Magnetic polystyrene-base chitosan compound adsorbent and preparation method and application thereof

A polystyrene-based, composite adsorption technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problem of reducing the content of active adsorption functional groups of modified chitosan, affecting the modified Chitosan adsorption performance, reducing adsorption capacity and other issues, to achieve the effect of easy industrial expansion of production, good recycling performance, and large adsorption capacity

Inactive Publication Date: 2017-08-22
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the interaction between the cross-linking agent and the amino groups in chitosan molecules, the above-mentioned patented technology will consume a large amount of amino groups contained in chitosan itself, reducing the content of active adsorption functional groups of chitosan after modification, which also greatly affects the modification. After the adsorption properties of chitosan, the adsorption capacity was reduced

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  • Magnetic polystyrene-base chitosan compound adsorbent and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take a 250mL four-necked flask, add 90mL of deionized water to it, and pass nitrogen protection at room temperature (to remove the oxygen in the water body), then weigh 10g of styrene monomer and 1.0g of acrylic acid monomer and add them to the deionized water. After stirring for about 10 minutes, weigh 100mg of potassium persulfate and dissolve it in 5mL of deionized water, add it to the above solution, raise the temperature to about 75°C, use mechanical stirring at a speed of 140-150rpm, and continue the reaction for 20h to terminate the reaction. Centrifuge the obtained carboxylated polystyrene microsphere solution at 12,000 rpm for more than 35 minutes, then wash with water, sonicate, and centrifuge again, repeat three times, and finally dry in a 60°C oven to obtain a white solid.

[0033] Magnetic carboxylated polystyrene composite microspheres were prepared by co-precipitating Fe 3 o 4 Nanoparticles evenly cover the surface of polystyrene microspheres. The exper...

Embodiment 2

[0038] The preparation method of magnetic polystyrene-based chitosan composite adsorbent specifically comprises the following steps:

[0039] Step (1): Add styrene monomer and acrylic acid monomer into deionized water, stir and mix, then add persulfate aqueous solution, raise the temperature to 65°C, stir and react for 20 hours, then centrifuge to retain the solid matter, and then After washing with water, ultrasonication, and drying, a white solid was obtained, that is, carboxylated polystyrene microspheres;

[0040] Step (2): ultrasonically disperse the carboxylated polystyrene microspheres prepared in step (1) in deionized water to form an emulsion, protect it with an inert gas, place it in an ice-water bath, and then add dissolved FeCl 3 ·6H 2 O and FeCl 2 4H 2 O aqueous solution, keep stirring for 1 hour, remove the ice-water bath, and then place it in a water bath at 85°C to observe the color change of the emulsion. After the color of the emulsion turns dark yellow, a...

Embodiment 3

[0054] The preparation method of magnetic polystyrene-based chitosan composite adsorbent specifically comprises the following steps:

[0055] Step (1): Add styrene monomer and acrylic acid monomer into deionized water, stir and mix, then add persulfate aqueous solution, heat up to 76°C, stir and react for 12 hours, then centrifuge to retain solid matter, and then After washing with water, ultrasonication, and drying, a white solid was obtained, that is, carboxylated polystyrene microspheres;

[0056] Step (2): ultrasonically disperse the carboxylated polystyrene microspheres prepared in step (1) in deionized water to form an emulsion, protect it with an inert gas, place it in an ice-water bath, and then add dissolved FeCl 3 ·6H 2 O and FeCl 2 4H 2 O aqueous solution, keep stirring for 0.5 hours, remove the ice-water bath, and then place it in a water bath at 80°C to observe the color change of the emulsion. After the color of the emulsion turns dark yellow, add ammonia wate...

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Abstract

The invention relates to a magnetic polystyrene-base chitosan compound adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: preparing a substrate material: polystyrene PS, then linking Fe3O4 onto the surfaces of polystyrene microspheres by a coprecipitation method so that the compound microspheres become magnetic, then coating the outer layer of PS / Fe3O4 with a layer of cross-linked chitosan, finally conducting chemical modification on PS / Fe3O4 / CS, and linking polyethylene imine onto the surface of the material so that the surface of the compound material contains a large number of amino and imino groups. The prepared compound adsorbent is used for adsorbing heavy metal ions in a water body. Compared with the prior art, the compound adsorbent disclosed by the invention has the common characteristics of rapid adsorption kinetics, magnetic recovery and high adsorption capacity (abundant functional groups on the surface), and has rapid adsorption property on heavy metals and good self-recycling performance.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a magnetic polystyrene-based chitosan composite adsorbent and its preparation method and application, in particular to an aminated modified magnetic polystyrene-based chitosan composite adsorption Agents and their preparation methods and applications. Background technique [0002] With the development of my country's industry, all kinds of heavy metal sewage are discharged into water bodies, resulting in increasingly serious heavy metal pollution in water bodies. Heavy metal pollution has the characteristics of easy accumulation, irreversibility, and long duration. Migrate and transform each other and are therefore difficult to remove. Common heavy metals in industrial production include copper, cadmium, chromium, lead, etc. When their concentration in the human body is higher than a certain value, they will show high toxicity and have adverse effects on health, leading to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28009C02F1/286C02F2101/20
Inventor 任兰芳肖长委刘锡建陆杰
Owner SHANGHAI UNIV OF ENG SCI
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