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Three-dimensional nano-iron oxide, its gel in-situ preparation method and its application

A three-dimensional nano, iron oxide technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, iron oxides, etc., can solve the problems of difficult solid-liquid separation, easy agglomeration of powder products, etc. Liquid separation, excellent adsorption performance and catalytic performance, shape controllable effect

Active Publication Date: 2020-05-19
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, three-dimensional nano-iron oxides have higher specific surface area and active sites due to their ordered hierarchical structure, while traditional three-dimensional nano-iron oxides (nanorods, nanowires, nanosheets, nanoflowers, sea urchin balls, etc.) The addition of toxic organic templates is required in the preparation, and the obtained powder product is easy to agglomerate, and it is not easy to separate solid and liquid when used in water treatment

Method used

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  • Three-dimensional nano-iron oxide, its gel in-situ preparation method and its application
  • Three-dimensional nano-iron oxide, its gel in-situ preparation method and its application
  • Three-dimensional nano-iron oxide, its gel in-situ preparation method and its application

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preparation example Construction

[0020] Specifically, the preparation method of the three-dimensional nano-iron oxide of the present invention comprises the following steps:

[0021] Step 1, dissolving a water-soluble polymer, preferably polyvinyl alcohol, gelatin, agar, etc., more preferably polyvinyl alcohol, and iron salt in water to obtain a mixed solution;

[0022] Step 2, heating the mixed solution obtained in step 1 to obtain ordered and graded nano-iron oxides grown in situ by water-soluble polymer templates;

[0023] In step 3, the product obtained in step 2 is repeatedly frozen and thawed to obtain a three-dimensional nano-iron oxide composite gel grown in situ with a water-soluble polymer template.

[0024] In the above preparation method, the concentrations of the water-soluble polymer and the iron salt in step 1 are respectively 5-200 mg / mL and 0.01-200 mol / mL, preferably 100 mg / mL and 0.1 mol / L.

[0025] In the above preparation method, the iron salt in step 1 is a soluble ferrous salt, such as...

Embodiment 1

[0032] In this example, the double network gel is prepared by one-step green method, and the specific preparation steps are as follows:

[0033] Prepare a mixed solution of polyvinyl alcohol and ferrous sulfate. The concentration of polyvinyl alcohol in the mixed solution is 100 mg / mL, and the molar concentration of ferrous sulfate is 0.1 mol / L. Stir to form a uniform solution. Put the mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, heat it at 120°C for 12h, put the heated product into a mold, put it in a refrigerator and freeze it at -40°C for 12h, take it out and thaw it to room temperature, After repeated freezing-thawing three times, the three-dimensional nano-iron oxide grown in situ and fixed in gel can be obtained. The adsorption or catalytic degradation efficiency of the product for tetracycline with an initial concentration of 100 mg / mL in water can be higher than 99%. The optical photograph of the product is as figure 1 As shown...

Embodiment 2

[0035] Prepare a mixed solution of polyvinyl alcohol and ferrous sulfate. The concentration of polyvinyl alcohol in the mixed solution is 200 mg / mL, and the molar concentration of ferrous sulfate is 0.1 mol / L. Stir to form a uniform solution. Put the mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, heat it at 180°C for 12h, put the heated product into a mold, put it in a refrigerator and freeze it at -40°C for 12h, take it out and thaw it to room temperature, After repeated freezing-thawing three times, the three-dimensional nano-iron oxide grown in situ and fixed in gel can be obtained. According to XRD analysis, the type of iron oxide formed is α-Fe 2 o 3 .

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Abstract

The invention discloses 3D nano iron oxide as well as an in-situ preparation method and an application of the 3D nano iron oxide gel. The preparation method comprises the steps as follows: a water-soluble polymer and iron salt are dissolved in water, and a mixed liquor is obtained; the mixed liquor is heated, and nano iron oxide which grows in situ and is graded orderly is obtained; the product isrepeatedly frozen and thawed, and 3D nano iron oxide composite gel which grows in situ and is fixed through gelling is obtained. The template action of water-soluble polymers such as polyvinyl alcohol is used for controlling iron oxide to grow in polyvinyl alcohol in situ, polyvinyl alcohol can form gel with a freezing-thawing method to further fix and disperse the iron oxide, agglomeration of the iron oxide can be inhibited fundamentally, the problem of difficulty in solid-liquid separation in water treatment of iron oxide powder is solved, the preparation method is simple and efficient, theobtained gel is uniform, porous and controllable in shape, has excellent adsorption property and catalytic performance, is prone to solid-liquid separation and has broad application prospects in environmental pollution control.

Description

technical field [0001] The invention belongs to the research field of environmental functional materials, and in particular relates to a three-dimensional nanometer iron oxide, its gel in-situ preparation method and its application. Background technique [0002] Iron(hydr)oxides have attracted extensive attention due to their excellent adsorption properties, catalytic properties, and good environmental compatibility. Among them, three-dimensional nano-iron oxides have higher specific surface area and active sites due to their ordered hierarchical structure, while traditional three-dimensional nano-iron oxides (nanorods, nanowires, nanosheets, nanoflowers, sea urchin balls, etc.) The addition of toxic organic template is required in the preparation, and the obtained powder product is easy to agglomerate, and it is not easy to separate solid and liquid when used in water treatment. Contents of the invention [0003] In view of this, the main purpose of the present invention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J32/00B01J23/745B01J20/28C01G49/06C01G49/02
CPCB01J20/06B01J20/28047B01J23/745C01G49/02C01G49/06C01P2002/72C01P2004/03C01P2004/30
Inventor 庄媛石宝友孔岩
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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