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Preparation method of efficiently-adsorptive modified starch microspheres and application of modified starch microspheres

A technology of modified starch and starch microspheres, applied in chemical instruments and methods, adsorption water/sewage treatment, textile industry wastewater treatment, etc. Efficiency, increase adsorption active sites, increase the effect of force

Inactive Publication Date: 2014-06-18
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application of wastewater treatment, starch microspheres have two technical problems: (1) starch microspheres mainly rely on pore volume and specific surface area to perform physical adsorption, the adsorption reaction activity point is single, and the adsorption capacity of pollutants is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 100 g of starch to 140 ml of water, stir well, add 1.2 g of sodium chloride and 9.6 mL of epichlorohydrin, use NaOH solution to adjust the pH value to 11.0, stir for 16 hours, and then adjust the pH value with acetic acid When the temperature reached 6.0, let it stand for precipitation. The precipitate was washed twice with water, then washed four times with 70% alcohol, and finally filtered with suction. The solid matter was dried in an oven at 60°C to obtain starch microspheres.

[0024] (2) Mix 20 grams of urea, 2 mL of 85% phosphoric acid, and 2 grams of sodium citrate thoroughly, add 7 mL of ethanol, stir until the urea and sodium citrate are completely dissolved, then add 26 grams of starch microspheres, stir well, and place in a 650w Microwave for 5 minutes (every 10 seconds for 5 seconds), the product was washed 3 times with water, then 4 times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 70°C to obtain modifi...

Embodiment 2

[0028] (1) Add 100 g of starch to 150 ml of water, stir well, add 1.5 g of sodium chloride and 10 mL of epichlorohydrin, use NaOH solution to adjust the pH value to 12.0, stir for 15 hours, and then use acetic acid to adjust the pH value to 6.0, set aside to settle, the precipitate was washed 4 times with water, then washed 2 times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 70°C to obtain starch microspheres.

[0029] (2) Mix 20 grams of urea, 3 mL of 85% phosphoric acid, and 4 grams of sodium citrate thoroughly, add 8 mL of ethanol, stir until the urea and sodium citrate are completely dissolved, then add 35 grams of starch microspheres, stir evenly, and place in a 650w microwave oven Heating for 2 minutes (every 10 seconds for 5 seconds), the product was washed twice with water, then washed four times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 60°C to obtain modified starch microsp...

Embodiment 3

[0033] (1) Add 100 g of starch to 160 ml of water, stir well, add 1.8 g of sodium chloride and 13 mL of epichlorohydrin, use NaOH solution to adjust the pH value to 11.0, stir and react for 20 hours, and then use acetic acid to adjust the pH value to 6.0, set aside to settle, the precipitate was washed 3 times with water, then 3 times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 60°C to obtain starch microspheres.

[0034] (2) Mix 25 grams of urea, 3 mL of 85% phosphoric acid, and 1 gram of sodium citrate, add 12 mL of ethanol, stir until the urea and sodium citrate are completely dissolved, then add 44 grams of starch microspheres, stir evenly, and place in a 750w microwave oven Heating for 4 minutes (every 10 seconds of heating, intermittent 5 seconds), the product was washed 3 times with water, and then washed 4 times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 65°C to obtain modifie...

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Abstract

The invention discloses a preparation method of efficient-adsorption modified starch microspheres, adsorptive modified starch microspheres prepared by the method and an application method of the modified starch microspheres. According to the preparation method, starch, carbamide and phosphoric acid are synthesized at a certain reaction condition to obtain phosphoric acid-starch carbamate, thus greatly improving the adsorbing capacity; meanwhile, a urethane group is introduced, so that the water solubility of the phosphoric acid-starch carbamate is improved, thereby influencing the separation between the phosphoric acid-starch carbamate and a water solution. According to the preparation method, starch microspheres are prepared firstly, and then phosphoric acid-starch carbamate starch microspheres are prepared through a one-step method by taking the starch microspheres, carbamide, phosphoric acid and sodium citrate as raw materials. Due to the adoption of microsphere molecules, the adsorbing capacity is greatly improved. The modified starch microspheres prepared by the method is especially applicable to adsorption treatment of printing and dyeing wastewater.

Description

technical field [0001] The invention relates to a preparation method and application of high-efficiency adsorptive modified starch microspheres, belonging to the technical field of preparation of water treatment agents. The modified starch microspheres prepared by the invention are especially suitable for the adsorption treatment of printing and dyeing wastewater. Background technique [0002] While printing and dyeing has become an important industry for my country's export earnings, it has also become one of the industries with high energy consumption and high pollution. On average, it needs to consume 0.2 to 0.5 m 3 The printing and dyeing wastewater contains dyes, pastes, additives, acids, alkalis, fiber impurities and inorganic salts, etc., which are extremely chromatic and difficult to handle. Especially in recent years, the stability of the dye structure has been greatly improved, further increasing the difficulty of decolorization. The methods of treating dye waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F103/30
Inventor 林亲铁潘建新赵健鄂
Owner GUANGDONG UNIV OF TECH
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