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Polysaccharide-based heavy metal adsorption material and preparation method thereof

A technology for adsorbing materials and heavy metals, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorbed water/sewage treatment, etc. The effect of high amount and increasing adsorption capacity

Pending Publication Date: 2019-01-11
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pectin is a biodegradable, non-toxic natural polyanionic polysaccharide, which contains carboxyl and hydroxyl groups, and can coordinate with heavy metal ions. Defects such as convenient follow-up processing and inability to recycle

Method used

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  • Polysaccharide-based heavy metal adsorption material and preparation method thereof
  • Polysaccharide-based heavy metal adsorption material and preparation method thereof
  • Polysaccharide-based heavy metal adsorption material and preparation method thereof

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preparation example Construction

[0038] A preparation method of a polysaccharide-based heavy metal adsorption material, comprising the following steps:

[0039] (1) An appropriate amount of NaOH solid is dissolved in 85%-95% (v / v) ethanol solution, and the concentration of 500ml is prepared as a NaOH alcohol solution of 0.5mol / L-1.0mol / L for use;

[0040] (2) Dissolve 5g-10g of citrus pectin powder in 500ml of NaOH alcohol solution, and stir and react at 4°C-10°C for 3-5 hours;

[0041] (3) Stand overnight, filter under reduced pressure, filter residue is dissolved in the ethanol solution of 50%-70% (v / v), and adjust its pH with the HCl solution of 3mol / L-5mol / L to be about about 1-3, room temperature Place it under low conditions for 1-3 hours;

[0042] (4) After vacuum filtration, the filter residue was dissolved in 250ml of 50%-70% (v / v) ethanol solution (containing 0.5-2% HCl solution), and stirred and reacted at 25°C-35°C for 30-60 minutes;

[0043] (5) Filtrate under reduced pressure, rinse the filter...

Embodiment 1

[0049] A preparation method of a polysaccharide-based heavy metal adsorption material, comprising the following steps:

[0050] (1) An appropriate amount of NaOH solid is dissolved in 85% (v / v) ethanol solution, and the NaOH alcohol solution that the preparation 500ml concentration is 0.5mol / L is stand-by;

[0051](2) Dissolve 5g of citrus pectin powder in 500ml of NaOH alcohol solution, and stir and react at 4°C for 3 hours;

[0052] (3) Stand overnight, filter under reduced pressure, dissolve the filter residue in 50% (v / v) ethanol solution, adjust its pH to about 1 with 3mol / L HCl solution, and place it at room temperature for 1 hour;

[0053] (4) After filtration under reduced pressure, the filter residue was dissolved in 250ml of 50% (v / v) ethanol solution (containing 0.5% HCl solution), and stirred and reacted at 25°C for 30 minutes;

[0054] (5) Filtrate under reduced pressure, rinse the filter residue three times with 50% (v / v) ethanol solution, and freeze-dry to obta...

Embodiment 2

[0059] A preparation method of a polysaccharide-based heavy metal adsorption material, comprising the following steps:

[0060] (1) An appropriate amount of NaOH solid is dissolved in 95% (v / v) ethanol solution, and the NaOH alcohol solution that the concentration of 500ml is prepared is 1.0mol / L for stand-by;

[0061] (2) Dissolve 10 g of citrus pectin powder in 500 ml of NaOH alcohol solution, and stir and react at 10° C. for 5 hours;

[0062] (3) Stand overnight, filter under reduced pressure, dissolve the filter residue in 70% (v / v) ethanol solution, adjust its pH to about 3 with 5mol / L HCl solution, and place it at room temperature for 3 hours;

[0063] (4) After filtration under reduced pressure, the filter residue was dissolved in 250ml of 70% (v / v) ethanol solution (containing 2% HCl solution), and stirred and reacted at 35°C for 60 minutes;

[0064] (5) Filtrate under reduced pressure, rinse the filter residue three times with 70% (v / v) ethanol solution, and freeze-d...

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Abstract

The invention discloses a polysaccharide-based heavy metal adsorption material and a preparation method thereof. The preparation method comprises the following steps: dissolving a NaOH solid in an ethanol solution to obtain an alcohol solution of NaOH; taking and dissolving citrus pectin powder in the alcohol solution of NaOH, and performing a stirring reaction; standing the obtained product overnight, carrying out reduced pressure filtration, dissolving the obtained filter residue in the ethanol solution, adjusting the obtained solution to be strong acidic, and standing the adjusted solution;carrying out reduced pressure filtration on the obtained product, dissolving the obtained filter residue in a mixed solution of an ethanol solution and a HCl solution, and carrying out a stirring reaction; carrying out reduced pressure filtration on the obtained product, flushing the obtained filter residue with the ethanol solution, and freeze-drying the filter residue to obtain modified pectinpowder; dissolving the modified pectin powder in deionized water to obtain a modified pectin solution; dropwise adding the modified pectin solution to a calcium chloride solution while stirring, and carrying out a reaction; and filtering the obtained solution by a screen after the reaction is completed to obtain microspheres, cleaning the microspheres with deionized water, and freeze-drying the cleaned microspheres to obtain calcium ion-crosslinked modified pectin microspheres which are the heavy metal adsorption material.

Description

technical field [0001] The invention relates to the field of heavy metal ion adsorption, in particular to a polysaccharide-based heavy metal adsorption material and a preparation method thereof. Background technique [0002] While the rapid development of modern industry drives the economy, it also leads to increasing heavy metal pollution. Due to the characteristics of rapid diffusion, high toxicity, and non-biodegradability of heavy metal ions, how to remove them efficiently and safely has become a research hotspot. The removal methods of heavy metal ions generally include: chemical precipitation, adsorption, membrane filtration, ion exchange, electrodialysis and flocculation. Because the adsorption method has high economic efficiency, is green and pollution-free, and has good reproducibility, it has become the preferred method among these technologies. Chemical adsorption is the main adsorption method, because the functional groups of some adsorbents can chelate metal i...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/041B01J20/046B01J20/22B01J20/24B01J20/28021C02F1/286C02F2101/20
Inventor 李健军许昭李芬李骁勇白艳红
Owner XI AN JIAOTONG UNIV
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