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A kind of porous composite material capable of adsorbing heavy metal ions and its preparation method and application

A porous composite material, a technology for adsorbing heavy metals, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem of low selectivity of heavy metal ions, secondary pollution, and poor adsorption of porous materials and other issues, to achieve the effect of being environmentally friendly, easy to degrade, and promoting the adsorption of heavy metals

Active Publication Date: 2019-05-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many related studies on how to deal with heavy metal ions, but the traditional porous materials for dealing with heavy metal ions still have the following defects: First, the adsorption of porous materials is not strong, the selectivity for heavy metal ions is not high, and the separation cannot be achieved. The purpose of recycling; the second is that the use of foaming agents, cross-linking curing agents and other chemical agents in the production of porous materials is likely to cause environmental pollution, and after use, it is not biodegradable and cannot be recycled to form an environmental burden and secondary pollution.
[0004] Most natural polymers contain active functional groups such as hydroxyl, carboxyl, and amino groups, which are easy to adsorb heavy metal ions through electrostatic interaction, coordination complexation, etc., and have a wide range of sources, cheap and easy to obtain, and have good biocompatibility and biodegradability However, the single natural polymer adsorption material has defects such as low mechanical properties and poor mechanical properties, which limit its wide application.

Method used

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  • A kind of porous composite material capable of adsorbing heavy metal ions and its preparation method and application
  • A kind of porous composite material capable of adsorbing heavy metal ions and its preparation method and application
  • A kind of porous composite material capable of adsorbing heavy metal ions and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a porous material, comprising the steps of:

[0038]1) Preparation of foam matrix: Add 0.1 parts of gum arabic, 10 parts of hydroxyethyl chitosan, and 20 parts of polymalic acid to 1000 parts of deionized water, and stir at 10°C for 1 Hours, to obtain foam matrix mixed solution.

[0039] 2) Microorganism culture and matrix foaming: 0.2 parts by mass of chlorella, 0.15 parts of sodium nitrate, 0.06 parts of ferric ammonium citrate, 0.06 parts of magnesium sulfate, 0.05 parts of pH potassium citrate-citric acid The buffer solution was added to 40 parts of the foamed matrix mixture obtained in step 1), the stirring speed was set to 500 r / min, stirred for 0.1 hour, and placed in a constant temperature incubator at 25° C. to obtain the foamed matrix.

[0040] 3) Foaming matrix gelation molding: put the foamed matrix in step 2) in an environment of -50°C to freeze, thaw in an environment of 20°C, and irradiate with ultraviolet light for 2 hours.

[00...

Embodiment 2

[0049] A method for preparing a porous material, comprising the steps of:

[0050] 1) Preparation of foaming matrix: Add 10 parts by mass of starch, 0.5 part of cellulose, 0.1 part of polyvinyl alcohol, and 0.6 part of polyethylene glycol to 800 parts of deionized water, and heat at 100°C Under stirring for 2 hours, a foaming matrix mixed solution was obtained.

[0051] 2) Microbial culture and matrix foaming: the mass parts are 0.1 parts of Escherichia coli, 0.02 parts of glucose, 0.01 parts of magnesium sulfate, 0.02 parts of calcium carbonate, 10 parts of distilled water, 5 parts of tartaric acid-sodium malate The buffer solution was added to 10 parts of the foamed matrix mixture obtained in step 1), the stirring speed was set to 100 r / min, stirred for 0.1 hour, and placed in a constant temperature incubator at 37° C. to obtain the foamed matrix.

[0052] 3) Gelation molding of the foamed matrix: the foamed matrix in step 2) was frozen at -50°C, thawed at 50°C, and cycled ...

Embodiment 3

[0061] A method for preparing an adsorbable porous material, comprising the steps of:

[0062] 1) Preparation of foam matrix: add 6 parts by mass of sodium alginate, 0.2 part of hydroxyethyl cellulose, 0.2 part of gelatin, 20 parts of ethylene-vinyl acetate copolymer to 100 parts of deionized water, stirred at 120° C. for 12 hours to obtain a foaming matrix mixture.

[0063] 2) Microorganism culture and matrix foaming: 0.6 parts by mass of Gram-positive cocci, 1000 parts of wort, 0.06 parts of sodium nitrate, 0.15 parts of magnesium sulfate, 0.05 parts of dipotassium hydrogen phosphate-potassium dihydrogen phosphate The buffer solution was added to 100 parts of the foamed matrix mixture obtained in step 1), the stirring speed was set to 50 r / min, stirred for 5 hours, and placed in a constant temperature incubator at a temperature of 30° C. to obtain the foamed matrix.

[0064] 3) Gelation molding of the foamed matrix: heat the foamed matrix in step 2) to 50°C, keep at a const...

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Abstract

The invention discloses a porous composite capable of adsorbing heavy metals ions and a preparation method and application thereof; the porous composite is prepared by introducing microorganisms to natural polymer material and synthetic polymers as materials; the preparation method includes the steps of 1), preparing a foam substrate; 2), performing microorganism culture and substrate foaming; 3), gelling the foam substrate; 4), purifying the porous material, and drying to remove small molecules hot crosslinked and microorganisms not immobilized to the substrate, lyophilizing after dialysis to obtain the porous composite capable of adsorbing heavy metal ions. The whole preparation process of the natural environment-friendly composite is simple, pollution-free and nontoxic, and the composite is biodegradable; the composite is reusable and biodegradable.

Description

【Technical field】 [0001] The invention belongs to the field of porous composite materials, and in particular relates to a porous composite material capable of absorbing heavy metal ions, a preparation method and application thereof. 【Background technique】 [0002] The pollution of heavy metals has always been one of the serious problems facing the world today. Heavy metals are widely distributed in the earth's atmosphere, hydrosphere and soil, and can be exchanged among them and enter the food chain, endangering human health. Therefore, the preparation of porous materials capable of adsorbing heavy metal ions is one of the effective ways to solve this environmental pollution problem and recover heavy metals. [0003] At present, there are many related studies on how to deal with heavy metal ions, but the traditional porous materials for dealing with heavy metal ions still have the following defects: First, the adsorption of porous materials is not strong, the selectivity for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30B01J20/28C02F1/28C02F101/20C02F101/22
CPCB01J20/24B01J20/265B01J20/28054C02F1/288C02F2101/20C02F2101/22
Inventor 张敏杨鱼李成涛
Owner SHAANXI UNIV OF SCI & TECH
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