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Metal ion imprinting polymer, preparation method and applications thereof

A metal ion imprinting, metal ion technology, applied in chemical instruments and methods, other chemical processes, separation by moving adsorbents, etc., can solve the problems of easy introduction of errors, easy interface emulsification, time-consuming analysis process, etc. Mild, short development cycle, good stability

Inactive Publication Date: 2015-11-25
BEIJING PURKINJE GENERAL INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the traditional method is the chelation-solvent extraction method, that is, the liquid-liquid extraction separation method. This method has obvious defects in actual operation, such as the need for a large amount of ultra-pure solvent, easy interface emulsification, etc., and the whole analysis process is time-consuming, laborious, and easy. introduce error
Solid phase extraction is an enrichment technology that people pay close attention to. Its core is an excellent extraction adsorbent that can achieve better separation and enrichment effects. Traditional adsorption materials such as activated carbon and modified silica gel separate and enrich metal ions in dilute solutions. , has low metal binding capacity and selectivity, while the swelling of ion exchange resins and slow transmission of metal ions limit further development

Method used

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  • Metal ion imprinting polymer, preparation method and applications thereof
  • Metal ion imprinting polymer, preparation method and applications thereof
  • Metal ion imprinting polymer, preparation method and applications thereof

Examples

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preparation example Construction

[0027] The preparation method of the metal ion imprinted polymer of the present invention comprises the following steps: mixing the functional monomer organosilane coupling agent, crosslinking agent, surfactant, and metal ion template in an appropriate amount of solvent, and then under alkaline conditions ( The pH value is about 13) to carry out polycondensation reaction to obtain a polymer containing metal ions; extract the above polymer in ethanol until the surfactant is completely extracted; clean the extracted polymer until no heavy metal ions are detected; The polymer from which the imprinted ions are removed is washed with an organic solvent to neutrality and dried under vacuum to obtain the metal ion imprinted polymer.

[0028] The metal ion-imprinted polymer of the present invention can be used to separate and enrich metal ions in environmental samples or food samples. The specific method is: the metal ion-imprinted polymer of the present invention is packed into a colu...

Embodiment 1

[0032] Example 1 Preparation of Cadmium Ion Imprinted Polymer

[0033] In a 250mL flask, add 0.73gCTMAB, 18.7g ultrapure water, stir to dissolve, then add 2.23mLTEOS, continue stirring for 30 minutes; take another flask, add 0.556gAAPTS, 0.274gCdCl 2 2.5H 2 O, 2ml of methanol, after stirring for 1 hour, add this solution to the previous flask and mix, add 1molL -1 NaOH 5ml, reacted for 2 days under stirring, then reacted for 1 day at 70°C, filtered with suction, dried the product in vacuum at 70°C for 12 hours, then extracted it with absolute ethanol for 24 hours, and then dried it in vacuum at 70°C for 12 hours. Afterwards, transfer the material to a 50ml centrifuge tube, add an appropriate amount of 4mol / L hydrochloric acid solution, shake and centrifuge repeatedly until no Cd ions are detected in the supernatant, and dry the obtained material in vacuum at 70°C for 12 hours to obtain cadmium ions Imprinted material, its scanning electron microscope picture is shown in fig...

Embodiment 2

[0034] Example 2 Preparation of lead ion imprinted polymer

[0035] In a 250mL flask, add 1.46gMSDS, 18.7g ultrapure water, stir to dissolve, then add 2.46mLTMOS, continue stirring for 30 minutes; take another flask, add 0.556gMPS, 0.379gPb(Ac) 2 ·3H 2 O, 2ml of methanol, after stirring for 1 hour, add this solution to the previous flask and mix, add 1molL -1 NaOH 5ml, reacted for 2 days under stirring, then reacted for 1 day at 80°C, filtered with suction, dried the product in vacuum at 70°C for 12 hours, then extracted it with absolute ethanol for 24 hours, and then dried it in vacuum at 70°C for 12 hours. Afterwards, transfer the material to a 50ml centrifuge tube, add an appropriate amount of 4mol / L nitric acid solution, shake and centrifuge repeatedly, until no Pb ions are detected in the supernatant, and vacuum dry the obtained material at 80°C for 12 hours to obtain lead ions Imprinted material, its scanning electron microscope picture is shown in image 3 , Figure...

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Abstract

The present invention discloses a metal ion imprinting polymer preparation method, which comprises that a silane coupling agent, a cross-linking agent, a surfactant, a solvent and a metal ion template are used to prepare the metal ion imprinting polymer through a sol-gel method. The present invention further provides a metal ion imprinting polymer prepared through the method, and applications of the metal ion imprinting polymer. According to the present invention, the metal ion imprinting polymer can well meet the requirements on the metal-specific adsorption, and the adsorbents have characteristics of high temperature resistance, acid resistance, alkali resistance and short development cycle, and can selectively extract the trace target from the complex system.

Description

technical field [0001] The invention relates to a metal ion imprinted polymer, in particular to a metal ion imprinted polymer that can be used to separate and enrich metal ions in environmental samples or food samples and a preparation method thereof. Background technique [0002] Heavy metal pollution of agricultural products due to industrial "three wastes" pollution, heavy metals such as mercury, lead, cadmium, nickel, copper, arsenic, etc., they are quite common in agricultural product pollution, such as in field crops, the main heavy metal pollutants of agricultural products are lead, cadmium, Copper and mercury are the most prominent. Heavy metal pollution is different from other organic pollution. Heavy metals are enriched and difficult to degrade in the environment. For example, heavy metals discharged with wastewater, even if the content is very low, will accumulate in algae and sediment, be absorbed by fish and shellfish, produce food chain concentration, and caus...

Claims

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Application Information

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IPC IPC(8): C08G77/26C08G77/20C08G77/28C08G77/14C08G79/00C08J9/26B01J20/26B01J20/30B01D15/02
Inventor 康澍郑清林王利平王倩卢瑞华
Owner BEIJING PURKINJE GENERAL INSTR
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