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Method for sodium alginate microsphere adsorbent through emulsion polymerization process

A technology of emulsion polymerization and sodium alginate, which is applied in the field of preparation of porous adsorbents, can solve the problems of difficult application of emulsion polymerization and preparation of sodium alginate microspheres, etc., and achieves high adsorption capacity, good industrial application prospects, and is not easy to short circuit Effect

Inactive Publication Date: 2019-02-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of sodium alginate microspheres is difficult, mainly because calcium chloride solution can be dissolved in the water phase, which is difficult to apply in emulsion polymerization.

Method used

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  • Method for sodium alginate microsphere adsorbent through emulsion polymerization process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) First, mix 10 mL of carbon disulfide and 250 mL of 14% sodium hydroxide solution, then add 5 g of sodium alginate, and keep stirring at 30° C. for 24 hours.

[0023] (2) The obtained solution was mixed with 6 g of calcium carbonate powder, and stirred at 400 rpm for 15 min with an electric stirrer. Then add 100mL paraffin oil and 2mL Span 85 emulsifier, and continue stirring for 20min.

[0024] (3) Add 10 mL of glacial acetic acid to the prepared emulsion, and keep stirring for 30 min at a rotating speed. Finally, 200 mL of deionized water was added and allowed to stand for 24 h. The obtained microspherical solid is washed repeatedly with ethanol and deionized water to obtain the microspherical adsorbent of sodium alginate as raw material (its scanning electron microscope picture is as follows: figure 1 shown).

Embodiment 2

[0026] (1) First, mix 10 mL of carbon disulfide and 250 mL of 14% sodium hydroxide solution, then add 8 g of sodium alginate, and keep stirring at 30° C. for 24 hours.

[0027] (2) The obtained solution was mixed with 8 g of calcium carbonate powder, and stirred at 600 rpm for 15 min with an electric stirrer. Then add 100mL paraffin oil and 3mL Span 85 emulsifier, and continue stirring for 20min.

[0028] (3) Add 15 mL of glacial acetic acid to the prepared emulsion, and keep stirring for 30 min at a rotating speed. Finally, 200 mL of deionized water was added and allowed to stand for 24 h. The obtained microspherical solid is repeatedly washed with ethanol and deionized water to obtain the microspherical adsorbent with sodium alginate as the raw material.

Embodiment 3

[0030] (1) First, mix 10 mL of carbon disulfide and 250 mL of 14% sodium hydroxide solution, then add 10 g of sodium alginate, and keep stirring at 30° C. for 24 hours.

[0031] (2) Mix the obtained solution with 10 g of calcium carbonate powder, and stir for 15 min at 800 rpm with an electric stirrer. Then add 100mL paraffin oil and 4mL Span 85 emulsifier, and continue stirring for 20min.

[0032] (3) Add 15 mL of glacial acetic acid to the prepared emulsion, and keep stirring for 30 min at a rotating speed. Finally, 200 mL of deionized water was added and allowed to stand for 24 h. The obtained microspherical solid is repeatedly washed with ethanol and deionized water to obtain the microspherical adsorbent with sodium alginate as the raw material.

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Abstract

The invention discloses a method for a sodium alginate microsphere adsorbent through an emulsion polymerization process and belongs to the technical field of metal ion adsorption. The method includes:sufficiently mixing chemically modified sodium alginate solution, calcium carbonate, paroline and Span 85 surfactant to form an emulsion, adding glacial acetic acid to release calcium ions, and generating sodium alginate microspheres during high-speed stirring. The sodium alginate microspheres different in grain size and narrow in grain size distribution can be prepared by adjusting agent consumption and stirring condition. Compared with conventional adsorbents taking sodium alginate as a raw material, the microsphere adsorbent prepared by the method has the advantages of uniform size, high mechanical strength and high selective adsorptivity. The microsphere adsorbent has high selectivity to heavy metal in acidic conditions, has high selectivity to heavy metal in acidic to neutral conditions and can be successfully filled and applied in a fixed bed adsorption column, thereby having good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of metal ion adsorption, and in particular relates to a preparation method of a porous adsorbent using sodium alginate as a raw material. Background technique [0002] Adsorbents using sodium alginate as raw material are research hotspots of biomass adsorption materials, but currently common adsorbents made of sodium alginate as raw material are mostly in the form of powder or hydrogel. Among them, because the particles of the powdered adsorbent are too fine, the pressure drop will be too large when it is actually used in the adsorption column, resulting in blockage. Hydrogel-like adsorbents are generally prepared by dropping sodium alginate solution into calcium chloride solution. The diameter is generally more than 1mm. The large size results in a small specific surface area and a relatively low adsorption capacity. At this time, the microspherical adsorbent can take into account both shape and performan...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/24B01J20/30B01D15/08C02F1/28C02F101/20
CPCB01D15/08B01J20/24B01J20/28021C02F1/286C02F2101/20
Inventor 高翔鹏辛藜莉何晓春高志芳雷鹰李明阳
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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