A silicon-coated carbonized nitrogen-containing carbon-based adsorption material capable of well adsorbing radionuclide uranium and its application method
A technology of radionuclide and adsorption materials, which is applied in the field of silicon-coated carbonized nitrogen-containing carbon-based adsorption materials, can solve the problems of limited adsorption capacity and single adsorption performance, and achieve smooth surface, uniform particle size and stable valence state. Effect
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Embodiment 1
[0019] Example 1: Preparation of silicon-coated carbonized nitrogen-containing carbon-based adsorption material:
[0020] After the glucose and tetraethylenepentamine are dissolved, mix them in a molar ratio of 5:1 and put them into a reactor, seal them and put them in an oven at 170-190°C for 15-24 hours of reaction. The reacted object was washed with deionized water and absolute ethanol until the solution was colorless and transparent, then dried in an oven at 80° C. and sealed in a glass sample bottle to obtain the nitrogen-containing carbon-based adsorption material. Take 500 mg of amino-modified carbon spheres, 150 mL of absolute ethanol, 500 μL of water, and 150 μL of ammonia water in a single-necked round-bottomed flask, adjust the pH to 7-8, and gradually add tetraethyl orthosilicate to a total of 10 mL. Carry out on the stirrer, the rotating speed is 500r / min. The silicon-coated product was centrifugally filtered and dried at 80° C. to obtain a nitrogen-containing / si...
Embodiment 2
[0023]Example 2: Effect of solution pH on the adsorption performance of silicon-coated carbonized nitrogen-containing carbon-based adsorbent material:
[0024] Use 0.1mol / L hydrochloric acid solution and 0.1mol / L sodium hydroxide solution to adjust the pH to 2-6, add 10mg nitrogen-containing carbon-based adsorption materials to 1mL uranyl ion solution with an initial concentration of 1mg / L , ultrasonic 30min, static adsorption 4h. Then centrifuge at 4000r / min for 10min, take the supernatant and measure the concentration Ce of uranyl ion in the solution after adsorption with a trace uranium analyzer. Calculate the adsorption amount Q (mg / g).
[0025] The pH value of the solution has a great influence on the adsorption of trace uranium, which not only affects the form and content of uranium in the solution, but also affects the adsorption performance of the adsorption material. At low pH, the solubility product of uranyl ions is larger, and uranyl ions in the solution can exis...
Embodiment 3
[0026] Example 3: Effect of adsorption time on adsorption capacity of silicon-coated carbonized nitrogen-containing carbon-based adsorption material:
[0027] The adsorption performance of silicon-coated carbonized nitrogen-containing carbon-based adsorbent materials was adjusted to pH 5 with 0.1mol / L hydrochloric acid solution and 0.1mol / L sodium hydroxide solution, and in 200mL uranyl ion solution with an initial concentration of 50mg / L , add 50 mg of adsorbent, take samples at intervals to test the uranyl ion concentration Ce of the solution after adsorption, and calculate the adsorption amount Q (mg / g).
[0028] Such as image 3 As shown, the adsorption is very fast at the beginning, because there are many adsorption active sites on the adsorbent at the beginning, and it also shows that the force between the adsorption sites and uranium ions is very strong. As the adsorption progresses, the active sites As the sites are occupied by uranyl ions and decrease, the adsorption...
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