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Preparation method of adsorption material based on modified konjac glucomannan

A konjac glucomannan and adsorption material technology, applied in the field of preparation of glucomannan derivatives, can solve the problems of small ion adsorption selectivity, weak coordination ability, high viscosity, etc., and achieve many adsorption sites and production And the effect of low cost and enhanced complexing ability

Inactive Publication Date: 2019-01-15
陕西镇安华兴特色农产品开发有限公司
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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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Effect test

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 were swelled in 50% acetic acid aqueous solution at 40°C for 12 hours, then vacuum filtered, then washed off residual moisture with anhydrous acetic acid (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]5 parts of konjac fine powder were swelled in 50% ethanol aqueous solution at 25°C for 24 hours, then vacuum filtered, then washed off residual moisture with absolute ethanol (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 off residual moisture with anhydrous acetic acid (washed at least three times), and added to the solution containing 15 parts of o-nitrate In 100 parts of acetic acid solution of base phthalic anhydride, when the reaction temperature was adjusted to 100°C, 20 parts of 0.1 sulfuric acid (the solvent was anhydrous acetic acid) 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.

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Abstract

The invention discloses a preparation method of an adsorption material based on modified konjac glucomannan. The method is characterized by: soaking konjac glucomannan in a mixed solution of an organic small molecule swelling solvent and water, conducting swelling for 2-24h, then conducting vacuum pumping and filtration, washing solids with the organic small molecule solvent to remove residual water; and adding the swollen konjac glucomannan into an organic small molecule solvent dissovled heterocycle or aromatic derivative with lone electron pair or / or free electrons, in the presence of a catalyst, carrying out stirring reaction at 50DEG C-120DEG C for 1-72h, then precipitating the reacted material with a precipitation solvent, then conducting filtering, and washing and drying the solid,thus obtaining the modified konjac glucomannan powder. According to the invention, modified konjac glucomannan has the characteristic of adsorbing heavy metal ions, and can be widely applied to treatment of heavy metal ion and radionuclide wastewater and the like produced by mining industry, chemical industry, nuclear industry, etc.

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 particularly 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 ecos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28054B01J2220/4825C02F1/286C02F2101/20
Inventor 徐荣娥李洪平邓小鹏张达荣
Owner 陕西镇安华兴特色农产品开发有限公司
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