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Hyperbranched polyamide modified sodium alginate microsphere for heavy metal ion adsorption and preparation method thereof

A technology of hyperbranched polyamide and heavy metal ions, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problem of affecting the adsorption capacity of heavy metals, occupying sodium alginate, and failing to achieve adsorption. effect and other problems, to achieve the effect of low processing equipment requirements, enhanced adsorption effect, and simple and convenient preparation method

Inactive Publication Date: 2019-01-25
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of cross-linking agent will occupy the functional groups of sodium alginate, affecting its ability to adsorb heavy metals
In order to overcome the above defects, many studies have focused on grafting functional groups on sodium alginate and then cross-linking, which has increased the stability and adsorption performance of sodium alginate to a certain extent, but there are still some shortcomings: the grafted Part of the functional groups still participate in the cross-linking; most of the functional groups are embedded in the interior of the microspheres, and only some of the functional groups are exposed on the surface of the microspheres for adsorption, which cannot achieve the ideal adsorption effect

Method used

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  • Hyperbranched polyamide modified sodium alginate microsphere for heavy metal ion adsorption and preparation method thereof
  • Hyperbranched polyamide modified sodium alginate microsphere for heavy metal ion adsorption and preparation method thereof
  • Hyperbranched polyamide modified sodium alginate microsphere for heavy metal ion adsorption and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0049] (1) 2g of sodium alginate powder was added to deionized water to prepare a 2wt% sodium alginate solution; then added dropwise to 5wt% CaCl 2 In the solution, the mass volume ratio of the two is 1:1.5, stirring while adding, the magnetic stirring speed is 800rpm, cross-linking at room temperature for 7 hours, filtering, and repeated washing with deionized water to obtain sodium alginate microspheres;

[0050] (2) Then put sodium alginate microspheres into 100mL glutaraldehyde solution with a concentration of 0.2mol / L, add 2mL hydrochloric acid with a concentration of 1mol / L, keep the temperature at 60°C, and react with magnetic stirring for 6 hours at a magnetic stirring speed of 600rpm , filter, and wash with deionized water; obtain sodium alginate microspheres containing aldehyde groups on the surface;

[0051] (3) Then put sodium alginate microspheres containing aldehyde groups on the surface into 100mL hyperbranched polyamide solution with a concentration of 2g / L, ke...

Embodiment 2

[0062] (1) Add 2g of sodium alginate powder into deionized water to prepare a 2wt% sodium alginate solution. Then add 1wt% CaCl dropwise 2 In the solution, the mass volume ratio of the two is 1:1, stirring while adding, the magnetic stirring speed is 800rpm, cross-linking at room temperature for 6 hours, filtering, and repeated washing with deionized water to obtain sodium alginate microspheres;

[0063] (2) Then put sodium alginate microspheres into 100mL glutaraldehyde solution with a concentration of 0.19mol / L, add 2mL hydrochloric acid with a concentration of 1mol / L, keep the temperature at 60°C, and react with magnetic stirring for 6 hours at a magnetic stirring speed of 600rpm , filtered, and repeatedly washed with deionized water to obtain sodium alginate microspheres containing aldehyde groups on the surface;

[0064] (3) Then put the sodium alginate microspheres containing aldehyde groups on the surface into 100 mL hyperbranched polyamide solution with a concentratio...

Embodiment 3

[0071] (1) Add 1 g of sodium alginate powder into deionized water to prepare a 1 wt % sodium alginate solution. Then add 5wt% CaCl dropwise 2 In the solution, the mass-to-volume ratio of the two is 1:1.2, stirring while adding, the magnetic stirring speed is 800 rpm, cross-linking at room temperature for 7 hours, filtering, and repeated washing with deionized water to obtain sodium alginate microspheres;

[0072] (2) Then put sodium alginate microspheres into 100mL glutaraldehyde solution with a concentration of 0.2mol / L, add 2mL hydrochloric acid with a concentration of 1mol / L, keep the temperature at 60°C, and react with magnetic stirring for 6 hours at a magnetic stirring speed of 600rpm , filtered, and repeatedly washed with deionized water to obtain sodium alginate microspheres containing aldehyde groups on the surface;

[0073] (3) Then put sodium alginate microspheres containing aldehyde groups on the surface into 100mL hyperbranched polyamide solution with a concentra...

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Abstract

The invention discloses a hyperbranched polyamide modified sodium alginate microsphere for heavy metal ion adsorption and a preparation method thereof. The preparation method comprises the following steps: (1) adding a sodium alginate solution to a CaCl2 solution dropwise, stirring while adding and conducting crosslinking reaction; filtering and cleaning after the reaction is finished to obtain asodium alginate microsphere; (2) adding the sodium alginate microsphere to a glutaraldehyde solution, then adding hydrochloric acid to carry out aldehyde reaction and filtering and cleaning to obtainthe sodium alginate microsphere containing aldehyde groups on the surface; (3) adding the sodium alginate microsphere containing the aldehyde groups on the surface into a hyperbranched polyamide solution and filtering, cleaning and drying after the reaction to obtain the hyperbranched polyamide modified sodium alginate microsphere. According to the preparation method, a strategy of first balling of the sodium alginate and then grafting is adopted, so that the grafting groups can be completely exposed on the surface of the microsphere, and the utilization rate of the grafting groups is effectively increased.

Description

technical field [0001] The invention relates to a method for preparing a heavy metal ion adsorbent, in particular to a hyperbranched polyamide-modified sodium alginate microsphere used for heavy metal ion adsorption and a preparation method thereof. Background technique [0002] With the development of China's industry, more and more heavy metals are discharged into the environment, causing serious heavy metal pollution. Heavy metal ions are highly toxic, difficult to biodegrade, and can exist in the natural environment for a long time. At the same time, they can be continuously enriched in organisms through the food chain, which has brought serious harm to the natural environment and human health. Therefore, how to reduce heavy metal ion pollution and effectively recover heavy metal resources is an important issue facing society today. [0003] The adsorption method is widely used because of its advantages such as simple equipment, wide application range and good treatment...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/262B01J20/28021C02F1/288C02F2101/20
Inventor 王莉莉吴明华李恒余德游王炜王懿佳倪华刚
Owner ZHEJIANG SCI-TECH UNIV
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