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Method for removing radioactive cobalt by using graphene loaded nanometer zero-valent iron composite material

A technology of nano-zero-valent iron and composite materials, which is applied in the fields of radioactive purification and nuclear engineering. It can solve the problems of high surface energy, easy agglomeration, and difficult separation, and achieve the effects of easy recovery, mild experimental conditions, and large adsorption capacity.

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

However, due to the high surface energy of graphene oxide, it is easy to agglomerate, and it is difficult to separate from the aqueous solution after being dispersed in water, so it is necessary to carry out surface modification.

Method used

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  • Method for removing radioactive cobalt by using graphene loaded nanometer zero-valent iron composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First prepare graphene oxide (GO), the steps are as follows: add 106mL concentrated sulfuric acid and 1.0g expandable graphite into the reaction vessel, stir in an ice-water bath for 30min; slowly add 5g potassium permanganate, and keep the system temperature not exceeding 15°C After the reaction is completed, withdraw from the ice-water bath, and stir at a constant temperature of 35±1°C for 3 days; then add deionized water three times, add 40mL for the first time, stir at 60±1°C for 60min, add 40mL for the second time, Keep at 90±1°C for 30min, add 40mL of deionized water directly for the third time; finally add 10mL of 30wt% H 2 o 2 , centrifuged at 12000r / min for 30min while hot, discarded the supernatant, centrifuged and washed several times with hydrochloric acid (mass fraction 36-38%) and distilled water at a volume ratio of 1:10, and freeze-dried for later use.

[0018] Then prepare graphene-supported nano zero-valent iron (Fe 0 / GO) composite material, the ste...

Embodiment 2

[0026] Fe 0 The preparation process of the / GO composite material is the same as in Example 1.

[0027] Will Fe 0 / GO Composite for Adsorption and Removal of Simulated Radionuclide Co 2+ , the steps are as follows: add 15mL of Co to the reactor 2+ Aqueous solution and 0.05g / L Fe 0 / GO composite material, the reactor was sealed and 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 7h reaction at different pH (q e ) see Table 2:

[0028] Table 2 Fe at different pH 0 / GO Composite Material Removal of Nuclide Co

[0029] pH

Initial concentration (mg / L)

Residual concentration (mg / L)

Equilibrium adsorption capacity (mg / g)

3

10

5.67

21.67

4

10

3.66

31.69

5

10

2.78

32.82

6

10

2.94

35.32

7

10

2.94

35.32

8

10

3.05

34.74

9

10

2...

Embodiment 3

[0033] Fe 0 The preparation process of the / GO composite material is the same as in Example 1.

[0034] Will Fe 0 / GO Composite for Adsorption and Removal of Simulated Radionuclide Co 2+, the steps are as follows: add 15mL of Co to the reactor 2+ Aqueous solution (pH4) and 0.2g / L Fe 0 / GO composite material, the reactor was sealed and placed in a desktop constant temperature shaking incubator for reaction at a speed of 150 rpm and a temperature of 30 °C. Different Co 2+ Equilibrium adsorption amount after 8h reaction at the initial concentration (q e ) See Table 3:

[0035] Table 3 Different Co 2+ Fe at initial concentration 0 / GO Composite Material Removal of Nuclide Co

[0036] Initial concentration (mg / L)

Residual concentration (mg / L)

Equilibrium adsorption capacity (mg / g)

10.49

3.20

36.45

20.26

10.21

50.25

40.63

28.66

59.85

81.59

69.30

61.45

101.80

88.54

66.31

193.66...

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Abstract

The invention discloses a method for removing radioactive cobalt by using a graphene loaded nanometer zero-valent iron composite material, and belongs to the technical field of radioactive waste treatment. The method comprises the following steps: adding the graphene loaded nanometer zero-valent iron composite material into a water sample containing the radioactive nuclide Co, vibrating the mixture at constant temperature, and removing the radioactive nuclide Co after a certain time. The graphene loaded nanometer zero-valent iron composite material used in the method disclosed by the invention can absorb and select the nuclide, is large in adsorption capacity, and less susceptible to desorption; the absorbed particle has the magnetic property, easy to recycle, small in size, and convenient to store temporarily, the experiment condition is mild, and therefore the composite material has an advantage in the aspect of removing the nuclide Co in the radioactive wastewater. The maximal equilibrium adsorption capacity of the graphene loaded nanometer zero-valent iron composite material used in the method disclosed by the invention on Co is 114.08mg / g.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a method for removing radioactive cobalt by using a graphene-loaded nano-zero-valent iron composite material. Background technique [0002] The safe disposal of radioactive waste is one of the major environmental issues facing the world today. Among them, radionuclides 60 Co is a neutron activation product in a nuclear reactor and a medical gamma radiation source, which can be used in radiotherapy and chemotherapy. 60 Co has the characteristics of high toxicity, long half-life (5.27 years), and high gamma ray energy (average 1.25MeV). If it is not properly disposed of, it will have a great impact on the environment and human health. [0003] At present, the main treatment technologies of radioactive wastewater include chemical precipitation method, evaporation concentration method, ion exchange method, soil infiltration, membrane treatment method...

Claims

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Application Information

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IPC IPC(8): G21F9/04
Inventor 王建龙徐乐瑾
Owner TSINGHUA UNIV
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