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Preparation method of nano zero-valent iron loaded porous carbon composite material uranium adsorbent

A technology of nano-zero-valent iron and composite materials, applied in chemical instruments and methods, other chemical processes, nuclear engineering, etc., can solve the problems of poor adsorption effect and low adsorption rate, increase stability and specific surface area, improve Adsorption rate, effect of preventing agglomeration

Pending Publication Date: 2021-11-26
BEIJING RES INST OF CHEM ENG & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a method for preparing a porous carbon composite material uranium adsorbent supported by nanometer zero-valent iron. The technical problem to be solved by the present invention is: in the prior art, the porous carbon Materials and nano zero-valent iron, low adsorption rate, poor adsorption effect

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  • Preparation method of nano zero-valent iron loaded porous carbon composite material uranium adsorbent

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Embodiment 1

[0023] The invention provides a method for preparing a porous carbon composite uranium adsorbent loaded with nanometer zero-valent iron. The preparation method comprises the following steps:

[0024] S1: Mix 12ml of styrene and 320ml of deionized water and heat to 70°C. In an atmosphere of argon as a protective gas, add 10ml of 0.3M potassium persulfate aqueous solution, stir at 60rpm and keep at 70°C for 28h. A white emulsion was formed, and the emulsion was centrifugally filtered, washed three times with deionized water and ethanol, and dried at 30°C for 4 hours to obtain white powdery polystyrene microspheres;

[0025] S2: Disperse 20g of dried polystyrene microspheres in 300ml of isopropanol solution, stir at 80rpm for 3h, then add 4g of titanium tetraisopropoxide and 2g of terephthalic acid, continue to stir at the same speed for 4h, at 70°C Drying at 600°C for 2h in a tube furnace in an atmosphere of nitrogen as a protective gas, with a heating rate of 2°C / min, to obtain...

Embodiment 2

[0028] The invention provides a method for preparing a porous carbon composite uranium adsorbent loaded with nanometer zero-valent iron. The preparation method comprises the following steps:

[0029] S1: Mix 12ml of styrene and 320ml of deionized water and heat to 70°C. In an atmosphere of argon as a protective gas, add 10ml of 0.3M potassium persulfate aqueous solution, stir at 60rpm and keep at 70°C for 28h. A white emulsion was formed, and the emulsion was centrifugally filtered, washed three times with deionized water and ethanol, and dried at 30°C for 4 hours to obtain white powdery polystyrene microspheres;

[0030] S2: Disperse 20g of dried polystyrene microspheres in 300ml of isopropanol solution, stir at 80rpm for 3h, then add 4g of titanium tetraisopropoxide and 2g of terephthalic acid, continue to stir at the same speed for 4h, at 70°C Drying at 600°C for 2h in a tube furnace in an atmosphere of nitrogen as a protective gas, with a heating rate of 2°C / min, to obtain...

Embodiment 3

[0033] The invention provides a method for preparing a porous carbon composite uranium adsorbent loaded with nanometer zero-valent iron. The preparation method comprises the following steps:

[0034] S1: Mix 12ml of styrene and 320ml of deionized water and heat to 70°C. In an atmosphere of argon as a protective gas, add 10ml of 0.3M potassium persulfate aqueous solution, stir at 60rpm and keep at 70°C for 28h. A white emulsion was formed, and the emulsion was centrifugally filtered, washed three times with deionized water and ethanol, and dried at 30°C for 4 hours to obtain white powdery polystyrene microspheres;

[0035] S2: Disperse 20 g of dried polystyrene microspheres in 300 ml of isopropanol solution, stir at 80 rpm for 3 h, add 4 g of titanium tetraisopropoxide and 2 g of terephthalic acid, continue stirring at the same speed for 4 h, and Drying at 600°C for 2h in a tube furnace in an atmosphere of nitrogen as a protective gas, with a heating rate of 2°C / min, to obtain ...

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Abstract

The invention discloses a preparation method of a nano zero-valent iron loaded porous carbon composite material uranium adsorbent, and belongs to the field of uranium adsorbents. According to the preparation method of the invention, FeSO4. 7H2O or FeCl3. 6H2O is used as an iron source, sodium borohydride or potassium borohydride is used as a reducing agent, polyvinylpyrrolidone is used as a stabilizer, and a porous carbon composite material obtained by calcining a metal organic framework synthesized by a polystyrene microsphere template at a high temperature is used as a carrier, the active nano zero-valent iron loaded porous carbon composite material with a porous structure is synthesized by a liquid phase reduction method; when the composite material adsorbent prepared by the method is used for treating uranium-containing radioactive wastewater, for the uranium-containing wastewater with the initial concentration of 0.45 mg / L, when the pH is 5 and the input amount of the adsorbent is 9 mg, the uranium adsorption rate of the composite material adsorbent can reach 99.71% within 35 minutes.

Description

technical field [0001] The invention relates to the technical field of uranium adsorbent, more specifically, the invention relates to a method for preparing a porous carbon composite material uranium adsorbent loaded with nanometer zero-valent iron. Background technique [0002] Uranium is an important nuclear power fuel and strategic material, used in scientific research, medicine, national defense, industrial isotope and other production fields. However, in the production of uranium mining and metallurgy, a large amount of low-concentration uranium-containing wastewater will be produced, which seriously threatens the natural environment and life safety. Uranium is a radioactive heavy metal element that emits alpha rays, is difficult to degrade, and can cause serious consequences such as canceration and distortion in the human body. Uranium-containing radioactive wastewater must be treated to meet the standard before it can be discharged. Therefore, seeking suitable and ef...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30G21F9/12
CPCB01J20/02B01J20/20G21F9/12
Inventor 刘啸尘牛洁邢慧敏李存增王扬
Owner BEIJING RES INST OF CHEM ENG & METALLURGY
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