standards for lead pollutants in samples such as food and the environment. However, the detection of trace lead in the environment has always been an important research topic due to the serious interference of the matrix in the actual sample detection. However, due to the relatively low content of lead in environmental samples and the serious interference of the matrix, eve...

Claims

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Application Information

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IPC IPC(8): C08G77/28C08J9/26B01J20/26B01J20/30
CPCB01J20/268C08G77/28C08J9/26
Inventor 康澍王倩兰天
Owner BEIJING PURKINJE GENERAL INSTR
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