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Method for preparing absorbing material based on modified konjac glucomannan

A technology of konjac glucomannan and adsorption materials, which is applied in the field of preparation of glucomannan derivatives, can solve problems such as high viscosity, small ion adsorption selectivity, and weak coordination ability, and achieve enhanced complexation and adsorption The effect of multiple sites, low production and use costs

Inactive Publication Date: 2011-08-24
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified konjac glucomannan solves the shortcomings of natural konjac glucomannan, such as weak coordination ability with metal ions, high viscosity, and low selectivity for ion adsorption, and also provides the ability to adsorb metal ions in water and oily solvents. It provides a feasible and effective solution for konjac glucomannan in the adsorption of heavy metals, especially for the treatment of wastewater containing most rare earth metal elements and radionuclides; moreover, the modified konjac glucomannan and metal complexes After being in place, it can form a porous three-dimensional network structure compound, which has potential application prospects in gas storage and capture.

Method used

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  • Method for preparing absorbing material based on modified konjac glucomannan

Examples

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Embodiment 1

[0026] A preparation method of an adsorption material based on modified konjac glucomannan, comprising the following steps:

[0027] 5 parts of konjac fine powder are swelled in 50% acetic acid aqueous solution at 40°C for 12 hours, then vacuum filtered, and then washed with anhydrous acetic acid to remove residual moisture (washed at least three times), and added to 100 parts of phthalic anhydride dissolved in 15 parts In the acetic acid solution, when the reaction temperature was adjusted to 100°C, 20 parts of anhydrous pyridine was quickly added as a catalyst. After reacting for 5 hours, the product was precipitated with 50% ethanol aqueous solution, vacuum filtered after complete precipitation, and the remaining water was washed with ethanol (at least three times). The final product was obtained after the product was dried in a blast oven at 50° C. for 20 hours.

Embodiment 2

[0029] A preparation method of an adsorption material based on modified konjac glucomannan, comprising the following steps:

[0030]Five parts of konjac fine powder are swelled in 50% ethanol aqueous solution at 25°C for 24 hours, then vacuum filtered, and then washed with absolute ethanol to remove residual water (washed at least three times), and added to 100 parts of phthalic anhydride dissolved in 15 parts In the ethanol solution of , when the reaction temperature was adjusted to 100°C, 20 parts of anhydrous pyridine was quickly added as a catalyst. After reacting for 8 hours, the product was precipitated with 50% ethanol aqueous solution, vacuum filtered after complete precipitation, and the remaining water was washed with ethanol (at least three times). The final product was obtained after the product was dried in a blast oven at 50° C. for 20 hours.

Embodiment 3

[0032] A preparation method of an adsorption material based on modified konjac glucomannan, comprising the following steps:

[0033] 5 parts of konjac fine powder were swelled in 50% triethylamine aqueous solution at 50°C for 4 hours, then vacuum filtered, and then washed with anhydrous acetic acid to remove residual water (washed at least three times), and added to 15 parts of o-nitrate dissolved in In 100 parts of acetic acid solution of base phthalic anhydride, when the reaction temperature is adjusted to 100°C, 20 parts of 0.1 sulfuric acid (the solvent is anhydrous acetic acid) is quickly added as a catalyst. After reacting for 8 hours, the product was precipitated with 50% ethanol aqueous solution, vacuum filtered after complete precipitation, and the remaining water was washed with ethanol (at least three times). The final product was obtained after the product was dried in a blast oven at 50° C. for 20 hours.

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Abstract

The invention discloses a method for preparing an absorbing material based on modified konjac glucomannan. The method is characterized by comprising the following steps of: soaking konjac glucomannan in mixed solution of an organic small molecular swelling solvent and water, swelling for 2 to 24 hours, performing vacuum filtration, and washing a solid by using an organic small molecular solvent to remove residual moisture; and adding the swollen konjac glucomannan into a heterocyclic or aromatic derivative which is dissolved by the organic small molecular solvent and has lone electron pairs or / and free electrons, stirring and reacting for 1 to 72 hours in the presence of a catalyst at the temperature of between 50 and 120 DEG C, precipitating a material obtained after the reaction by using a precipitation solvent, filtering, and washing and drying a solid to obtain modified konjac glucomannan powder. In the method, the modified konjac glucomannan has the characteristic of absorbing heavy metal ions; and the absorbing material can be widely used for treating heavy metal ions, radioactive nuclide wastewater and the like produced by mining industry, chemical industry, nuclear industry and the like.

Description

technical field [0001] The invention belongs to a preparation method of glucomannan derivatives, and relates to a preparation method of an adsorption material based on modified konjac glucomannan. The modified konjac glucomannan prepared by the method of the invention is used as an adsorption material, and is especially suitable for the treatment of heavy metal (including most rare earth metal elements and radionuclides) wastewater. Background technique [0002] Heavy metal (including most rare earth metal elements and radioactive elements) wastewater mainly comes from mining, electroplating, chemical and nuclear industries, etc. If the wastewater containing heavy metals including most rare earth metal elements and radionuclides produced by such industries is discharged into the natural water system , not only poses a threat to aquatic organisms, but may accumulate in large quantities through precipitation, adsorption, and food chain enrichment, seriously damaging the ecosys...

Claims

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Application Information

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IPC IPC(8): C08B37/02B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 张驰韩本超罗学刚林晓艳
Owner SOUTHWEAT UNIV OF SCI & TECH
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