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Method for removing radionuclide by using nano Fe3O4-CeO2 material

A fe3o4-ceo2, radionuclide technology, used in radioactive purification, nuclear engineering and other directions, can solve the problems of low anti-pollution ability, short service life, poor thermal stability and other problems, achieve easy recovery, difficult desorption, adsorption reaction mild effects

Active Publication Date: 2014-02-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many organic adsorption materials are used, but there are problems such as low adsorption efficiency, poor thermal stability, low anti-pollution ability, and short service life.

Method used

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  • Method for removing radionuclide by using nano Fe3O4-CeO2 material
  • Method for removing radionuclide by using nano Fe3O4-CeO2 material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] nano Fe 3 o 4 -CeO 2 Materials used for adsorptive removal of simulated radionuclides 90 Sr and 60 Co, the steps are as follows: a reagent bottle with a volume of 20mL is used as a reactor, and waste water containing radionuclides contains Sr 2+ and Co 2+ solutions, including single nuclide systems and Sr 2+ and Co 2+ Coexisting multi-nuclide system, the pH is not adjusted (5.5-5.8), add nano-Fe at an amount of 0.6g / L to 15mL of waste water containing radionuclides 3 o 4 -CeO 2 For materials, the reactor was sealed and then placed in a desktop constant temperature shaking incubator for reaction at a speed of 150 rpm and a temperature of 30°C. Equilibrium adsorption amount after 8h reaction (q e ) See Table 1:

[0021] Table 1 Nano Fe 3 o 4 -CeO 2 Material Removal Radionuclide Results Data Sheet

[0022] system

[0023] Detection method: After the sample is filtered through a 0.22m microporous membrane, the initial and remaining Sr is detected by...

Embodiment 2

[0025] nano Fe 3 o 4 -CeO 2 The material is used to adsorb and remove the simulated radionuclide Sr 2+, the steps are as follows: a reagent bottle with a volume of 20mL is used as a reactor, and 15mL of Sr 2+ Wastewater solution, then add nano Fe in an amount of 0.6g / L 3 o 4 -CeO 2 For materials, the reactor was sealed and then placed in a desktop constant temperature shaking incubator for reaction at a speed of 150 rpm and a temperature of 30°C. Equilibrium adsorption capacity (q e ) see Table 2:

[0026] Table 2 Nano-Fe at different pH 3 o 4 -CeO 2 Material removal nuclide Sr 2+ Result data table

[0027] pH

[0028] Detection method: with embodiment 1.

Embodiment 3

[0030] nano Fe 3 o 4 -CeO 2 Materials used for adsorptive removal of simulated radionuclide Co 2+ , the steps are as follows: a reagent bottle with a volume of 20mL is used as a reactor, and 15mL of Co 2+ Wastewater solution and nano-Fe 3 o 4 -CeO 2 Material, pH is 5.5, the reactor is sealed and placed in a desktop constant temperature shaking incubator for reaction, the rotation speed is 150 rpm, and the temperature is 30°C. different nano Fe 3 o 4 -CeO 2 Equilibrium adsorption amount (q e ) See Table 3:

[0031] Table 3 Different nano-Fe 3 o 4 -CeO 2 Nuclide Co 2+ The removal results data table for

[0032]

[0033]

[0034] Detection method: with embodiment 1.

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Abstract

The invention belongs to the technical field of radioactive wastewater treatment, and particularly relates to a method for removing radionuclide by using a nano Fe3O4-CeO2 material. The method comprises the steps as follows: the nano Fe3O4-CeO2 material is added into wastewater containing the radionuclide; then the wastewater and the nano material are mixed fully; and the radionuclide can be effectively removed after certain reaction time. According to the method, the nano Fe3O4-CeO2 material has large adsorption capacity to the radionuclide; desorption cannot be realized easily; the nano material after adsorption has a magnetic property and can be recycled easily; and a radioactive waste after the reaction is small in size and convenient to store temporarily. The reaction conditions are mild, and the method has a wide application prospect in the aspect of radioactive wastewater treatment. The nano Fe3O4-CeO2 material has saturated adsorption capacity to 90 Sr and saturated adsorption capacity to 60 Co are 21 mg / g and 19 mg / g respectively.

Description

technical field [0001] The invention belongs to the technical field of radioactive wastewater treatment, in particular to a method using nano-Fe 3 o 4 -CeO 2 Methods of removing radionuclides from materials. Background technique [0002] With the exploitation of minerals and petroleum, the development of the nuclear industry and the wide application of nuclear technology in various fields such as industry, agriculture, energy, military affairs, and health care, a large number of 90 Sr, 60 Radioactive wastewater of Co and other nuclides. Radioactive substances will cause three effects (teratogenic, carcinogenic, mutagenic) after entering the organism; radionuclide 60 Co is highly toxic, has a long half-life (5.27 years), and high γ-ray energy (average 1.25 Mev). If it is not properly disposed of, it will have a significant impact on the environment and human health. Especially after the Fukushima nuclear power plant accident in Japan in 2011, a large amount of radionucl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/12
Inventor 王建龙徐乐瑾
Owner TSINGHUA UNIV
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