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Uranium adsorbent and preparation method thereof

A technology of adsorbent and adsorption capacity, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of low selectivity of uranium adsorbent, environmental pollution, small adsorption capacity, etc. , to achieve the effect of fast speed, good environment and large adsorption capacity

Inactive Publication Date: 2018-12-18
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, the current uranium adsorbents have many shortcomings such as low selectivity, small adsorption capacity, poor stability, and easy pollution to the environment.

Method used

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  • Uranium adsorbent and preparation method thereof
  • Uranium adsorbent and preparation method thereof
  • Uranium adsorbent and preparation method thereof

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preparation example Construction

[0036] The preparation method of the above-mentioned uranium adsorbent will be described in detail below.

[0037] The preparation method of uranium adsorbent of the present invention comprises the following steps:

[0038] In step S1, low-temperature plasma is used to treat carbon nanotubes to obtain amidated carbon nanotubes.

[0039] Specifically, the preparation method of amidated carbon nanotubes is as follows: firstly, carbon nanotubes and grafted monomers are mixed, and the resulting mixture is placed in a low-temperature plasma reactor; then, under a protective atmosphere, the aforementioned mixture is placed in a React for at least 30 minutes at a temperature of 200° C. to 400° C. and a discharge power of 10 W to 20 W to obtain amidated carbon nanotubes.

[0040] More specifically, the grafting monomer can be dimethyl diamide or diaminomaleonitrile; when the grafting monomer is dimethyl diamide, then control the ratio of carbon nanotubes and dimethyl diamide to be 1...

Embodiment 1

[0052] First, weigh 4.52g FeCl 3 ·6H 2 O was added to 200mL deionized water to obtain a ferric chloride solution.

[0053] Then, 2 g of unmodified nanotubes were weighed and dispersed in the ferric chloride solution, ultrasonicated for 30 min, and mechanically stirred for 12 h to obtain a stable suspension.

[0054] In the third step, at N 2 Atmosphere, add 1.83g FeCl to the suspension 2 4H 2 O, heat the solution to 70°C, and quickly add 8 mL of ammonia (NH 4 OH, 30%), continued to reflux at 70°C for 1h, cooled to room temperature, washed with deionized water repeatedly until neutral, and then placed in a vacuum drying oven to dry at a constant temperature of 70°C to obtain magnetic carbon nanotubes.

[0055] In the fourth step, magnetic carbon nanotubes are mixed with dimethyl diamide according to the ratio of 0.5g / 200mL, placed in a low-temperature plasma reactor PDC-32G-2, Harrick Plasma), and N 2 , and treated for 30 minutes under the conditions of a temperature of 2...

Embodiment 2

[0060] First, weigh 6.61g FeCl 3 ·6H 2 O was added to 200mL deionized water to obtain a ferric chloride solution.

[0061] Then, 3 g of unmodified nanotubes were weighed and dispersed in the ferric chloride solution, ultrasonicated for 30 min, and mechanically stirred for 12 h to obtain a stable suspension.

[0062] In the third step, at N 2 Atmosphere, add 2.72g FeCl to the suspension 2 4H 2 O, heat the solution to 90°C, quickly add 10mL ammonia water (NH 4 OH, 30%), continued to reflux at 90°C for 1h, cooled to room temperature, washed with deionized water repeatedly until neutral, and then placed in a vacuum drying oven at a constant temperature of 70°C to obtain magnetic carbon nanotubes.

[0063] In the fourth step, magnetic carbon nanotubes are mixed with dimethyl diamide according to the ratio of 0.8g / 300mL, placed in a low-temperature plasma reactor PDC-32G-2, Harrick Plasma), and N 2 , treated for 1 h at a temperature of 320° C. and a discharge power of 15 W to ...

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Abstract

The invention discloses a uranium adsorbent. The uranium adsorbent comprises carbon nanotubes and amidoxime groups grafted to the surfaces of the carbon nanotubes by low temperature plasma. The uranium adsorbent has the advantages of large specific surface area, high selectivity, large adsorption capacity, high speed, environmental friendliness and good uranium adsorption ability. The invention also discloses a preparation method of the uranium adsorbent. The method comprises the following steps: S1, treating the carbon nanotubes by the low temperature plasma to obtain amidated carbon nanotubes; S2, preparing an aqueous hydroxylamine hydrochloride solution, and adjusting the pH value of the solution to 7; and S3, adding the amidated carbon nanotubes to the neutral aqueous hydroxylamine hydrochloride solution, carrying out a reaction at 60-80 DEG C for at least 8 h, washing the obtained product until the product is neutral, and drying the washed product to obtain the uranium adsorbent.The preparation method makes the surfaces of the carbon nanotubes grafted with the amidoxime groups by the low-temperature plasma technology, so the method has the advantages of simple process, low cost, no concentrated acids or other raw materials, environment friendliness, and firmness in combination of the carbon nanotubes and the amidoxime groups.

Description

technical field [0001] The invention belongs to the technical field of adsorbent preparation, and specifically relates to a uranium adsorbent and a preparation method thereof. Background technique [0002] As an important natural radioactive element, uranium plays a pivotal role in both nuclear power benefiting mankind and nuclear technology related to national security. Most of the uranium currently used is leached from uranium ore. However, with the increasing demand for uranium in various countries around the world, the balance between supply and demand of uranium is gradually broken. People are eager to find unconventional uranium to ensure its long-term development. The idea of ​​uranium came into being. However, the content of uranium in seawater is low, and the processing capacity is large, so it is costly to meet certain production requirements. Compared with seawater, the uranium content in salt lake brine is much higher. The content of uranium in the saturated b...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30G21F9/12
CPCB01J20/205B01J20/28009B01J20/3085G21F9/12
Inventor 王婧张志宏高召永姜振飞乔英钧王敏马艳芳付振海张永明赵冬梅
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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