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Aminopolycanboxylic acid porous material as well as preparation method and application thereof

A technology of amino polycarboxylic acid and porous material, which is applied in the field of amino polycarboxylic acid porous material and its preparation, and achieves the effects of stable chemical structure, high mechanical strength and easy separation

Active Publication Date: 2019-08-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of the porous material formed by the oil-in-water concentrated emulsion method is generally lipophilic, and it is difficult to use it in water-based systems such as water treatment, water-based systems, etc. Low cost and ease of operation are important prerequisites for the practical application of adsorbents

Method used

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  • Aminopolycanboxylic acid porous material as well as preparation method and application thereof
  • Aminopolycanboxylic acid porous material as well as preparation method and application thereof

Examples

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preparation example Construction

[0037]

[0038] A kind of preparation method of amino polycarboxylic acid porous material, it comprises the steps:

[0039] (1) Disperse the rigid particles in an aqueous solution of polyethyleneimine, adjust the pH value to 10.5-12.5, add the oil phase under stirring, and obtain an oil-in-water emulsion;

[0040] (2) After adding a cross-linking agent into the oil-in-water emulsion, continue to stir for 1-3 minutes, and stand at 0-90°C for 6-48 hours to solidify; use ethanol to perform Soxhlet extraction and then vacuum-dry, or carry out cross-linking Add cyclohexane to the final system for azeotropic dehydration, then carry out distillation and deoiling, and then carry out vacuum drying to obtain a porous material;

[0041] (3), put the porous material into the aqueous solution of haloacetic acid (the amount is 1-3 molar equivalents of residual amino hydrogen), add a buffer solution with a pH value of 7-9, or continuously add sodium carbonate solution, dilute hydrogen Sod...

Embodiment 1

[0065] The preparation method of the amino polycarboxylic acid porous material of the present embodiment comprises the steps:

[0066] (1), adding silicon dioxide (particle size is 100 μm, 0.18g) to branched polyethyleneimine (M n =60000, 0.1g / mL, 3mL) in the aqueous solution, stir and disperse, adjust the pH value to 11, under vigorous stirring, add cyclohexane (6mL) dropwise to the aqueous dispersion, and drop it within 10min to obtain water Oil-in-emulsion;

[0067] (2), then add polyethylene glycol diglyceryl ether (M n =500, 0.87g, 0.25 equivalent of NH), continue to stir for 1min, and stand to solidify at 25°C for 6h; add 20mL cyclohexane to the system, then heat to reflux and separate most of the water with an oil-water separator, and then The cyclohexane was evaporated, and the remaining solid was vacuum-dried to obtain a porous material;

[0068] (3), get chloroacetic acid (1.485g, 15.7mmol) and dissolve in the phosphate buffer (0.2mol / L, 40mL), drop into the porou...

Embodiment 2

[0070] Same as Example 1, but with the same weight of microcrystalline cellulose instead of silicon dioxide particles, the amino polycarboxylic acid porous material is similarly obtained.

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Abstract

The invention provides an aminopolycanboxylic acid porous material as well as a preparation method and an application thereof. The preparation method of the aminopolycanboxylic acid porous material comprises steps as follows: rigid particles are dispersed in an aqueous solution of polyethyleneimine, the pH value is regulated, an oil phase is added during stirring, and an oil-in-water emulsion is obtained; a cross-linking agent is added to the oil-in-water emulsion for cross-linking, deoiling and dehydration are performed, and a porous material is obtained by drying; the porous material is added to an aqueous solution containing haloacetic acid and subjected to a reaction under the alkaline condition, and the aminopolycanboxylic acid porous material is obtained. When the porous material isused as an adsorbent, the porous material can be regenerated by regulating the pH value, and organic anions are adsorbed under the low pH value and desorbed under the high pH value generally; organiccations are adsorbed under the high pH value and desorbed under the low pH value; metal ions are adsorbed near the neutral pH value and can be regenerated when the pH ranges from 1 to 3; compared withthe prior art, the aminopolycanboxylic acid porous material has the characteristics of being large in size, higher in mechanical strength, easy to regenerate, easy to separate and the like.

Description

technical field [0001] The invention belongs to the technical field of material environmental protection and separation, and in particular relates to an amino polycarboxylic acid porous material and its preparation method and application. Background technique [0002] At present, there are many deficiencies in the use of adsorbents for environmental treatment and separation and purification. For example, some adsorbents are too small to be easily separated from the adsorption system; some adsorbents are difficult to regenerate. function, it is difficult to detach. In addition, regeneration and reuse, and ease of operation all place high demands on the adsorbent. [0003] The preparation of macroporous materials generally faces two challenges: low mechanical strength and difficult surface functionalization. Through-hole materials can be conveniently prepared by water-in-oil thick emulsion, but the obtained materials are usually like chalk, which is easy to be brittle and b...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J9/40C08J3/24C08L79/02C08L1/04C08K3/36B01J20/26
CPCB01J20/267C08J3/24C08J3/246C08J9/28C08J9/40C08J2379/02C08J2401/04
Inventor 万德成金明潘海燕
Owner TONGJI UNIV
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