Polyamidoxime-based chelating resin for extracting uranium from seawater and preparation method thereof
A chelating resin, polyamidoxime technology, applied in the field of new adsorption materials, can solve the problems of inability to guarantee complete conversion of nitrile groups, limited introduction of amidoxime groups, low adsorption performance, etc., and achieves fast adsorption speed and selectivity. Strong, high adsorption effect
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Synthetic example
[0032] Dissolve 3.45 g of hydroxylamine hydrochloride and 1.68 g of sodium bicarbonate in 50 mL of methanol, then slowly add 0.645 mL of 4-cyanostyrene, protect the system with argon, heat and stir under reflux for 6 h. After the reaction, it was extracted twice with ethyl acetate, spin-dried, washed out with n-hexane, and suction filtered to obtain the product p-amidoxime styrene.
[0033] Add 1 g of p-amidoxime styrene, 0.5 g of ethylene glycol dimethacrylate and 0.08 g of azobisisobutyronitrile into 5 mL of organic solvent, stir at 25 °C for 1 h, add the above solution Put it in a hydrothermal reaction kettle, react at 100 °C for 24 h, take it out, open the kettle, remove the organic solvent by rotary evaporation, and dry it in vacuum at 45 °C for 24 h to obtain polyamidoxime-based chelating resin P-1.
Embodiment 2
[0035] Polyamidoxime-based chelating resins can be prepared by solvothermal method. As a typical synthetic example:
[0036] Dissolve 3.45 g of hydroxylamine hydrochloride and 1.68 g of sodium bicarbonate in 50 mL of methanol, then slowly add 0.645 mL of 4-cyanostyrene, protect the system with argon, heat and stir under reflux for 6 h. After the reaction, it was extracted twice with ethyl acetate, spin-dried, washed out with n-hexane, and suction filtered to obtain the product p-amidoxime styrene.
[0037]Add 1 g of p-amidoxime styrene, 0.2 g of ethylene glycol dimethacrylate and 0.08 g of azobisisobutyronitrile into 5 mL of organic solvent, stir at 25 °C for 1 h, add the above solution Put it in a hydrothermal reaction kettle, react at 100°C for 24 hours, take it out, open the kettle, remove the organic solvent by rotary evaporation, and dry it in vacuum at 45°C for 24 hours to obtain polyamidoxime-based chelating resin P-2.
Embodiment 3
[0039] Accurately pipette 400 mL, 7.56 mg / L uranium standard solution into a 500 mL Erlenmeyer flask, adjust the pH value of the solution with 12 mol / L nitric acid, 1 mol / L NaOH solution and 5 mol / L NaOH solution, so that the solution The pH is 8.3. Add 0.003 g of adsorbent P-1, and adsorb on a constant temperature oscillator at 25 °C and 98 r / min for 3 h. After separation by filtration, the concentration of uranium ions in the filtrate was measured by Arsenazo III spectrophotometry, and the adsorption amount at this time was calculated to be 650 mg / g combined with formula (1).
[0040] The adsorption amount of uranium ions was calculated according to the following formula:
[0041] (1)
[0042] In the formula: q e —Adsorption capacity, mg / g; V—volume of uranium solution, L; C e —Equilibrium concentration of uranium ion solution, mg / L; C 0 —Initial concentration of uranium ion solution, mg / L; m—mass of adsorbent, g.
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