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Method for preparation of lead ion imprinted polymer microspheres by use of bi-functional monomer synergistic effect

An imprinted polymer, bifunctional monomer technology, applied in the fields of materials science and engineering and environmental science, can solve the problems of single monomer and poor selectivity, and achieve the effects of simple operation, fast adsorption rate and good reproducibility

Inactive Publication Date: 2015-07-01
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the existing monomers for preparing ion-imprinted polymers are single and can form complexes with various ions, the preparation of IIPs still faces the great challenge of poor selectivity.

Method used

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  • Method for preparation of lead ion imprinted polymer microspheres by use of bi-functional monomer synergistic effect
  • Method for preparation of lead ion imprinted polymer microspheres by use of bi-functional monomer synergistic effect
  • Method for preparation of lead ion imprinted polymer microspheres by use of bi-functional monomer synergistic effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve the template ion lead ion and the functional monomer in a molar ratio of 1:4, that is, 2.5mmol and 10mmol, into a mixed solution of 30mL of hydroxyethylcellulose (1wt.%) aqueous solution and 15mL of toluene, and mix the solution Stir at a constant speed for 3 h at room temperature, and then add a crosslinking agent and an initiator. The functional monomers are methacrylic acid (5mmol) and tetravinylpyridine (5mmol), the crosslinking agent is ethylene glycol dimethacrylate (20mmol), and the initiator is azobisisobutyronitrile (40mg). After the mixture was sealed, it was ultrasonically treated with nitrogen in an ice bath, and then polymerized by heating and stirring to form a white powdery polymer. The mixture was first reacted in a water bath at 50°C for 6 hours, and then reacted at 60°C for 8 hours. Wash the synthesized white powdery polymer with a mixed solution of acetone and water at a volume ratio of 1:1 to remove surfactants and crosslinking agents, and t...

Embodiment 2

[0031] According to the operating procedures for preparing S-IIPs in Example 1, only a single functional monomer was used to prepare the lead ion imprinted polymer, wherein the functional monomers were respectively 10 mmol of methacrylic acid or 10 mmol of tetravinylpyridine, that is, to obtain Suspension-polymerized lead ion-imprinted polymer with acrylic acid as functional monomer or suspension-polymerized lead ion-imprinted polymer with tetravinylpyridine as functional monomer.

[0032] Take 20 mg of the bifunctional monomer suspension polymerization IIPs prepared in the above-mentioned Example 1 and the corresponding NIPs and bifunctional monomer bulk polymerization IIPs, suspension polymerization IIPs with methacrylic acid as the functional monomer, and tetravinylpyridine as the functional monomer. Suspension polymerized IIPs (compared to the polymer of the present invention and the above two single functions? Answer: Yes), dispersed in 5mL of different concentrations (0, ...

Embodiment 3

[0034] Take 20 mg of bifunctional monomer suspension polymerized imprinted polymers (S-IIPs) and bifunctional monomer bulk polymerized imprinted polymers (B-IIPs) and disperse them in 5 mL of lead ion solution with a concentration of 60 ppm, and the pH of the lead ion solution 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 6.5 and 7.0 respectively. Then the mixture was centrifuged at 7000r / min. Get the supernatant and measure the concentration of remaining lead ions with an atomic absorption spectrometer. According to the formula Q=(C 0 -C) m / V to obtain the adsorption capacity Q, so as to obtain the influence curve of pH on the adsorption performance of the imprinted polymer. It was found that S-IIPs and B-IIPs had the same trend, but the adsorption capacity of S-IIPs was higher than that of B-IIPs; in the acidic range, the adsorption capacity gradually increased with the increase of pH, and when the pH reached neutral, The adsorption capacity reaches a maximum. Finally, the solution with...

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Abstract

The invention belongs to the field of material science and engineering and environmental science, and particularly relates to a method for preparation of a lead ion imprinted polymer microspheres by use of bi-functional monomer synergistic effect. A lead ion is used as an imprinting ion (a template ion) of a polymer, methyl acrylic acid and 4-vinyl pyridine are used as functional monomers, and imprinted microspheres with uniform particle size can be prepared by suspension polymerization. The prepared imprinted microspheres have high lead ion adsorption capacity, good dynamic characteristics, high recognition selectivity and high repetition utilization. The microspheres achieve high selective enrichment of lead ions in natural water samples by combination of solid phase extraction. The method breaks through the traditional use of single functional monomers, and a new method for the preparation of an imprinted polymer by use of bi-functional monomers or multi-functional monomers is provided, and the method has the advantages of simple and rapid operation, low cost and good reproducibility, and has wide application prospect.

Description

technical field [0001] The invention belongs to the fields of material science and engineering and environmental science, and specifically relates to a method for preparing lead ion imprinted polymer microspheres through synergistic action of bifunctional monomers. Background technique [0002] Lead is one of the main heavy metal pollutants with important environmental, health and ecotoxicological significance. It can cause human anemia, nervous dysfunction and kidney damage, and has carcinogenic, teratogenic and mutagenic effects on the human body. Moreover, the toxicity of lead to the human body is cumulative, and lead-contaminated aquatic products and crops can be enriched through the food chain and cause harm to the human body. Therefore, the separation and enrichment of trace lead in water is an indispensable link in the treatment of lead-containing wastewater and the analysis of lead-containing samples. [0003] Molecular imprinting technology is a new type of affini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/14C08F220/06C08F226/06C08F2/20C08J9/26B01J20/26C02F1/28C02F1/62
Inventor 李金花陈令新蔡晓强张忠
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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