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Preparation method of modified starch for wastewater treatment

A wastewater treatment and modification technology, applied in the field of starch, can solve the problems of non-toxic and harmless, affecting human health, secondary pollution of the treatment residue environment, etc., and achieve the effect of non-toxic and harmless environment

Active Publication Date: 2016-02-24
内蒙古世杰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention: aiming at the problem that most of the artificially synthesized organic and inorganic water treatment agents are slightly toxic and will enter the human body through the food chain, affecting human health, or the treatment residue will cause secondary pollution to the environment, provide A modified starch is used as a water treatment agent modified by natural high molecular carbohydrates. The present invention uses a mixed solution of potassium hydroxide / urea, disodium oxyphosphate-citric acid buffer solution, cross-linking agent, Modified starch with carbon disulfide, etc., is used to act on starch, which is easy to precipitate and has the effect of replacing metal ions. It can be used to remove copper, chromium, zinc and many other heavy metal ions in industrial wastewater, which can be recycled. Heavy metals, non-toxic and harmless to the environment, will not cause secondary pollution to the environment

Method used

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Examples

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example 1

[0018] First, add 60g of potassium hydroxide and 40g of urea to a 500mL beaker, add 250mL of deionized water to it, stir until the solids are completely dissolved, and prepare a mixed solution of potassium hydroxide / urea; weigh 100g of potato powder, add Add 50mL of deionized water, mix well to make starch milk, put it into a 500mL three-neck flask, put it in a water bath at 60°C, add the mixed solution prepared above into the bottle, and use a magnetic stirrer at 200r / min Stir at a rotating speed until a uniform starch paste is formed, then add dropwise 6% hydrochloric acid to the bottle to adjust the pH to 7, continue stirring for 20 minutes, take out the reactant and wash it twice with distilled water, then wash it with absolute ethanol Wash twice, place in an oven at 50°C for 1 hour; take 60g of the dried solid in a 500mL reaction bottle, add 100mL of disodium oxyphosphate-citric acid buffer solution with a pH value of 6.0, and place in a 50°C oven Stir in a water bath for...

example 2

[0021]First, add 65g of potassium hydroxide and 45g of urea to a 500mL beaker, add 275mL of deionized water to it, stir until the solids are completely dissolved, and prepare a mixed solution of potassium hydroxide / urea; weigh 125g of potato powder, add Add 75mL deionized water, mix well to make starch milk, put it into a 500mL three-necked flask, put it in a water bath at 65°C, add the above-mentioned mixed solution into the bottle, and use a magnetic stirrer at 225r / min Stir at a rotating speed until a uniform starch paste is formed, then add dropwise 6% hydrochloric acid to the bottle to adjust the pH to 7, continue stirring for 25 minutes, take out the reactant and wash it twice with distilled water, and then wash it with absolute ethanol Wash twice, place in an oven at 55°C to dry for 1.5h; take 70g of the dried solid in a 500mL reaction bottle, add 110mL of disodium oxyphosphate-citric acid buffer solution with a pH value of 6.3, and place at 53°C Stir in a water bath fo...

example 3

[0024] First, add 70g of potassium hydroxide and 50g of urea to a 500mL beaker, add 300mL of deionized water to it, stir until the solids are completely dissolved, and prepare a mixed solution of potassium hydroxide / urea; weigh 150g of potato powder, add Add 80mL of deionized water, mix well to make starch milk, put it into a 500mL three-neck flask, put it in a water bath at 70°C, add the mixed solution prepared above into the bottle, and use a magnetic stirrer at 250r / min Stir at a rotating speed until a uniform starch paste is formed, then add dropwise 6% hydrochloric acid to the bottle to adjust the pH to 7, continue to stir for 30 minutes, take out the reactant and wash it with distilled water for 3 times, then wash it with absolute ethanol Wash 3 times, place in an oven at 60°C for 2 hours; take 80g of the dried solid in a 500mL reaction bottle, add 120mL of disodium oxyphosphate-citric acid buffer solution with a pH value of 6.5, and place in a 55°C Stir in a water bath ...

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Abstract

The invention discloses a preparation method of modified starch for wastewater treatment, and belongs to the field of starch. According to the preparation method, a water treatment agent is provided through modification with the modified starch as a natural high-molecular carbohydrate; the modified starch is obtained by modifying potato starch by utilizing a potassium hydroxide and urea mixed solution, a disodium phosphate oxygen and citric acid buffer solution, a cross linking agent; carbon bisulfide and the like; carbon bisulfide is utilized for acting on the starch, so that precipitation is easy; the modified starch has an efficiency of metal ion displacement, so as to remove copper, chromium, zinc, and lots of heavy metal ions in the industrial wastewater; not only can heavy metals be recovered, but also the modified starch is nontoxic and harmless to environments, and is free of secondary pollution to the environments.

Description

technical field [0001] The invention discloses a method for preparing modified starch for wastewater treatment, which belongs to the field of starch. Background technique [0002] Industries such as leather, electroplating, mining and metallurgy discharge a large amount of wastewater containing heavy metal ions, especially wastewater containing chromium ions. Wastewater containing heavy metals pollutes the environment, destroys the ecological balance, affects the growth of animals and plants, and seriously endangers human health. With the development of industry, more and more heavy metals are lost from industrial wastewater, resulting in [0003] A great waste of resources. On the other hand, with the in-depth study of heavy metal toxicology and the development of detection technology, the treatment standards of heavy metal waste are becoming increasingly strict. Therefore, scholars at home and abroad are actively exploring and researching an efficient method for removin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/52C02F1/28B01J20/30B01J20/24
CPCB01J20/24B01J20/3085B01J2220/4825C02F1/286C02F1/42C02F1/5263C02F1/56C02F2101/20C02F2101/22C02F2305/04
Inventor 梅庆波王志慧
Owner 内蒙古世杰化工有限公司
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