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Starch-based montmorillonoid composite adsorption material with various charges distributed on surface and preparation method of starch-based montmorillonoid composite adsorption material

A composite adsorption material, charge distribution technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as rare reports in research, achieve fast sedimentation, strong adhesiveness, and improve flocculation performance. Effect

Inactive Publication Date: 2018-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many studies on cationic and amphoteric starch in China, but there are few reports on the multi-component modified starch that combines cationic, anionic and nonionic.

Method used

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  • Starch-based montmorillonoid composite adsorption material with various charges distributed on surface and preparation method of starch-based montmorillonoid composite adsorption material
  • Starch-based montmorillonoid composite adsorption material with various charges distributed on surface and preparation method of starch-based montmorillonoid composite adsorption material
  • Starch-based montmorillonoid composite adsorption material with various charges distributed on surface and preparation method of starch-based montmorillonoid composite adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The first step is to weigh 200g of corn dry starch into the reactor, add 800g of deionized water, stir evenly, and prepare a starch milk solution with a concentration of 20% by mass.

[0048] In the present embodiment, the scanning electron microscope picture of native starch magnified 2000 times is as figure 1 As shown, the surface of unmodified native starch is relatively smooth, and the particles are relatively dispersed.

[0049]The second step is to add 4g of NaOH solid to the starch milk solution, stir magnetically, mix evenly, place in the electrophoresis tank, adjust the voltage to 120v, and slowly add 20ml of 3-chloro-2-hydroxy with a mass concentration of 69% under the action of an electric field Propyltrimethylammonium chloride solution, placed in a water bath at 50°C for 4 hours, centrifuged the reacted solution, filtered to remove the supernatant, washed the precipitate three times alternately with absolute ethanol and deionized water, and then The precipi...

Embodiment 2

[0057] The first step is to weigh 200g of corn dry starch into the reactor, add 470g of deionized water, stir evenly, and prepare a starch milk solution with a concentration of 30% by mass.

[0058] The second step is to add 4g of NaOH solid to the starch milk solution, stir magnetically, mix evenly, place in the electrophoresis tank, adjust the voltage to 135v, and slowly add 120ml of 3-chloro-2-hydroxy with a mass concentration of 69% under the action of an electric field Propyltrimethylammonium chloride solution, reacted in a water bath at 40°C for 7 hours, centrifuged the reacted solution, filtered to remove the supernatant, washed the precipitate three times alternately with absolute ethanol and deionized water, and then washed the precipitate The material was dried, ground to powder, weighed and recorded the powder mass.

[0059] The third step weighs 6g sodium tripolyphosphate (Na 5 P 3 o 10 ·H 2 O) be dissolved in 50ml deionized water, add 12g urea (CO(NH 2 ) 2 )...

Embodiment 3

[0064] The first step is to weigh 200g of corn dry starch into the reactor, add 600g of deionized water, stir evenly, and prepare a starch milk solution with a concentration of 25% by mass.

[0065] The second step is to add 4g of NaOH solid to the starch milk solution, stir magnetically, mix evenly, place it in the electrophoresis tank, adjust the voltage to 150v, and slowly add 70ml of 3-chloro-2-hydroxypropyl with a mass concentration of 69% under the action of an electric field base trimethylammonium chloride solution, reacted in a water bath at 60°C for 5.5 hours, centrifuged the reacted solution, filtered to remove the supernatant, washed the precipitate three times alternately with absolute ethanol and deionized water, and then washed the precipitate Dry, grind to powder, weigh and record the powder mass.

[0066] The third step weighs 13g sodium tripolyphosphate (Na 5 P 3 o 10 ·H 2 O) be dissolved in 50ml deionized water, add 4g urea (CO(NH 2 ) 2 ), mix well, and...

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Abstract

The invention discloses a starch-based montmorillonoid composite adsorption material with various charges distributed on the surface and a preparation method of the starch-based montmorillonoid composite adsorption material, and belongs to the technical field of preparation of absorbents. The method comprises the following steps: (1) preparing a starch milk solution; (2) carrying out cationizationon starch molecules; (3) preparing negative ions and a nonionic solution; (4) carrying out anionization on the starch molecules, and introducing a nonionic group; and (5) preparing the starch-based montmorillonoid composite adsorption material. By molecular modification such as amination, phosphate esterification and net working, cations, anions and nonionic groups are introduced, the various charges are distributed on the surface, and a special molecular structure space effect is achieved. The montmorillonoid as a traditional adsorbent is introduced, the specific surface area is increased, and the adsorption capacity is increased. The starch-based montmorillonoid composite adsorption material with various charges distributed on the surface has double adsorption characteristics of anion and cation starch and the montmorillonoid, and the composite absorption material is easily separated after absorption is finished.

Description

technical field [0001] The invention belongs to the technical field of preparation of natural polymer composite materials, and in particular relates to a starch-based montmorillonite composite adsorption material with multiple charge distributions on the surface and a preparation method thereof. Background technique [0002] Starch, as a renewable resource second only to cellulose, has the characteristics of cheap and easy to obtain, degradable, and can be easily converted into useful derivatives by biochemical methods. For a long time, all countries in the world have attached great importance to the research on the development and utilization of starch resources, especially the preparation of new natural polymer adsorbents by modifying starch has always been a research hotspot for scientific and technological workers. At present, there are many studies on cationic and amphoteric starch in China, but there are few reports on the research on multi-component modified starch th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24C02F1/286C02F2101/20
Inventor 胡飞李禹欣
Owner SOUTH CHINA UNIV OF TECH
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