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A magnetic biomimetic adsorbent and its application in the treatment of acidic uranium-containing wastewater

An adsorbent and magnetic technology, applied in 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 period of magnetic uranium adsorbent, secondary pollution cost, etc. , to achieve the effects of good hydrophilicity, simple and novel preparation process, and strong adsorption capacity

Active Publication Date: 2018-08-28
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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  • A magnetic biomimetic adsorbent and its application in the treatment of acidic uranium-containing wastewater
  • A magnetic biomimetic adsorbent and its application in the treatment of acidic uranium-containing wastewater
  • A magnetic biomimetic adsorbent and its application in the treatment of acidic uranium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: A rapid synthesis method of a magnetic biomimetic adsorbent

[0029] (1) Add 1.00g of PSSMA to 40mL of ethylene glycol, heat and stir until dissolved; add 1.08g of ferric chloride hexahydrate and 3.00g of anhydrous sodium acetate successively at room temperature, continue stirring and dissolving for 1 hour, and transfer to In a 200mL tetrafluoroethylene reactor, heat the reaction at 200°C for 10h, take out the reactor, cool it overnight, pour out the prepared Fe 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 hours to obtain Fe 3 o 4 magnetic nanoparticles;

[0030] (2) Tris buffer solution is prepared, the solvent is an ethanol / water mixed solution with a volume ratio of 1:1, and the pH=8.5 is adjusted with 0.5mol / L hydrochloric acid solution; at 25°C, the step (1) Fe obtained from 3 o 4Disperse 0.1 g of magnetic nanoparticles in 90 mL of buffer solution, sonicate for ...

Embodiment 2

[0033] Example 2: Application of magnetic biomimetic adsorbent in the treatment of acidic uranium-containing wastewater

[0034] Pipette 25mL of uranium solution with a concentration of 100mg / L into a conical flask, add 1mol / L HNO 3 Or 1mol / L NaOH solution to adjust its pH to 3.0, add 0.05g of the magnetic biomimetic adsorbent obtained in Example 1, after ultrasonication for 10min, vibrate at 240r / min for 72h 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 azoarsenic III indicator to the water sample to be tested in sequence, and make it constant to volume, then measure it by spectrophotometry The mass concentration of uranium in the solution is calculated according to the adsorption equilibrium formula, and the removal rate of uranium by the adsorbent is 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, add 1mol / L HNO 3 Or 1mol / L NaOH solution to adjust its pH to 3.5, add 0.05g of the magnetic biomimetic adsorbent obtained in Example 1, after ultrasonication for 10min, vibrate at 240r / min for 72h 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 azoarsenic III indicator to the water sample to be tested in sequence, and make it constant to volume, then measure it by spectrophotometry The mass concentration of uranium in the solution is calculated according to the adsorption equilibrium formula, and the removal rate of uranium by the adsorbent is 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 treating acidic uranium-containing wastewater. Background technique [0002] In recent years, with the increasingly serious problems of fossil energy and the 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 many fields such as national defense, agriculture, medicine, and electric power. However, in the process of uranium ore smelting and spent fuel reprocessing, a large amount of uranium-containing waste liquid inevitably accumulates. Due to the chemical toxicity of uranium and the effect of internal radiation, it poses a potential radioactive hazard to human activities and the biol...

Claims

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Application Information

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Patent Type & Authority Patents(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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