Method for preparing calixarene-modified magnetic nano-adsorbent and adsorbing low-concentration uranium with calixarene-modified magnetic nano-adsorbent

A magnetic nanometer and adsorbent technology, applied in chemical instruments and methods, radioactive purification, other chemical processes, etc., can solve the problems of complicated processing technology, high production cost, high processing cost, and achieve good adsorption effect and stable adsorption effect. , the effect of high adsorption rate

Inactive Publication Date: 2017-08-18
NANHUA UNIV
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Problems solved by technology

At present, domestic methods for treating low-level radioactive wastewater mainly include chemical precipitation, extraction, ion exchange, redox, flocculation, membrane separation, freezing, and neutron combustion. Good treatment effect, but there are still many shortcomings in the actual application process, such as cumbersome and complicated treatment process, high treatment cost, high energy consumption, low selective removal rate of uranium, large amount of mud, easy to cause secondary pollution, etc., and the treatment The target is mainly high-concentration uranium-containing wastewater, and the treatment effect on low-concentration uranium is not good, and the treatment cost is high
The adsorption method is widely used in the research on the treatment of low-concentration uranium-containing wastewater because of its simple process, high uranium removal efficiency, safety and environmental protection, and has obtained many research results. However, the adsorption method also has high production costs and low concentration. Low uranium adsorption efficiency, low recycling rate and other defects, therefore, the preparation of cheap, safe and efficient uranium adsorbent is a work of great significance

Method used

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  • Method for preparing calixarene-modified magnetic nano-adsorbent and adsorbing low-concentration uranium with calixarene-modified magnetic nano-adsorbent
  • Method for preparing calixarene-modified magnetic nano-adsorbent and adsorbing low-concentration uranium with calixarene-modified magnetic nano-adsorbent
  • Method for preparing calixarene-modified magnetic nano-adsorbent and adsorbing low-concentration uranium with calixarene-modified magnetic nano-adsorbent

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specific Embodiment approach

[0029] The preparation of the adsorbent provided by the invention and the specific steps of adsorbing low-concentration uranium are:

[0030] (1) FeCl with a molar ratio of 1:2 2 4H 2 O and FeCl 3 ·6H 2 O weighed and placed in a beaker to dissolve, then pour the solution into a three-necked flask, add a certain amount of distilled water dissolved in a certain amount of 4-sulfonylcalix[6]arene hydrate, stir quickly and evenly, and stir at 60°C for a certain period of time, Adjust the pH to 11 with 1mol / L NaOH solution, raise the temperature to 80°C, and stir for a certain period of time under the protection of nitrogen. After crystallization at room temperature, it was washed several times with distilled water.

[0031] (2) dry. The product obtained in step (1) was vacuum-dried at 50°C for 24 hours to obtain 4-sulfonylcalix[6]arene-modified Fe 3 o 4 Magnetic material adsorbent-MFS.

[0032] (3) Grind the product obtained in step (2) into powder, put it into a clean plas...

Embodiment 1

[0034] IV Example 1 The preparation of the adsorbent provided by the patent of the present invention:

[0035] (1) Fe 3 o 4 Preparation of Magnetic Materials

[0036] FeCl 2 4H 2 O and FeCl 3 ·6H 2 O is weighed in a molar ratio of 1:2 and placed in a beaker for dissolution, then the solution is poured into a three-necked flask, stirred evenly, stirred at 60°C for a certain period of time, and adjusted to pH 11 with 1mol / L NaOH solution. The temperature was raised to 80°C, and the reaction was stirred for a certain period of time under the protection of nitrogen. After crystallization at room temperature, it was washed several times with distilled water, and dried in a vacuum oven at 50°C for 24 hours. The obtained product was ground into powder, put into a clean plastic centrifuge tube, and stored in a refrigerator.

[0037] (2) 4-sulfonylcalix[6]arene-modified magnetic nano-Fe 3 o 4 --Preparation of MFS

[0038] FeCl 2 4H 2 O and FeCl 3 ·6H 2 O is weighed and pl...

Embodiment 2

[0039] Example 2, pipette 100 mL of uranium solution with an initial concentration of 2.5 mg / L in a 200 mL Erlenmeyer flask, and adjust the pH of the solution to 3, 4, 5, 6, 7, 8, 9 in triplicate, respectively. Dosing 0.003 g Fe 3 o 4 Magnetic material adsorbent / 0.003 g The adsorbent provided by the patent of the present invention is shaken and cultivated in a water bath culture shaker at room temperature, from Fe 3 o 4 Add the solution to start timing, shake and adsorb for 1 hour, and measure the concentration of uranium remaining in it. When pH is 3-9, Fe 3 o 4 The adsorption rates of MFS are 45.26%, 39.68%, 47.03%, 50.76%, 51.98%, 49.38%, 50.76%; 6.64%. It can be seen from this that Fe 3 o 4 When the pH is 7, the maximum adsorption rate is 51.98%, and the adsorbent provided by the patent of the present invention reaches the maximum adsorption rate of 41.13% when the pH is 6.

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Abstract

The invention relates to a method for preparing an adsorbent 4-sulfocalix[6]arene-modified magnetic nano Fe3O4 and adsorbing low-concentration uranium with the adsorbent. Modification of magnetic nano Fe3O4 with 4-sulfocalix[6]arene is realized as follows: Fe-O bonds are formed through magnetic nano Fe3O4 and phenolic hydroxyl groups on the lower edge of 4-sulfocalix[6]arene to promote grafting of magnetic nano Fe3O4 and 4-sulfocalix[6]arene, and the purpose of modification is achieved. After magnetic nano Fe3O4 is modified with 4-sulfocalix[6]arene, the hydrophilcity of magnetic nano Fe3O4 is increased, the surface area is increased, and magnetic nano Fe3O4 is can be better bonded with UO2<2+> through a complexing reaction, electrostatic bonding and other reactions. The adsorbent has higher adsorption rate and better adsorption effect than the magnetic nano Fe3O4 adsorbent.

Description

technical field [0001] The invention relates to the field of preparation of functionalized magnetic nanomaterials and the adsorption treatment of uranium-contaminated water bodies, in particular to a method of using 4-sulfonylcalix[6]arene hydrate to absorb magnetic nano-Fe 3 o 4 A method for modifying and preparing a functionalized magnetic nano-adsorbent, and a method for treating low-concentration uranium-containing wastewater. Background technique [0002] Uranium is an important strategic reserve material. With the continuous expansion of nuclear energy development and nuclear technology application, the world is vigorously developing and utilizing uranium resources. A large amount of uranium-containing wastewater will be generated in uranium hydrometallurgy, uranium enrichment, and uranium product processing. After preliminary treatment, the uranium concentration can still reach 5mg∙L -1 About 125 times the national allowable emission concentration, 166 times the max...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30G21F9/12
CPCB01J20/223B01J20/28009G21F9/12
Inventor 李乐廖琪袁亚莉成彬唐双阳卢炜
Owner NANHUA UNIV
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