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A kind of preparation method of starch/polyethyleneimine composite magnetic adsorption material

A polyethyleneimine, adsorption material technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., to achieve the effects of high specific surface area, cheap and abundant raw materials, and simple and easy process

Active Publication Date: 2021-06-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Starch and polyethyleneimine are good cross-linked polymers. Because they have functional groups that chelate mercury ions such as hydroxyl and amino groups, they can maintain the characteristics of magnetic nanoparticles and obtain efficient adsorption of mercury ions. Aldehydes cross-link potato starch and polyethyleneimine onto functionalized Fe3O4, a process that has not been investigated in the literature on mercury ion removal sorbents so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method of starch / polyethyleneimine composite magnetic adsorption material is carried out according to the following steps:

[0026] (1) First, take 2g of nano-ferric oxide and disperse it ultrasonically in 500ml of 0.125mol / l HCl solution for 60 minutes, separate the ferric oxide with a magnet, and wash it with distilled water and absolute ethanol several times to ensure complete removal of HCl;

[0027] (2) Add 2 g of acidified carrier ferric oxide into a round bottom flask containing 200 ml of distilled water and 800 ml of ethanol, ultrasonically disperse at room temperature for 30 min, then add 20 ml of ammonia water and 5 ml of ethyl orthosilicate dropwise, and continue stirring at room temperature for 6 h. Repeated washing with distilled water and absolute ethanol, drying;

[0028] (3) Add the product of (2) into a three-neck flask containing 800ml of ethanol and 280ml of distilled water, and 0.2g of cetyltrimethylammonium bromide for ultrason...

Embodiment 2

[0032] The difference from Example 1 is that the ferric oxide in the step (1) is replaced by a mesoporous material without magnet separation; the silane coupling agent in the step (4) is 3-aminopropyl trimethyl Oxygen silane; The mass ratio of the carrier and the silane coupling agent in the step (4) is 1:2. The silane coupling agent in the step (5) is 3-aminopropyltrimethoxysilane; the starch in the step (5) is cornstarch, and the mass ratio of the starch and the silane coupling agent is 1:3, The mass ratio of the starch to polyethyleneimine is 1:5. The obtained adsorbent is tested, and the adsorption capacity is 239.64mg / g, and the removal rate is 94.59%.

Embodiment 3

[0034] The difference from Example 1 is that the ferric ferric oxide in the step (1) is replaced by diatomaceous earth, without magnetic separation; the silane coupling agent in the step (4) is mercaptopropyltrimethoxy Silane; the mass ratio of the carrier in the step (4) to the silane coupling agent is 1:5. The silane coupling agent in the described step (5) is mercaptopropyltrimethoxysilane; the starch in the described step (5) is wheat starch, and the mass ratio of the starch and the silane coupling agent is 1:5, and the described The mass ratio of starch to polyethyleneimine is 1:10. The obtained adsorbent was tested, and the adsorption capacity of the material was 231.18mg / g, and the removal rate was 91.25%.

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Abstract

The invention relates to the technical fields of preparation of functionalized starch / polyethyleneimine composite magnetic adsorption material and mercury ion adsorption, and in particular to a preparation method of starch / polyethyleneimine composite magnetic adsorption material. The prepared adsorbent is effective Remove mercury ions from water.

Description

technical field [0001] The invention relates to the technical fields of preparation of functionalized starch / polyethyleneimine composite magnetic adsorption material and mercury ion adsorption, and in particular to a preparation method of functionalized starch / polyethyleneimine composite magnetic adsorption material with high efficiency and selective adsorption . Background technique [0002] The pollution of heavy metals to water bodies has become a serious environmental problem. Mercury ions and their compounds in water are highly toxic substances, causing serious harm to the natural environment and human health. Mercury ions in water can enter the human body through the food chain, especially aquatic products. Mercury can accumulate in the body and is difficult to excrete through its own metabolism. Mercury ingested in the human body will damage the liver and kidneys, and cause serious damage to the brain and nervous system. Irreversible damage, moreover, it can easily c...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/261B01J20/28009C02F1/288C02F2101/20
Inventor 胡建设武莹付永
Owner NORTHEASTERN UNIV
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