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Amino-modified magnetic rice husk biochar preparation method and method for adsorbing uranium in water by using biochar

A technology of amino modification and biochar, which is applied in the field of environmental engineering, can solve the problems of high pyrolysis temperature and difficulty in actual operation, and achieve the effects of increasing specific surface area, facilitating recovery, and good adsorption effect

Inactive Publication Date: 2019-04-05
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

CN106378094A discloses a preparation method of amino-loaded iron composite modified biochar, which has a good adsorption effect on copper in water, but the pyrolysis temperature is high in the preparation process, the pH needs to be adjusted, and the actual control of obtaining zero-valent iron load is difficult , the above poses challenges to the stability and preparation cost of biochar
At present, there is still a lack of research on the development and application of biochar materials for U(VI) adsorption in water, and based on some existing research and patents, it is urgent to find a simple preparation process, a wide range of raw materials, easy access to solvents or substances for preparation, and low cost. , Modified biochar with strong adsorption performance on U(VI) and recyclability

Method used

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  • Amino-modified magnetic rice husk biochar preparation method and method for adsorbing uranium in water by using biochar
  • Amino-modified magnetic rice husk biochar preparation method and method for adsorbing uranium in water by using biochar
  • Amino-modified magnetic rice husk biochar preparation method and method for adsorbing uranium in water by using biochar

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preparation example Construction

[0025] Specifically, an amino-modified magnetic rice husk biochar is prepared by the following method:

[0026] A. Wash the collected rice husks with ultrapure water, and dry them in a drying oven to constant weight for later use.

[0027] B. Put the rice husk into the flat-bottomed porcelain shaft and put it into the tube furnace, heat at 5°C min -1 charging N 2 (2mL min -1 ) under the condition of heating to 500°C and keeping it for 2 hours, the pyrolysis product was washed with ultrapure water to remove ash, and then dried in a vacuum oven. After natural cooling, it was ground and sieved, and stored in a brown reagent bottle. Rice husk biochar (BC).

[0028]C. Under the condition of an ice-water bath, slowly add concentrated sulfuric acid and concentrated nitric acid into the round bottom flask and keep stirring. After stirring for 5 minutes, add the BC obtained in step B and continue stirring for 2 hours, then cool to room temperature and suction filter. Wash with etha...

Embodiment 1

[0038] Example 1: Preparation and application of amino-modified magnetic rice husk biochar

[0039] A. Wash the collected rice husks with ultrapure water, and dry them in a drying oven to constant weight for later use.

[0040] B. Put the rice husk into the flat-bottomed porcelain shaft and put it into the tube furnace, heat at 5°C min -1 charging N 2 (2mL min -1 ) under the condition of heating to 500°C and keeping it for 2 hours, the pyrolysis product was washed with ultrapure water to remove ash, and then dried in a vacuum oven. After natural cooling, it was ground and sieved, and stored in a brown reagent bottle. Rice husk biochar (BC).

[0041] C. Under the condition of an ice-water bath, slowly add concentrated sulfuric acid and concentrated nitric acid into the round bottom flask and keep stirring. After stirring for 5 minutes, add the BC obtained in step B and continue stirring for 2 hours, then cool to room temperature and suction filter. Wash with ethanol repeate...

Embodiment 2

[0044] Example 2: Preparation and application of amino-modified magnetic rice husk biochar

[0045] A. Wash the collected rice husks with ultrapure water, and dry them in a drying oven to constant weight for later use.

[0046] B. Put the rice husk into the flat-bottomed porcelain shaft and put it into the tube furnace, heat at 5°C min -1 charging N 2 (2mL min -1 ) under the condition of heating to 500°C and keeping it for 2 hours, the pyrolysis product was washed with ultrapure water to remove ash, and then dried in a vacuum oven. After natural cooling, it was ground and sieved, and stored in a brown reagent bottle. Rice husk biochar (BC).

[0047] C. Under the condition of an ice-water bath, slowly add concentrated sulfuric acid and concentrated nitric acid into the round bottom flask and keep stirring. After stirring for 5 minutes, add the BC obtained in step B and continue stirring for 2 hours, then cool to room temperature and suction filter. Wash with ethanol repeate...

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Abstract

The invention discloses an amino-modified magnetic rice husk biochar preparation method and a method for adsorbing uranium in water by using the biochar, and belongs to the field of environmental engineering. The preparation method includes taking a rice husk as a raw material, heating the husk to 500 DEG C for pyrolysis at 5 DEG C min-1 under the condition of introducing nitrogen; washing the husk with ultra-pure water to remove ash, drying, grinding and sieving to obtain rice husk biochar; fully mixing with concentrated sulfuric acid and concentrated nitric acid under the condition of ice-water bath; cooling a reactant to room temperature for suction filtration; washing with the ultra-pure water and ethanol to neutrality; adding ammonia water and an ultra-pure water mixed solution; adding sodium thiosulfate for stirring; adding glacial acetic acid for heating to 80 DEG C and heating for reflux; preforming suction filtration; washing with the ultra-pure water and the ethanol to neutrality; drying to obtain the amino-modified biochar; and mixing and reacting with Fe3O4 particles according to a mass ratio of 2: 1 at 80 DEG C to finally obtain the amino-modified magnetic biochar. Theamino-modified magnetic rice husk biochar prepared by the method has the advantages of wide raw material sources, obvious cost benefits, and convenience for recycling and reuse, so that the biochar is suitable for treating uranium-containing waste water.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to the preparation of amino-modified magnetic rice husk biochar and a method for using it to reduce uranium in water bodies. Background technique [0002] As a kind of green energy, nuclear energy has been widely concerned and used by countries all over the world. Among them, the development and utilization of uranium mines with U(VI) (uranium) as the main nuclear fuel are becoming more and more frequent. According to statistics, the current output of nuclear uranium mines in the world is as high as more than 20 billion Ton. However, a large amount of U(VI)-containing wastewater will be generated during the development, smelting and use of U(VI). Because uranium is radioactive and difficult to degrade, it directly poses a potential threat to the ecological environment and human health. Effective disposal of U(VI) wastewater is urgent and necessary. [0003] Ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30G21F9/12
CPCB01J20/24B01J20/28009B01J20/28057B01J20/28069B01J2220/4825G21F9/12
Inventor 郭伟史江红刘庆伟张梦涛王淑娟
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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