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Method for preparing defluorination adsorbent by modifying starch and application of method

A starch modification and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of low adsorption performance, narrow pH range of use, limited application, etc., to achieve simple treatment, Easy industrial operation, low price effect

Inactive Publication Date: 2017-05-31
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low adsorption performance and narrow pH range of these materials limit their applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 100g of cornstarch into 400mL of phosphate buffer solution (pH6.0) to make starch milk, and add 1.25g of glucoamylase and 0.625g of α-amylase to the starch milk. After 6h in 55℃ water bath, add 50mL , 4% (m / v) NaOH solution to terminate the hydrolysis of starch by glucoamylase and α-amylase, and dry at 50°C to obtain porous starch to be modified;

[0023] Add the porous starch to be modified into the metal ion solution of zirconium oxychloride, and add the basic compound solution while stirring at 25°C to adjust the pH value of the mixed solution to 4.0; then continue stirring for 0.5h, and take out the precipitate with Wash with deionized water for several times to remove soluble salts, put in an oven at 50±2°C and dry for 2 hours to fully load the hydroxide on the porous starch to obtain the modified porous starch;

[0024] Take the above 0.04g prepared starch adsorbent and put it into a centrifuge tube filled with 25mL simulated fluorine-exceeding drinking water ...

Embodiment 2

[0027] Put 100g of cornstarch into 400mL of phosphate buffer solution (pH6.0) to make starch milk, and add 1.25g of glucoamylase and 0.625g of α-amylase to the starch milk. After 6h in 55℃ water bath, add 50mL , 4% (m / v) NaOH solution to terminate the hydrolysis reaction of glucoamylase and α-amylase to starch, and dry at 60°C to obtain porous starch to be modified;

[0028] Add the porous starch to be modified into the metal ion solution of zirconium oxychloride, add the basic compound solution while stirring at 25°C to adjust the pH value of the mixed solution to 7.0; then continue to stir for 2 hours, take out the precipitate for use Wash with deionized water for several times to remove soluble salts, put in an oven at 50±2°C and dry for 4 hours to fully load the hydroxide on the porous starch to obtain the modified porous starch;

[0029] Take the above 0.04g prepared starch adsorbent and put it into a centrifuge tube filled with 25mL simulated fluorine-exceeding drinking ...

Embodiment 3

[0032] Put 100g of cornstarch into 400mL of phosphate buffer solution (pH6.0) to make starch milk, and add 1.25g of glucoamylase and 0.625g of α-amylase to the starch milk. After 6h in 55℃ water bath, add 50mL , 4% (m / v) NaOH solution to terminate the hydrolysis of starch by glucoamylase and α-amylase, and dry at 55°C to obtain porous starch to be modified;

[0033] Add the porous starch to be modified into the metal ion solution of zirconium oxychloride, add the basic compound solution while stirring at 25°C to adjust the pH value of the mixed solution to 6.0; then continue to stir for 1.2h, take out the precipitate with Wash with deionized water several times to remove soluble salts, put it in a 50°C oven and dry for 3 hours to fully load the hydroxide on the porous starch to obtain the modified porous starch;

[0034] Take the above 0.04g prepared starch adsorbent and put it into a centrifuge tube filled with 25mL simulated fluorine-exceeding drinking water solution with a ...

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Abstract

The invention relates to a method for preparing a defluorination adsorbent by modifying starch and application of the method. The method comprises the following steps: firstly, performing enzymolysis on starch so as to obtain modified porous starch, soaking porous starch powder to be modified into a mixed solution of metal ions of zirconium, aluminum, iron, lanthanum, titanium and the like, enabling generated to be loaded with the porous starch under an alkali condition, washing precipitate with deionized water for multiple times to remove soluble salt, and finally drying, thereby ensuring that the hydroxide can be sufficiently loaded in tea dregs to prepare the defluorination adsorbent. The reaction conditions are gentle in the preparation process, the process route is simple and feasible, and industrial operation can be implemented, so that the method has the potential of large-scale popularization and application. The prepared defluorination adsorbent can be widely applied to production of drinking water with excessive fluorine, the purpose of removing fluorine can be achieved, and the method has the advantages of low cost, high efficiency, simple treatment, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of drinking water treatment agents, and in particular relates to a preparation method and application of a fluorine removal adsorbent prepared by modifying starch. Background technique [0002] Fluorine is an essential trace element for the human body, and a small amount of intake can prevent tooth and bone diseases. The United States and Canada added trace amounts of fluoride to drinking water in 1945 and 1946 to prevent dental caries. However, excessive intake of fluorine by the human body will not only affect the metabolism of calcium and phosphorus in the human body, leading to fluorosis, but also inhibit the activity of enolase, succinate dehydrogenase and other enzymes. The human body absorbs fluoride mainly through drinking water, food and drugs, but drinking water is the most important source of intake. WHO recommends that the fluorine concentration in drinking water be between 0.5-1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24C02F1/28B01J20/30
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/14
Inventor 蔡荟梅彭传燚陈贵杰徐凌云宛晓春柯飞
Owner ANHUI AGRICULTURAL UNIVERSITY
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