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Method for preparation of amidoxime functionalized hollow porous polymer microspheres with CO2 as emulsion template

A porous polymer, emulsion template technology, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of difficult structure control, difficult elution of internal phases, etc., to improve adsorption Capacity, high adsorption capacity, avoid binding instability effect

Active Publication Date: 2020-04-07
HANGZHOU ENJOY ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to overcome the problems that the internal phase is difficult to elute and the structure is not easy to control during the preparation of the existing Pickering emulsion template method, and to provide an amidoxime functionalized air-in-water emulsion template method for preparing hollow A porous adsorbent method, using amidoxime groups as selective ligands and using melamine resin as a substrate, prepared a hollow porous adsorbent (MF-AO-HPS) grafted with amidoxime functional groups on the surface

Method used

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  • Method for preparation of amidoxime functionalized hollow porous polymer microspheres with CO2 as emulsion template
  • Method for preparation of amidoxime functionalized hollow porous polymer microspheres with CO2 as emulsion template
  • Method for preparation of amidoxime functionalized hollow porous polymer microspheres with CO2 as emulsion template

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Experimental program
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Effect test

Embodiment 1

[0049] (1) Preparation of silica nanoparticles;

[0050] use Method to manufacture silica nanoparticles: In a flask, add 8.735g TEOS to 180mL of ethanol, after heating in a water bath to 35°C, add 10mL of NH 3 ·H 2 A mixed solution of O and 9.48g of water; then the formed mixed solution was reacted for 3.0h under magnetic stirring; after the reaction was completed, the product was collected by centrifugation and washed three times with deionized water and ethanol respectively; 200nm silica nanoparticles;

[0051] (2) preparation of hollow porous melamine resin;

[0052] At 85°C, 1.26g of melamine was added to 3.0mL of a mixed solution of 37% formaldehyde and 25% glutaraldehyde (v / v, 2:1), and then 2.0M Na 2 CO 3 Adjust the pH of the solution to 9.5, stir at 1500 rpm, and continue to react for 3.0 min after the solution turns from milky white to clear; then, add 10 mL of 10 wt % silicon dioxide aqueous dispersion under stirring, and continue to react for 20 min; then, coo...

Embodiment 2

[0064] (1) Preparation of silica nanoparticles;

[0065] use Method to manufacture silica nanoparticles: In a flask, add 8.0g TEOS to 170mL ethanol, heat in a water bath to 30°C, then add 9.0mL NH3 ··H 2 O and 9.0 g H 2 A mixed solution of O; then the formed mixed solution was reacted for 2.0 h under magnetic stirring; after the reaction was completed, the product was collected by centrifugation and washed three times with deionized water and ethanol respectively; after drying, a silica with a diameter of about 200 nm could be obtained Nanoparticles.

[0066] (2) preparation of hollow porous melamine resin;

[0067] Add 1.0 g of melamine to 2.0 mL of a mixed solution of 37% formaldehyde and 25% glutaraldehyde (v / v, 2:1) at 80°C, and then use 2.0M Na 2 CO 3 Adjust the pH of the solution to 9.0, stir at 1200rpm, and continue to react for 4.0min after the solution turns from milky white to clear; then, add 5.0mL of 10wt% silicon dioxide aqueous dispersion under stirring, an...

Embodiment 3

[0072] (1) Preparation of silica nanoparticles;

[0073] use Method to manufacture silica nanoparticles: In a flask, add 10g TEOS to 190mL ethanol, heat in a water bath to 40°C, then add 11mL NH 3 ·H 2 O and 10g H 2 A mixed solution of O. Then the resulting mixed solution was reacted for 4.0 h under magnetic stirring. After the reaction was completed, the product was collected by centrifugation and washed three times with deionized water and ethanol respectively. After drying, silica nanoparticles with a diameter of about 200 nm can be obtained.

[0074] (2) preparation of hollow porous melamine resin;

[0075] At 90°C, 2.0 g of melamine was added to 4.0 mL of a mixed solution of 37% formaldehyde and 25% glutaraldehyde (v / v, 2:1), and then 2.0 M Na 2 CO 3 The pH of the solution was adjusted to 10.0, stirred at 1600 rpm, and the reaction was continued for 5.0 min after the solution changed from milky white to clear; then, 15 mL of 10 wt % silica aqueous dispersion was ...

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Abstract

Belonging to the technical field of adsorption separation functional materials, the invention relates to a method for preparation of an amidoxime functionalized hollow porous adsorbent with CO2 as anemulsion template. The method includes: firstly, preparing silicon dioxide nanoparticles and MF-HP; adding MF-HP and PEA into ethanol, carrying out ultrasonic treatment and water bath reaction, and conducting washing, ethanol cleaning and drying to obtain MF-NH2-HP, adding the MF-NH2-HP into a glutaraldehyde aqueous solution, performing water bath, washing, alcohol washing and drying to obtain MF-CHO-HP, then adding the MF-CHO-HP and DAMN into an ethanol solution, performing water bath, washing, alcohol washing and drying to obtain MF-CN-HP, adding the MF-CN-HP and hydroxylamine hydrochlorideinto a mixed solution of water and ethanol, carrying out reaction, and then conducting washing, alcohol washing and drying to obtain MF-AO-HPS. By grafting PEA, the method provided by the invention provides possibility for subsequent modification of a large number of action sites, and combination with a hollow porous structure not only improves the adsorption capacity of adsorption U(VI), but alsoaccelerates the mass transfer kinetics.

Description

technical field [0001] The invention belongs to the technical field of preparation of adsorption and separation functional materials, in particular to a CO 2 A method for preparing an amidoxime functionalized hollow porous adsorbent as an emulsion template. Background technique [0002] Due to its special use in the nuclear industry, naturally occurring uranium resources have become strategic resources for the nuclear industry. The proven uranium resources mainly exist in seawater in the form of hexavalent uranium (U(VI)), which is about 4.5 billion tons, which means that seawater is a potential source of uranium resources. Due to the relative difficulty of extracting a large amount of uranium from seawater, its wide application is seriously limited. Furthermore, the presence of uranium in seawater is not only harmful to humans and the environment, but also dangerous due to its radioactive and chemical toxicity. Therefore, extracting uranium from seawater not only has eco...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F103/08
CPCB01J20/265B01J20/28021B01J20/30C02F1/285C02F2101/006C02F2103/08B01J20/262Y02P10/20B01J20/26
Inventor 白雪潘建明刘金鑫
Owner HANGZHOU ENJOY ENVIRONMENTAL PROTECTION TECH
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