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
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[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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