A kind of network ion imprinted polymer, its preparation method and application

An ion imprinting and polymer technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve problems such as poor water solubility, single active group, poor template ion selective recognition ability, etc., and achieve simple preparation , low cost, good water phase compatibility

Active Publication Date: 2018-11-30
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a network ion-imprinted polymer that selectively recognizes lead ions and a preparation method thereof, the purpose of which is to firstly prepare 8-hydroxyquinoline through the Mancini reaction The grafted gelatin polypeptide, with the help of the excellent performance of the gelatin polypeptide as a functional monomer, and then through physical film formation-re-swelling-chemical cross-linking, a network-like ion-imprinted polymer is prepared, thereby solving the problem of ion-imprinted polymerization in the prior art The technical problems of organic monomer active groups are single, poor water solubility, and poor selective recognition ability to template ions

Method used

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  • A kind of network ion imprinted polymer, its preparation method and application
  • A kind of network ion imprinted polymer, its preparation method and application
  • A kind of network ion imprinted polymer, its preparation method and application

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preparation example Construction

[0036] A network ion imprinted polymer provided by the invention, its preparation method comprises the following steps:

[0037] (1) Preparation of 8-hydroxyquinoline grafted gelatin polypeptide

[0038] 1.1) Dissolve analytically pure gelatin made from pigskin in 0.01-0.1 mol / L sodium hydroxide solution until the gelatin is completely dissolved, wherein the gelatin concentration is 10-50 mg / mL, preferably 30 mg / mL , reacting at 70-100°C for 0.5-4 hours, hydrolyzing the gelatin protein into a small-molecule polypeptide mixture, and then adjusting the pH value of the solution to 7.0 with hydrochloric acid of the same concentration as sodium hydroxide to obtain an aqueous gelatin polypeptide solution;

[0039] 1.2) Dissolving 8-hydroxyquinoline in an ethanol solution, and then adding the gelatin polypeptide aqueous solution prepared in 1.1), wherein the mass ratio of gelatin to 8-hydroxyquinoline is 1 to 5:1, preferably 2.1:1, and the ultrasonic dispersion is uniform to obtain ...

Embodiment 1

[0049] (1) Preparation of 8-hydroxyquinoline grafted gelatin polypeptide

[0050] The analytically pure gelatin processed from pigskin was dissolved in 25mL of sodium hydroxide solution (0.1mol / L), the gelatin concentration was 30mg / mL, reacted at 80°C for 2 hours to obtain the gelatin polypeptide, and then used Isoconcentrated hydrochloric acid adjusted the pH of the solution to 7.0. Dissolve 350mg of 8-hydroxyquinoline in 25mL of ethanol solution, then add it to the above-mentioned gelatin polypeptide solution, and disperse evenly by ultrasonic; then, after adding 0.25mL of acetic acid and 0.5mL of formaldehyde to the mixed solution, pour it into a round bottom connected with a condenser tube In the flask, react at 100°C for 6 hours to obtain a white precipitate; wash with ethanol and aqueous solution repeatedly to remove unreacted reagents;

[0051] (2) Preparation of network-like ion-imprinted polymers

[0052] Disperse a certain amount of lead acetate (20mg), chitosan (...

Embodiment 2

[0056] (1) Preparation of 8-hydroxyquinoline grafted gelatin polypeptide

[0057] 150 mg of analytically pure gelatin processed from pigskin was dissolved in 15 mL of sodium hydroxide solution (0.01 mol / L), the gelatin concentration was 10 mg / mL, and reacted at 70 ° C for 0.5 hours to obtain gelatin polypeptides, and then The pH of the solution was adjusted to 7.0 with isocratic hydrochloric acid. Dissolve 150mg of 8-hydroxyquinoline in 25mL of ethanol solution, then add the above gelatin polypeptide aqueous solution, and disperse evenly by ultrasonic; then, after adding 0.04mL of acetic acid and 0.8mL of formaldehyde to the mixed solution, pour it into a round bottom flask connected with a condenser tube In the reaction at 80°C for 4 hours, a white precipitate was obtained; washed repeatedly with ethanol and aqueous solution to remove unreacted reagents;

[0058] (2) Preparation of network-like ion-imprinted polymers

[0059] Disperse a certain amount of lead acetate (20mg)...

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Abstract

The invention discloses a reticular ion imprinting polymer for selectively identifying lead ions, and a preparation method and an applicationthereof, and belongs to the field of new materials. The reticular ion imprinting polymer is characterized in that 8-hydroxyquinoline-grafted gelatinpolypeptidewhich is used as a function monomeris synthesized by Mannich reaction, and the advantages of richer activity groups, good shrinkage / swelling property, good filming property and the like are realized; on the basis, a preparation technique for preparing the ion imprinting polymer by a physical filming-secondary swelling-chemical crosslinking three-step preparation type is proposed; by controlling the size of a dish used during swelling, the self torsion / folding of a film material is performed in a particular slit space, so as to obtain various shapes of imprinting polymers; finally, after double crosslinking of genipin / transglutaminase, the reticular lead ion imprinting polymer thin film is formed. Since the function monomer contains multiple types of activity groups, the double-crosslinking system and the particular reticular structure, theion imprinting polymerhas the quick adsorption dynamics, high adsorption capacity and selective identifying function on the lead ions.

Description

technical field [0001] The invention belongs to the field of new materials, and more specifically relates to a network ion imprinted polymer, its preparation method and application. Background technique [0002] In recent years, heavy metal pollution incidents have emerged in an endless stream in my country, mainly due to the random discharge and leakage of heavy metals. During the five years from 2006 to 2010, there were nearly 20 major lead pollution accidents in China. In 2009, when accidents were high, there were 178 recorded lead pollution accidents. The accumulation of lead in the body can impair kidney function and damage the nervous system. For developing children, lead poisoning is more likely to cause mental decline and abnormal behavior. In fact, there is no safe dose for blood lead levels. Although WHO considers that blood lead concentration lower than 100 μg / dL can be regarded as a normal value, a large number of literatures show that even though blood lead c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H1/00C08J3/24C08J7/02C08J5/18B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/268C02F1/285C02F2101/20C08H1/00C08J3/243C08J5/18C08J7/02C08J2389/00
Inventor 荆涛黄凯李兵兵周峰
Owner HUAZHONG UNIV OF SCI & TECH
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