Cesium ion removal method based on bentonite-chitosan composite microspheres

A composite microsphere, chitosan technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problem of untargeted removal of pollutants, lengthy removal method steps, solid-liquid Difficulty in separation and other problems, to achieve a wide range of pH, low requirements for adsorption conditions, and environmental friendliness

Active Publication Date: 2018-08-21
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The existing technologies represented by the above-mentioned patent documents all have the defects of lengthy removal method steps, high cost, high energy consumption, difficult solid-liquid separation and untargeted removal of pollutants.

Method used

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  • Cesium ion removal method based on bentonite-chitosan composite microspheres
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  • Cesium ion removal method based on bentonite-chitosan composite microspheres

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Embodiment 1

[0040] A method for removing cesium ions based on bentonite-chitosan composite microspheres includes adding magnetic porous bentonite-chitosan composite microspheres into waste water containing radionuclide cesium ions, and then shaking at a constant temperature.

[0041] The mass of the magnetic porous bentonite-chitosan composite microsphere is 0.1 g, the cesium ion in the waste water is cesium-133, the concentration is 50 mg / L, and the pH range of the waste water is 3.5.

[0042] The temperature of the constant temperature is 24° C., and the oscillation frequency is 120 r / min.

[0043] The oscillating adsorption time is 12h.

[0044] "Adding magnetic porous bentonite chitosan composite microspheres to wastewater containing radionuclide cesium ions, and then shaking at a constant temperature", has excellent adsorption performance for cesium ions, large adsorption capacity, and the maximum equilibrium adsorption capacity is 57.084mg / g ;The requirement for adsorption is low, ...

Embodiment 2

[0046] A method for removing cesium ions based on bentonite-chitosan composite microspheres includes adding magnetic porous bentonite-chitosan composite microspheres into waste water containing radionuclide cesium ions, and then shaking at a constant temperature.

[0047] The mass of the magnetic porous bentonite-chitosan composite microsphere is 0.1 g, the cesium ion in the waste water is cesium-133, the concentration is 100 mg / L, and the pH range of the waste water is 5.

[0048] The temperature of the constant temperature is 25° C., and the oscillation frequency is 120 r / min.

[0049] The vibration adsorption time is 15h.

Embodiment 3

[0051] A method for removing cesium ions based on bentonite-chitosan composite microspheres includes adding magnetic porous bentonite-chitosan composite microspheres into waste water containing radionuclide cesium ions, and then shaking at a constant temperature.

[0052] The mass of the magnetic porous bentonite-chitosan composite microsphere is 0.1 g, the cesium ion in the waste water is cesium-133, the concentration is 150 mg / L, and the pH range of the waste water is 7.

[0053] The temperature of the constant temperature is 26° C., and the oscillation frequency is 120 r / min.

[0054] The vibration adsorption time is 18h.

[0055] The cesium ion is cesium-133.

[0056] The magnetic porous bentonite-chitosan composite microspheres are obtained by dissolving bentonite in acetic acid solution, mechanically stirring and fully mixing, adding chitosan, and then adding Fe 3+ / Fe 2+ Obtain a mixed solution; prepare a mixed solution of sodium citrate and sodium hydroxide; drop th...

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Abstract

The invention discloses a cesium ion removal method based on bentonite-chitosan composite microspheres. The cesium ion removal method is characterized in that magnetic porous bentonite-chitosan composite microspheres are added into wastewater containing radionuclide cesium ions, and then constant-temperature oscillation is performed. The cesium ion removal method has the excellent adsorptive property on cesium ions, has large adsorption capacity, is not sensitive to pH, has strong antijamming capability to co-existing ions, is wide in application range and is friendly to the environment, the ions can be recovered through magnetic fields after wastewater treatment. The whole removal method comprises single steps and are low in cost and energy consumption.

Description

technical field [0001] The invention relates to the technical field of radioactive waste water treatment and environmental protection, in particular to a method for removing cesium ions based on bentonite-chitosan composite microspheres. Background technique [0002] At present, cesium ions are widely used in the nuclear industry. As the product of uranium nuclear fission, radioactive cesium ions appear in large quantities in nuclear sewage. In 2011, the Fukushima nuclear power plant in Japan exploded, resulting in the leakage of radioactive materials and the discharge of a large amount of waste water containing radioactive cesium. At present, nuclear energy is being used more and more widely as a new type of energy, and the treatment of radioactive waste water has become a major environmental problem facing the world today. Cesium ions are highly toxic, have a long half-life, are easy to deposit in the human body, and are difficult to degrade. [0003] In order to reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/12B01J20/24B01J20/28
CPCB01J20/24G21F9/12B01J20/28021
Inventor 蒲生彦颜椿王可心马慧余静黄虹雁
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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