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Preparation of a 2-thiouracil-modified porous magnetic xanthan gum microsphere

A technology of thiouracil and xanthan gum, applied in the field of environment and chemistry, can solve the problems of difficult solid-liquid separation of adsorbents, hinder the progress of adsorption technology, etc., and achieve good physical and chemical stability, excellent mechanical strength, and good adsorption selection. Effect

Inactive Publication Date: 2019-01-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, there are many shortcomings in the adsorption method. The difficulty of solid-liquid separation of the adsorbent has always been a major problem hindering the progress of adsorption technology. Therefore, in recent years, many scholars have devoted themselves to the study of magnetic adsorbents and applied them in adsorption separation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Organic phase preparation: In the reactor, add silicone oil: 81 mL, diethylenetriamine: 18 g, polyethylene glycol: 4 g, and stir well to form the organic phase;

[0027] (2) Water phase preparation: In the reactor, add deionized water: 80 mL, xanthan gum: 17 g, nano-Fe 3 o 4 Magnetic particles: 2g, sodium hydroxide: 1.0g, ultrasonically dispersed, it is the water phase;

[0028] (3) Preparation of porous magnetic xanthan gum microspheres: In the reactor, at room temperature, under stirring at a speed of 3000 rpm, spray 100 mL of the aqueous phase of step (2) into 100 mL of step (1) In the organic phase, stir and react for 1h, the temperature rises to 70±2°C, continue to react for 20min, cool to room temperature, separate the solid and liquid, soak the solid phase in deionized water for 24h, place it in a plastic container and freeze it at -18°C for 4h , put it into a freeze-drying box after taking it out, and freeze-dry it for 24 hours to obtain porous magnetic xa...

Embodiment 2

[0031] (1) Organic phase preparation: In the reactor, add silicone oil: 75mL, diethylenetriamine: 22g, polyethylene glycol: 3g, stir well, and it becomes the organic phase;

[0032] (2) Water phase preparation: In the reactor, add deionized water: 75 mL, xanthan gum: 20 g, nano-Fe 3 o 4 Magnetic particles: 3g, sodium hydroxide: 2g, ultrasonically dispersed, in water phase;

[0033] (3) Preparation of porous magnetic xanthan gum microspheres: In the reactor, at room temperature, under stirring at a speed of 3000 rpm, spray 100 mL of the aqueous phase of step (2) into 80 mL of step (1) In the organic phase, stir and react for 1h, the temperature rises to 70±2°C, continue to react for 20min, cool to room temperature, separate the solid and liquid, soak the solid phase in deionized water for 24h, place it in a plastic container and freeze it at -18°C for 4h , put it into a freeze-drying box after taking it out, and freeze-dry it for 24 hours to obtain porous magnetic xanthan gum...

Embodiment 3

[0036] (1) Organic phase preparation: In the reactor, add silicone oil: 83mL, diethylenetriamine: 14g, polyethylene glycol: 6g, stir well, and it becomes the organic phase;

[0037] (2) Water phase preparation: In the reactor, add deionized water: 82mL, xanthan gum: 14g, nano-Fe 3 o 4 Magnetic particles: 3.5g, sodium hydroxide: 0.5g, ultrasonically dispersed, in water phase;

[0038] (3) Preparation of porous magnetic xanthan gum microspheres: In the reactor, at room temperature, under stirring at a speed of 3000 rpm, spray 100 mL of the aqueous phase of step (2) into 120 mL of step (1) In the organic phase, stir and react for 1h, the temperature rises to 70±2°C, continue to react for 20min, cool to room temperature, separate the solid and liquid, soak the solid phase in deionized water for 24h, place it in a plastic container and freeze it at -18°C for 4h , put it into a freeze-drying box after taking it out, and freeze-dry it for 24 hours to obtain porous magnetic xanthan ...

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Abstract

The invention discloses a preparation method of 2-thiouracil modified porous magnetic xanthan gum micro-spheres. The preparation method is characterized by including the steps: taking silicone oil as an organic phase, taking xanthan gum and nano-Fe3O4 magnetic particles as a water phase, spraying the water phase into the organic phase under the indoor temperature, separating solid and liquid, soaking a solid phase by the aid of deionized water for 24 hours, rapidly freezing soaked solid phase in a plastic container for 4 hours at the temperature of 18 DEG C below zero, placing the freezed solid phase into a freezing and drying oven after taking out, and freezing and drying the solid phase for 24 hours to obtain the porous magnetic xanthan gum micro-spheres; sequentially adding components into a reactor in weight percentage, dissolving 76-82% of N,N-dimethyl amide and 3-6% of 2-thiouracil, adding 10-16% of porous magnetic xanthan gum micro-spheres, stirring mixture, dripping 2.5-5% of Fumaryl chloride, performing reflux reaction for 2-3h at the temperature ranging from 48 DEG C to 52 DEG C, separating solid and liquid, and drying the separated solid to obtain the2-thiouracil modified porous magnetic xanthan gum micro-spheres. An adsorbent has high adsorption capacity for silver, can be repeatedly used and is low in cost, green and environmentally friendly, and the adsorbent has magnetism, so that the adsorbent is easily separated.

Description

technical field [0001] The invention relates to the technical field of a preparation method of a biosorbent, in particular to a preparation method of 2-thiouracil-modified porous magnetic xanthan gum microspheres and an application technology for silver adsorption, belonging to the field of environment and chemistry technology . Background technique [0002] Due to the needs of industrial development and life, many heavy metals are discharged into the atmosphere and water, endangering the ecological environment and human health. The wide application of silver and silver-containing products in the fields of electronic electroplating, photosensitive materials, chemical industry and scientific research has produced a large amount of Silver-containing waste liquid not only causes serious environmental pollution, but also causes a large waste of silver resources. Therefore, the removal and recovery of silver in waste liquid containing silver ions has very important research and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J13/02B01J20/30C02F1/28C02F101/20
CPCB01J13/02B01J20/06B01J20/22B01J20/24B01J20/28009B01J20/28021B01J2220/46B01J2220/4806B01J2220/4812B01J2220/4825C02F1/28C02F1/281C02F1/286C02F2101/20
Inventor 李慧芝李晓峰杨秋苹
Owner UNIV OF JINAN
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