Preparation method of melamine-modified porous magnetic dextran microspheres

A technology of melamine and dextran, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., to achieve the effect of good adsorption selection, large adsorption capacity and fast adsorption speed

Inactive Publication Date: 2016-12-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only has the advantages of good mechanical properties of inorganic materials, but also has all the advantages of organic materials. At present, there is no report on the preparation of adsorbents by melamine modified porous magnetic dextran microspheres.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Organic phase preparation: In the reactor, add salad oil: 70 mL, epichlorohydrin: 21 mL, sorbitan fatty acid ester: 10 mL, stir evenly, and form the organic phase;

[0026] (2) Water phase preparation: In the reactor, add deionized water: 60 mL, dextran: 30 g, nano-Fe 3 o 4 Magnetic particles: 6g, sodium hydroxide: 4g, ultrasonically dispersed, in water phase;

[0027] (3) Preparation of porous magnetic dextran microspheres: In the reactor, at room temperature, under stirring at a speed of 2000 rpm, spray the aqueous phase of step (2) into the organic phase of step (1) , stirred for 1 hour, the temperature rose to 80±2°C, continued to react for 3.5 hours, cooled to room temperature, separated solid and liquid, washed thoroughly with deionized water, placed in a plastic container and quickly frozen at -18°C, took it out and put it in the freezer In a drying oven, freeze-dry for 24 h to obtain porous magnetic dextran microspheres;

[0028] (4) Preparation of melami...

Embodiment 2

[0030] (1) Organic phase preparation: In the reactor, add salad oil: 65 mL, epichlorohydrin: 24 mL, sorbitan fatty acid ester: 12 mL, stir evenly, and form the organic phase;

[0031] (2) Water phase preparation: In the reactor, add deionized water: 64 mL, dextran: 28 g, nano-Fe 3 o 4 Magnetic particles: 5g, sodium hydroxide: 3g, ultrasonically dispersed, in water phase;

[0032](3) Preparation of porous magnetic dextran microspheres: In the reactor, at room temperature, under stirring at a speed of 2000 rpm, spray the aqueous phase of step (2) into the organic phase of step (1) , stirred for 1 hour, the temperature rose to 80±2°C, continued to react for 3 hours, cooled to room temperature, separated from solid and liquid, washed thoroughly with deionized water, placed in a plastic container and quickly frozen at -18°C, taken out and placed in freeze-dry In the box, freeze-dry for 24 hours to obtain porous magnetic dextran microspheres;

[0033] (4) Preparation of melamine-...

Embodiment 3

[0035] (1) Organic phase preparation: In the reactor, add salad oil: 76 mL, epichlorohydrin: 20 mL, sorbitan fatty acid ester: 6 mL, stir evenly, and form the organic phase;

[0036] (2) Water phase preparation: In the reactor, add deionized water: 56 mL, dextran: 32 g, nano-Fe 3 o 4 Magnetic particles: 7g, sodium hydroxide: 5g, ultrasonically dispersed, in water phase;

[0037] (3) Preparation of porous magnetic dextran microspheres: In the reactor, at room temperature, under stirring at a speed of 2000 rpm, spray the aqueous phase of step (2) into the organic phase of step (1) , stirred for 1 hour, the temperature rose to 80±2°C, continued to react for 4 hours, cooled to room temperature, separated from solid and liquid, washed thoroughly with deionized water, placed in a plastic container and quickly frozen at -18°C, taken out and put into freeze-drying In the box, freeze-dry for 24 hours to obtain porous magnetic dextran microspheres;

[0038] (4) Preparation of melamin...

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Abstract

The invention discloses a preparation method of melamine-modified porous magnetic dextran microspheres. The preparation method is characterized by comprising the following steps: by taking salad oil as an organic phase and dextran as an aqueous phase, spraying the aqueous phase into the organic phase at room temperature, stirring for carrying out a reaction for 1h, heating up to 80+/-2 DEG C, continuously reacting for 3-4h, cooling to the room temperature, carrying out solid-liquid separation, rapidly freezing, and carrying out freeze drying for 24h to obtain porous magnetic dextran microspheres; after that, adding 60-68% of methanol, 5-10% of epoxy chloropropane and 8-14% of melamine into a reactor according to composition mass percent concentration, dissolving, and then adding 14-22% of the porous magnetic dextran microspheres, wherein the percentage sum of all the components is 100%; maintaining the constant temperature of 50+/-2 DEG C, stirring, and carrying out a reflux reaction for 2-3h; cooling, then washing a product respectively with deionized water and methanol, carrying out solid-liquid separation, and drying to obtain the melamine-modified porous magnetic dextran microspheres. The adsorbent has very high adsorption capacity for perfluoro caprylic acid, and can be repeatedly used for a plurality of times, thus being low in cost and environment-friendly; furthermore, the melamine-modified porous magnetic dextran microspheres have magnetism, thus being easy to separate.

Description

technical field [0001] The invention relates to the technical field of a preparation method of a biosorbent, in particular to a preparation method of melamine-modified porous magnetic dextran microspheres and an application technology for perfluorooctanoic acid (PFOA) adsorption. Background technique [0002] Natural polymer magnetic microspheres are a new type of multifunctional material that has been developed in recent years and has been widely used in the fields of biomedicine, chemical separation and enrichment. It has the characteristics of both magnetic particles and polymer particles, and can be easily obtained from At the same time, the active groups on the polymer can be modified to load a variety of functional molecules to improve the specific function of the selectivity of the adsorbent, and because of its good biocompatibility, it can prepare multifunctional magnetic Microspheres are widely used in many fields. Porous dextran microspheres are soft gel microsphe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/36
CPCB01J20/24B01J20/28009B01J20/28021C02F1/286C02F2101/36
Inventor 李慧芝翟玉博赵淑英
Owner UNIV OF JINAN
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