Magnetic bionic adsorbent and application of magnetic bionic adsorbent in treating acid wastewater containing uranium

An adsorbent and magnetic technology, applied in the field of magnetic biomimetic adsorbent and its application in the treatment of acidic uranium-containing wastewater, can solve the problems of large organic solvent consumption, long preparation cycle of magnetic uranium adsorbent, secondary pollution cost, etc. , to achieve the effect of good hydrophilicity, simple and novel preparation process, and strong adsorption capacity

Active Publication Date: 2016-03-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of similar work are that the preparation period of magnetic uranium adsorbent is long, and a large amount of organic solvent is consumed, which is easy to cause secondary pollution and high cost

Method used

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  • Magnetic bionic adsorbent and application of magnetic bionic adsorbent in treating acid wastewater containing uranium
  • Magnetic bionic adsorbent and application of magnetic bionic adsorbent in treating acid wastewater containing uranium
  • Magnetic bionic adsorbent and application of magnetic bionic adsorbent in treating acid wastewater containing uranium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A kind of rapid synthesis method of magnetic biomimetic adsorbent

[0029] (1) Add 1.00g PSSMA to 40mL of ethylene glycol, heat and stir until dissolved; add 1.08g ferric chloride hexahydrate and 3.00g anhydrous sodium acetate in sequence at room temperature, continue stirring and dissolving for 1h, then transfer to 200mL In the tetrafluoroethylene reaction kettle, heated at 200 ° C for 10 h, took out the reaction kettle, cooled overnight, and poured out the prepared Fe from the kettle. 3 O 4 The microspheres were washed alternately with ethanol and deionized water for 4 to 5 times, and dried in vacuum at 35 °C for 12 h to obtain Fe 3 O 4 magnetic nanoparticles;

[0030] (2) prepare a tris(hydroxymethyl)aminomethane buffer solution, the solvent is an ethanol / water mixed solution with a volume ratio of 1:1, and adjust pH=8.5 with a 0.5mol / L hydrochloric acid solution; at 25°C, step (1) Fe produced in 3 O 40.1 g of magnetic nanoparticles was dispersed ...

Embodiment 2

[0033] Example 2: Application of Magnetic Biomimetic Adsorbent in Treatment of Acidic Uranium-Containing Wastewater

[0034] Pipette 25mL of uranium solution with a concentration of 100mg / L into a conical flask, use 1mol / LHNO 3 Or 1 mol / L NaOH solution to adjust its pH to 3.0, add 0.05 g of the magnetic biomimetic adsorbent obtained in Example 1, ultrasonicate for 10 min, and shake at 240 r / min for 72 h in a constant temperature air bath at 25 ± 0.2 °C. After separating the adsorbent with a magnet, take out the supernatant sample, add 1 mol / L tartaric acid buffer solution, hydroxylamine hydrochloride-urea solution and arsenic azo III indicator to the water sample to be tested in turn and make up the volume, and determine by spectrophotometry According to the mass concentration of uranium in the solution, the removal rate of uranium by the adsorbent was calculated according to the adsorption equilibrium formula E=8.1%.

Embodiment 3

[0035] Example 3: Application of Magnetic Biomimetic Adsorbent in Treatment of Acidic Uranium-Containing Wastewater

[0036] Pipette 25mL of uranium solution with a concentration of 100mg / L into a conical flask, use 1mol / LHNO 3 Or 1 mol / L NaOH solution to adjust its pH to 3.5, add 0.05 g of the magnetic biomimetic adsorbent obtained in Example 1, ultrasonicate for 10 min, and shake at 240 r / min for 72 h in a constant temperature air bath at 25 ± 0.2 °C. After separating the adsorbent with a magnet, take out the supernatant sample, add 1 mol / L tartaric acid buffer solution, hydroxylamine hydrochloride-urea solution and arsenic azo III indicator to the water sample to be tested in turn and make up the volume, and determine by spectrophotometry According to the mass concentration of uranium in the solution, the removal rate of uranium by the adsorbent was calculated according to the adsorption equilibrium formula E=22.3%.

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Abstract

The invention relates to a magnetic bionic adsorbent and an application of the magnetic bionic adsorbent in treating acid wastewater containing uranium. A solvothermal method for preparing Fe3O4 by taking PSSMA (poly (4-styrene sulfonate-copolymer-maleic acid) sodium salt) as a surfactant is improved, grain sizes are uniform, and Fe3O4 magnetic nanoparticles can be synthesized on a large scale; biomolecule dopamine is polymerized in a trihydroxymethyl aminomethane buffer system and coats the surfaces of the Fe3O4 magnetic nanoparticles, and the novel magnetic bionic adsorbent with a core-shell structure is established. The magnetic bionic adsorbent has excellent hydrophilicity and larger specific surface area due to the the polydopamine structure of a shell layer, rich functional groups on the surface of the magnetic bionic adsorbent have high uranium adsorption capacity in a wider acidity range, the magnetic bionic adsorbent has higher uranium adsorption capacity and good selectivity, and uranium adsorbed on the surface of the adsorbent can be easily washed with a 0.1 mol/L (NH4)2CO3 solution and can be recycled conveniently.

Description

technical field [0001] The invention belongs to the technical field of uranium-containing wastewater treatment, in particular to a magnetic biomimetic adsorbent and its application in the treatment of acidic uranium-containing wastewater. Background technique [0002] In recent years, with the increasingly serious problems of fossil energy and environment, nuclear energy, as a new type of energy with high energy density, clean and low carbon, has received unprecedented attention and developed rapidly. Among them, uranium, as an important strategic resource, is of great significance to the development of national defense, agriculture, medicine, electric power and other fields. However, in the process of uranium ore smelting and spent fuel reprocessing, a large amount of uranium-containing waste liquid is inevitably accumulated. Due to the chemical toxicity of uranium and the effect of internal exposure, it constitutes a potential radioactivity to human activities and the biol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/26B01J20/28009C02F1/285C02F2101/006C02F2101/20
Inventor 吴奉承叶钢陈靖易荣
Owner TSINGHUA UNIV
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