Preparation of an amidoxime-modified magnetic nano-biosorbent and its method for adsorbing low-concentration uranium
A biosorbent and magnetic nanotechnology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of low recycling rate, high production cost, and low adsorption efficiency, and achieve adsorption Stable effect, high adsorption rate, stable effect of adsorption rate change
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[0038] The preparation of the adsorbent provided by the invention and the specific steps of adsorbing low-concentration uranium are:
[0039] (1) Weigh 6.8 g FeCl 3 ·6H 2 O in a Erlenmeyer flask, add 400 ml of ethylene glycol solution, stir for 15 minutes to obtain an orange-yellow clear liquid, add 18 g of anhydrous sodium acetate and 5 g of trisodium citrate, continue stirring for 1 h, and pour the solution into high temperature In the reaction kettle, react at 200 °C for 10 h, cool to room temperature naturally, wash with distilled water and ethanol several times, and dry in vacuum at 50 °C for 24 h to obtain nano-Fe 3 o 4 ;
[0040] (2) Take 1 g nanometer Fe 3 o 4 Add 50 ml of toluene solution to the Erlenmeyer flask, after ultrasonication for 20 min, add 1.34 ml of (2-cyanoethyl) triethoxysilane, react at 100 °C for 48 h under the condition of nitrogen gas, and wash with ethanol for several times , dried under vacuum at 50°C for 24h to obtain nano-Fe modified with c...
Embodiment 2
[0051] Example 2, respectively pipette 20 mL of uranium solution with an initial concentration of 10 mg / L in a 50 mL Erlenmeyer flask, and adjust the pH value of the solution in turn to 2, 3, 4, 5, 6, 7, 8, 9, in three formulas parts, add 0.010 g magnetic nano Fe 3 o 4- Aspergillus niger biosorbent / 0.010 g of the adsorbent provided by the patent of the present invention, oscillating and adsorbing in a constant temperature culture shaker with a rotation speed of 150 rpm at 25 °C, counting from the time when the adsorbent is added to the solution, oscillating and adsorbing for 300 min, and measuring the residual concentration of uranium. When the pH is 2-9, the magnetic nano-Fe 3 o 4 -The adsorption rate of Aspergillus niger biosorbent is 19.17%, 21.61%, 33.33%, 50.85%, 61.83%, 76.36%, 53.18%, 22.92%; the adsorption rate of ANFAN is 5.04%, 7.5%, 39.04%, 78.89%, 10.5%, 7.39%, 6.76%. It can be seen that the magnetic nano-Fe 3 o 4 - The Aspergillus niger biosorbent reaches a...
Embodiment 3
[0052] Example 3, respectively pipetting 20 mL of uranium solution with an initial concentration of 10 mg / L in a 50 mL Erlenmeyer flask, adjusting its pH=7 (magnetic nanometer Fe 3 o 4 -Aspergillus niger biosorbent) / pH=5 (the adsorbent provided by the patent of the present invention), add 0.010 g magnetic nano-Fe respectively 3 o 4 - Aspergillus niger biosorbent / 0.010 g of the adsorbent provided by the patent of the present invention, in triplicate. The adsorption was oscillated in a constant temperature culture shaker with a rotation speed of 150 rpm, and the timing was started from the time when the adsorbent was added to the solution. The oscillating adsorption was 300 min, and the temperature of the shaker was adjusted to 15°C, 25°C, 35°C, 45°C, and 55°C, respectively. Determine the concentration of residual uranium in the solution. Magnetic nano-Fe 3 o 4 -The adsorption rate of Aspergillus niger biosorbent is 70.16%, 74.06%, 81.2%, 83.15%, 84.4%; 89.65%. Magnetic n...
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