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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Problems solved by technology

However, the preparation of sodium alginate microspheres is difficult, mainly because calcium chloride

Method used

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  • Method for sodium alginate microsphere adsorbent through emulsion polymerization process

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Example Embodiment

[0021] Example 1

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

[0023] (2) Mix the obtained solution with 6 g of calcium carbonate powder, and stir for 15 minutes with an electric stirrer at 400 rpm. Then add 100 mL of paraffin oil and 2 mL of Span 85 emulsifier, and continue to stir for 20 minutes.

[0024] (3) Add 10 mL of glacial acetic acid to the prepared emulsion, and keep the rotating speed for 30 min. Finally, add 200 mL of deionized water and let stand for 24 hours. The obtained microsphere-like solid is washed repeatedly with ethanol and deionized water to obtain the microsphere adsorbent with sodium alginate as the raw material (the scanning electron microscope image is as figure 1 Shown).

Example Embodiment

[0025] Example 2

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

[0027] (2) Mix the obtained solution with 8 g of calcium carbonate powder, and stir for 15 minutes with an electric stirrer at 600 rpm. Then add 100 mL of paraffin oil and 3 mL of Span 85 emulsifier, and continue to stir for 20 minutes.

[0028] (3) Add 15 mL of glacial acetic acid to the prepared emulsion, and keep the rotating speed for 30 min. Finally, add 200 mL of deionized water and let stand for 24 hours. The obtained microsphere-like solid is repeatedly washed with ethanol and deionized water to obtain a microsphere adsorbent using sodium alginate as a raw material.

Example Embodiment

[0029] Example 3

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

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

[0032] (3) Add 15 mL of glacial acetic acid to the prepared emulsion, and keep the rotating speed for 30 min. Finally, add 200 mL of deionized water and let stand for 24 hours. The obtained microsphere-like solid is repeatedly washed with ethanol and deionized water to obtain a microsphere adsorbent using sodium alginate as a 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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