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Lead ion and cadmium ion double-template magnetic molecularly imprinted polymer and preparation method thereof

A magnetic molecular imprinting and dual-template technology, which is applied to alkali metal compounds, chemical instruments and methods, and other chemical processes, can solve the problems of easy existence of certain risks, low adsorption and enrichment efficiency, and small adsorption capacity, and achieve cycle Take advantage of good performance, low cost, and fast separations

Active Publication Date: 2019-10-22
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing magnetic cadmium ion imprinted polymers only selectively adsorb cadmium ions, and have the disadvantages of small adsorption capacity and low adsorption and enrichment efficiency, while lead and cadmium, two heavy metals in the water environment, soil or agricultural products Pollutants often exist at the same time; moreover, the prior art generally uses methacrylic acid, salicylaldoxime, acrylamide, and vinylpyridine as functional monomers. These chemicals have certain toxicity to the human body and are easy to detect in food samples. there is a certain risk

Method used

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  • Lead ion and cadmium ion double-template magnetic molecularly imprinted polymer and preparation method thereof
  • Lead ion and cadmium ion double-template magnetic molecularly imprinted polymer and preparation method thereof
  • Lead ion and cadmium ion double-template magnetic molecularly imprinted polymer and preparation method thereof

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Experimental program
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Embodiment 1

[0027] A preparation method for a lead-cadmium ion dual-template magnetic molecularly imprinted polymer, comprising the following steps:

[0028] (1) Fe 3 o 4 @mSiO 2 preparation of

[0029] in N 2 Under protection, 5.838g FeCl 3 ·6H 2 O and 3.003g FeSO 4 ·7H 2 Add 100ml of distilled water to O to dissolve, heat to 80°C, add 13mL of concentrated ammonia water dropwise while stirring mechanically, stir at 80°C for 30 minutes, add 1g of sodium pyrophosphate, heat the solution to 90°C, continue to stir for 1.5h, magnetically separate, wash with distilled water , placed in a vacuum dryer at 50°C for 6 hours to obtain magnetic nano-Fe 3 o 4 ; Take cetyltrimethylammonium bromide (CTAB) 0.5g, 0.01mol L -1 Put 50mL of NaOH and 50mL of deionized water in a 250mL flask, sonicate for 15min, add the prepared magnetic nano-Fe 3 o 4 0.7g, under the condition of 80℃ water bath, stir mechanically for 10min, slowly add 10mLTEOS ethanol solution dropwise, react for 2h, wash with eth...

Embodiment 2

[0033] Air-dry or dry the soil, rice, and rice husk samples, crush them, and pass through a 200-mesh sieve; accurately weigh 0.2500g in the digestion tube, add 10mL of nitric acid, and carry out microwave digestion. Digest at 250°C for 20 minutes, then lower the temperature to room temperature, rinse with acid, and after cooling, dilute to 50 mL with pH=6.0 buffer solution for magnetic solid-phase extraction and graphite furnace atomic absorption spectrophotometer measurement.

[0034]Add 30 mg of lead-cadmium ion dual-template magnetically imprinted molecular polymer to an 80 mL beaker, add 5.0 mL of methanol, activate by ultrasonication for 5 minutes, magnetically separate, wash twice, rinse twice with 10.0 mL of deionized water, and then add the treated sample solution , shake at room temperature for 30min, magnetically separate, and decant; the adsorbent is washed twice with 5.0mL methanol, and finally washed with 3.0mL0.6mol·L -1 HCl was ultrasonically washed for 10 min, ...

experiment example 1

[0040] Accurately weigh 30mg of lead-cadmium ion dual-template magnetic molecularly imprinted polymer (DMIIP) into 10mL containing Pb 2+ 、Cd 2+ 、Cu 2+ , Mg 2+ , Zn 2+ And the concentration is 1.0mg·mL -1 In the solution (pH=6), shake and adsorb at 25°C for 1h, separate the adsorbent with a magnet, take the supernatant, and measure the Pb in the solution with a graphite furnace atomic absorption spectrophotometer 2+ 、Cd 2+ 、Cu 2+ , Mg 2+ , Zn 2+ The concentration of the magnetic non-molecularly imprinted polymer (DMNIP) was prepared as a control except that Pb(NO 3 ) 2 , Cd(NO 3 ) 2 Except for the template molecule, the remaining steps are the same as the preparation method of DMIIP.

[0041] Calculate the distribution coefficient K according to the formula d , selection coefficient k and imprinting factor α.

[0042] K d =Q bm / c 0

[0043] k=K d (Pb 2+ 、Cd 2+ 、Cu 2+ , Mg 2+ , Zn 2+ ) / K d (Mg 2+ )

[0044] α=k DMIIP / k DMNIP

[0045] Q bm Dual-te...

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Abstract

The invention provides a lead ion and cadmium ion double-template magnetic molecularly imprinted polymer and a preparation method thereof. The magnetic molecularly imprinted polymer is prepared by using Pb<2+> and Cd<2+> as double templates, papain as a functional monomer and carbodiimide as a dehydrating agent and a coupling agent. The magnetic molecularly imprinted polymer can simultaneously adsorb two heavy metal ions Pb<2+> and Cd<2+> at a high adsorption amount and a high selectivity, has a wide application range, and has broad application prospects in fast magnetic separation, enrichmentand analysis of Pb<2+> and Cd<2+> in biological samples, environmental samples, foods and agricultural products.

Description

technical field [0001] The invention relates to the field of heavy metal ion enrichment, in particular to a lead-cadmium ion double-template magnetic molecular imprinted polymer and a preparation method thereof. Background technique [0002] Cadmium and lead are heavy metal elements with serious pollution and strong toxicity. In the natural environment, even very low concentrations can cause serious harm to humans. Excessive intake of lead will inhibit the development of the brain and lead to chronic nephritis; lead-contaminated food will be enriched to the human body through the food chain, thereby causing harm to the human body. -1 lead poisoning will occur; and cadmium is carcinogenic. In addition, the accumulation of cadmium in the human body will lead to renal damage and impairment of calcium and phosphorus regulation, resulting in bone decalcification, osteomalacia, and pathological fractures; therefore, It is of great significance to monitor the content of lead and c...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30
CPCB01J20/268B01J20/28009
Inventor 韦寿莲谢春生陈丹
Owner ZHAOQING UNIV
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