Method for preparing nanometer zero-valent iron with modified graphene oxide as carrier

A nano-zero-valent iron and graphene technology, applied in the field of nanomaterials, can solve the problems of corrosion equipment, difficult to recover nano-zero-valent iron, easy to agglomerate, etc., to achieve the effect of improving the removal rate, simple raw materials, and improving water solubility

Inactive Publication Date: 2015-04-22
张一梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing nano-zero-valent iron still has many limitations in practical applications, mainly reflected in: the high activity of nano-zero-valent iron, which will react with oxygen and water in water, thereby reducing the removal rate of target pollutants; The activity of zero-valent iron increases under acidic conditions, but acidic conditions will corrode equipment in practical applications;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] (1) Weigh 1g ferrous sulfate and 3g sodium borohydride and grind them in a mortar for 10 minutes to obtain a solid phase medium;

[0026] (2) Take 10g of tea polyphenols, 1g of agar, and 3g of water-soluble starch and dissolve them in 30ml of water as the liquid phase medium;

[0027] (3) Add the liquid phase medium to the solid phase medium, stir evenly to prepare a rheological phase; react at 20°C for 2 hours, wash the reaction product with absolute ethanol three times to prepare the wrapped nano zero-valent iron, and place it in a vacuum oven Dry for later use.

[0028] (4) Dissolve graphene oxide in ethanol to form a mixture of 2-4 mg / L, take 100 parts by mass of the above mixture, add 10 parts by mass of polyacrylate to it, stir for 5-10 minutes, add 10 parts by mass Parts of ethylene glycol butyl ether, after stirring for 5-10 minutes, add 5 parts by mass of polyoxyethylene octyl phenyl ether, after stirring for 5-10 minutes, add 10 parts by mass of a...

Example Embodiment

[0031] Example 2:

[0032] (1) Weigh 1g ferrous sulfate and 4g sodium borohydride and grind in a mortar for 10 minutes to obtain a solid phase medium;

[0033] (2) Take 10g of tea polyphenols, 1g of agar, and 3g of water-soluble starch and dissolve them in 30ml of water as the liquid phase medium;

[0034] (3) Add the liquid phase medium to the solid phase medium, stir evenly to prepare a rheological phase; react at 20°C for 2 hours, wash the reaction product with absolute ethanol three times to prepare the wrapped nano zero-valent iron, and place it in a vacuum oven Dry for later use.

[0035] (4) Dissolve graphene oxide in ethanol to form a mixture of 2-4 mg / L, take 100 parts by mass of the above mixture, add 10 parts by mass of polyacrylate to it, stir for 5-10 minutes, add 10 parts by mass Parts of ethylene glycol butyl ether, after stirring for 5-10 minutes, add 5 parts by mass of polyoxyethylene octyl phenyl ether, after stirring for 5-10 minutes, add 10 parts by mass of alkyl ...

Example Embodiment

[0038] Example 3:

[0039] (1) Weigh 1g ferrous sulfate and 3g sodium borohydride and grind them in a mortar for 10 minutes to obtain a solid phase medium;

[0040] (2) Take 10g of tea polyphenols, 1g of agar, and 3g of water-soluble starch and dissolve them in 30ml of water as the liquid phase medium;

[0041] (3) Add the liquid phase medium to the solid phase medium, stir evenly to prepare a rheological phase; react at 20°C for 2 hours, wash the reaction product with absolute ethanol three times to prepare the wrapped nano zero-valent iron, and place it in a vacuum oven Dry for later use.

[0042] (4) Dissolve graphene oxide in ethanol to form a mixture of 2-4 mg / L, take 100 parts by mass of the above mixture, add 10 parts by mass of polyacrylate to it, stir for 5-10 minutes, add 10 parts by mass Parts of ethylene glycol butyl ether, after stirring for 5-10 minutes, add 5 parts by mass of polyoxyethylene octyl phenyl ether, after stirring for 5-10 minutes, add 10 parts by mass of a...

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PUM

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Abstract

The invention discloses a method for preparing wrapped nanometer zero-valent iron with modified graphene oxide as a carrier. The method comprises the following steps that firstly, wrapped nanometer zero-valent iron is prepared; secondly, graphene oxide is modified; thirdly, the obtained modified graphene oxide is added to water, graphene oxide suspension liquid is obtained after ultrasonic dispersion is conducted for one to three hours, then the obtained wrapped nanometer zero-valent iron is added to the graphene oxide suspension liquid, filtering, washing and drying are conducted after stirring is conducted sufficiently, and then the wrapped nanometer zero-valent iron adsorbent with the modified graphene oxide as the carrier is obtained. According to the method, cheap and harmless tea polyphenol, agar and water soluble starch are taken as the surface modifier to prepare the wrapped nanometer zero-valent iron, and the target pollutant removal rate is increased; the surface of the graphene oxide is modified by means of covalent bonds, the maximum Cr6+ absorption capacity of the modified graphene oxide is 390 mg/g, and the absorption capacity is greatly improved by one to two times.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a method for preparing encapsulated nanometer zero-valent iron with modified graphene oxide as a carrier. Background technique [0002] Due to its strong reducing ability and cheap and easy-to-obtain raw materials, nano-zero-valent iron is not easy to cause secondary pollution during use, and it can efficiently remove pollutants in sediment or water, such as halogenated organic compounds, nitroaromatic compounds, and heavy metal ions. It has great application prospects in the field of wastewater treatment. [0003] In the Chinese Invention Patent Application Publication No. 201110211774.5, a method for preparing nano-zero-valent iron based on the liquid-phase complexation reduction method is disclosed. The soluble ferrous salt and the complexing agent sulfosalicylic acid are dissolved in water to adjust the pH value of the solution. 5 to 7 to form a complexed ferrous solution;...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J20/28009C02F1/288
Inventor 张一梅
Owner 张一梅
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