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A magnetic nano functional material for extracting uranium from seawater and its preparation method
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A magnetic nanometer and functional material technology, applied in seawater treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of easy agglomeration and sedimentation, low stability, low adsorption capacity, etc., and achieve stable and durable pH. Range, good biological resistance, good magnetic properties
Active Publication Date: 2022-04-12
LANZHOU UNIVERSITY
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[0005] Aiming at the problems of easy agglomeration and sedimentation caused by using magnetic nanoparticles as the adsorbent, and the problems of low adsorption capacity and low stability of the existing composite nano-adsorbent, the present invention researches and develops a , easy solid-liquid / solid-solid separation, high adsorption capacity (q max pH6.5=350mg / L) magnetic nano-functional material, and it can be used for the purification of uranium-containing wastewater and the extraction of uranium in simulated seawater, with high specific selectivity, biological resistance and stability
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Embodiment 1
[0036] Method for preparing magnetic nanofunctional materials for seawater undergraduate, including the following steps:
[0037] Step 1: Talking with sodium of hexahydride and dihydrate citrate is dissolved in ethylene glycol, then anhydrous acetate is added thereto, and the sodium hexahydride, sodium chloride, sodium bicyclic citrate is controlled. The molar ratio was 3: 1: 16, which was heated and stirred, and the mixture was refluxed at 70 ° C and stirred for 30-60 minutes, and the reaction was transferred to the reaction kettle for 8 to 12 hours, and the reaction was naturally cooled to room temperature. Magnetic separation, washing, drying, gave magnetic Fe 3 O 4 Particle;
[0038] Step 2: Take magnetic Fe 3 O 4 The particles are dispersed in a mixed solution A of ethanol, water and ammonia, and the volume ratio of ethanol, water and ammonia is 75: 5: 4, and the concentration of ammonia is 28 wt.%, Control Fe 3 O 4 After the mass concentration is 3 g / L, after the ultrasoun...
Embodiment 2
[0044] FE 3 O 4 @ S-TIO 2 The preparation method of-AO is the same as in Example 1. Among them, the volume ratio of ethanol, water and ammonia water in the mixed solution A is 85: 5: 4, and the concentration of ammonia is 28 wt.%; Silicate tetraethyl The volume ratio of ethanol is 1:90. In step three, the volume ratio of ethanol and ammonia water in the mixed solution B is 250: 1. In step four, the reaction temperature of the high temperature furnace in the autoclave was set to 150 ° C for 24 hours. In step five, the addition of the crosslinking agent N, N'-methylene bisacrylamide and potassium sulfate is 8% of the total mass of the reactants in step five. The remaining substances are the same as in Example 1.
Embodiment 3
[0046] FE 3 O 4 @ S-TIO 2 The preparation method of-AO is the same as in Example 1, wherein the volume ratio of ethanol, water and ammonia water in the mixed solution A is 90: 5: 4, and the concentration of ammonia is 28 wt.%; Tetraethyl silicate The volume ratio of ethanol is 1: 180. In step three, the volume ratio of ethanol and ammonia in the mixed solution B is 1000: 3. In step four, the reaction temperature of the high temperature furnace in the autoclave was set to 200 ° C for 16 hours. In step 5, the addition of the crosslinking agent N, N'-methylene bisacrylamide and potassium sulfate is 10% of the total quality of the reactants in the step 5. The remaining substances are the same as in Example 1.
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Abstract
The invention discloses a magnetic nano functional material for extracting uranium from seawater and a preparation method thereof, comprising the following steps: Step 1: reacting ferric chloride hexahydrate and trisodium citrate dihydrate to obtain Fe 3 o 4 Particles; Step 2: Composite reaction to prepare Fe 3 o 4 @SiO 2 Particles; Step 3: Fe 3 o 4 @SiO 2 Disperse in a mixed solution composed of ethanol and ammonia water, add titanium isopropoxide, and react to obtain Fe 3 o 4 @SiO 2 @TiO 2 Particles; Step 4: Fe 3 o 4 @SiO 2 @TiO 2 Dispersed in NaOH solution, calcined after reaction to obtain Fe with developed surface 3 o 4 @s‑TiO 2 particles; step five: Fe 3 o 4 @s‑TiO 2 Disperse in acetic acid, add a cross-linking agent, and react in an oil bath to obtain cyanated Fe 3 o 4 @s‑TiO 2 ‑CN particles; Step 6: Fe 3 o 4 @s‑TiO 2 ‑CN is dispersed in a mixed solution of methanol and water, adding hydroxylamine hydrochloride, adjusting the pH of the solution to 7, and reacting in an oil bath to obtain amidoximated Fe 3 o 4 @s‑TiO 2 ‑AO particles. Fe prepared by the present invention 3 o 4 @s‑TiO 2 ‑AO material has a well-developed surface, good magnetic properties, stability and durability, and good biological resistance. It has excellent adsorption selectivity for uranium, and can be used for the removal of uranium in uranium-containing water bodies and the extraction of uranium from seawater.
Description
Technical field [0001] The present invention relates to the technical field of nanomaterials, and more particularly to magnetic nano-functional materials for seawater disruption and preparation methods. Background technique [0002] Uranium resources are the basic resources of nuclear industry, which is the strategic resources of national nuclear energy development. In the context of current nuclear energy development, the guarantee problem of nuclear fuel uranium has been highlighted. my country has proven to have about 200,000 tons of uranium resource reserves, ranking 10th world, but as the world's first population big country, my country's demand for energy is large, but there are fewer per capita costs. Therefore, development and utilization of unconventional uranium resources is conducive to ensuring sustainable development and energy security of nuclear energy in my country. There are about 1.37 × 10 in the world's ocean. 12 m 3 The average concentration of uranium in seaw...
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