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Bismuth-based functional material for adsorbing gaseous iodine as well as preparation method and application thereof

A functional material, bismuth-based technology, applied in the field of bismuth-based functional materials adsorbing gaseous iodine and its preparation, can solve the problems of high cost, low adsorption capacity, difficult recovery, etc., and achieve good thermal stability, simple preparation method and process controllable effect

Active Publication Date: 2020-11-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention aims to provide a bismuth-based adsorption material with abundant active sites and a high adsorption capacity for gaseous iodine, and the material has stable performance, which can solve the problems of low adsorption capacity, high cost and recycling of existing silver-based adsorbents. Difficulty and other issues

Method used

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  • Bismuth-based functional material for adsorbing gaseous iodine as well as preparation method and application thereof
  • Bismuth-based functional material for adsorbing gaseous iodine as well as preparation method and application thereof
  • Bismuth-based functional material for adsorbing gaseous iodine as well as preparation method and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0043] Schematic diagram of the preparation process of bismuth-based functional materials figure 1 Shown:

[0044] (1) Preparation of precursor solution: Weigh bismuth nitrate pentahydrate, polyacrylonitrile and dimethylformamide at a mass ratio of 0.08:0.10:1, stir to mix them evenly, and obtain a spinning precursor solution;

[0045] (2) Electrospinning: Spin the precursor solution prepared in the above step (1) in an electrospinning machine, the voltage is 24KV, and the spinning rate is 0.010mL / min to obtain a fiber film;

[0046] (3) Pre-oxidation: the fiber membrane prepared in the above step (2) was heated up to 260° C. at a rate of 2° C. / min in an air atmosphere, and kept at this temperature for 2 hours.

[0047] (4) Carbonization: heat up the pre-oxidized fiber membrane prepared in the above step (3) to 800°C at a rate of 5°C / min in an atmosphere of inert gas, and keep it at this temperature for 2h to obtain adsorption Bismuth-based functional materials of gaseous io...

Embodiment 2

[0063] The schematic diagram of the preparation process of bismuth-based functional materials is also as figure 1 Shown:

[0064] (1) Preparation of precursor solution: Weigh bismuth nitrate pentahydrate, polyacrylonitrile and dimethylformamide at a mass ratio of 0.08:0.10:1, stir to mix them evenly, and obtain a spinning precursor solution;

[0065] (2) Electrospinning: Spin the precursor solution prepared in the above step (1) in an electrospinning machine, the voltage is 24KV, and the spinning rate is 0.010mL / min to obtain a fiber film;

[0066] (3) Pre-oxidation: the fiber membrane prepared in the above step (2) was heated up to 260° C. at a rate of 2° C. / min in an air atmosphere, and kept at this temperature for 2 hours.

[0067] (4) Carbonization: heat up the pre-oxidized fiber membrane prepared in the above step (3) to 650°C at a rate of 5°C / min in an atmosphere of inert gas, and keep it at this temperature for 2 hours to obtain adsorption Bismuth-based functional mat...

Embodiment 3

[0070] The schematic diagram of the preparation process of bismuth-based functional materials is also as figure 1 Shown:

[0071] (1) Preparation of precursor solution: Weigh bismuth nitrate pentahydrate, polyacrylonitrile and dimethylformamide according to a mass ratio of 0.06:0.12:1, stir to mix them evenly, and obtain a spinning precursor solution;

[0072] (2) Electrospinning: Spin the precursor solution prepared in the above step (1) in an electrospinning machine, the voltage is 20KV, and the spinning rate is 0.010mL / min to obtain a fiber film;

[0073] (3) Pre-oxidation: the fiber membrane prepared in the above step (2) was heated up to 280° C. at a rate of 2° C. / min in an air atmosphere, and kept at this temperature for 1 hour.

[0074] (4) Carbonization: heat up the pre-oxidized fiber membrane prepared in the above step (3) to 8000°C at a rate of 5°C / min in an atmosphere of inert gas, and keep it at this temperature for 2h to obtain adsorption Bismuth-based functiona...

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Abstract

The invention relates to the technical field of nuclear fuel post-treatment, and discloses a bismuth-based functional material capable of adsorbing gaseous iodine as well as a preparation method and application thereof. The method includes dissolving a bismuth salt and polyacrylonitrile into a solvent and mixing to form a precursor solution; carrying out electrostatic spinning to obtain a fiber membrane; and then pre-oxidizing in an air atmosphere and carbonizing in an inert gas atmosphere to obtain the bismuth-based functional material. According to the material, a carbon nanofiber membrane is used as a carrier, and metal bismuth nanoparticles are uniformly attached to fibers, so that rich active sites are provided for chemical adsorption of iodine, the adsorption capacity can reach 560 mg / g, and gaseous iodine can be effectively adsorbed and separated. Meanwhile, the material is simple in preparation method and low in raw material cost, and more importantly, compared with most of powdery adsorbents, the material has a macroscopic membrane form structure, is good in flexibility and high in thermal stability, is expected to be applied to large-scale industrial application in the spent fuel aftertreatment process and has a wide prospect.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel reprocessing, in particular to a bismuth-based functional material for adsorbing gaseous iodine, a preparation method and application thereof. Background technique [0002] Nuclear power is an ideal green energy with the advantages of safety, cleanliness, economy and high efficiency. In the development of nuclear power, my country has always adhered to the policy of closed nuclear fuel cycle, and spent fuel will inevitably be reprocessed. Therefore, a large amount of radioactive waste gas will inevitably be generated in the process of spent fuel treatment. Radioactive gaseous iodine (I 129 , I 131 ) is one of them. Due to its extremely strong volatility and radiotoxicity, exposure to radioactive iodine can lead to risks such as metabolic disorders, mental retardation, and increased risk of thyroid cancer. [0003] At present, radioactive gaseous iodine is mainly separated by solid adsorpti...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00G21F9/02
CPCB01D67/0067B01D71/02G21F9/02
Inventor 肖成梁田振江
Owner ZHEJIANG UNIV
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