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Preparation method of carbonaceous adsorbent modified by nanometer cuprous oxide/copper and application in iodine removal

A technology of nano-cuprous oxide and carbon-based adsorbents, which is applied in chemical instruments and methods, radioactive purification, and other chemical processes. It can solve the problems of low adsorption performance and achieve low cost, mild preparation conditions, and simple processes.

Inactive Publication Date: 2017-06-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon is a widely used adsorbent, but the adsorption performance of activated carbon alone on radioactive iodide ions in water is low, and it needs to be modified to improve the adsorption performance

Method used

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  • Preparation method of carbonaceous adsorbent modified by nanometer cuprous oxide/copper and application in iodine removal
  • Preparation method of carbonaceous adsorbent modified by nanometer cuprous oxide/copper and application in iodine removal
  • Preparation method of carbonaceous adsorbent modified by nanometer cuprous oxide/copper and application in iodine removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First weigh 1.32g of polyethyleneimine, add 100mL of ultrapure water, and stir magnetically until it is completely dissolved. Then add 1.97g of copper nitrate and stir magnetically to obtain a uniform blue solution. Take by weighing 2g coconut shell activated carbon again, magnetic stirring. Put it into an autoclave, seal the reactor, and keep it at 220° C. for a constant temperature hydrothermal reaction for 3 hours. After the autoclave was naturally cooled to room temperature, the obtained sample was washed with deionized water several times, and vacuum-dried at 60°C to obtain nano-cuprous oxide / copper-modified activated carbon, such as figure 1 shown.

[0025] The morphology of the prepared nano-cuprous oxide / copper-modified activated carbon was observed by scanning electron microscopy (SEM), and the chemical element composition of the nano-cuprous oxide / copper-modified activated carbon was analyzed by energy dispersive spectroscopy (EDS), which was used to adsorb ...

Embodiment 2

[0027] First weigh 1.06g of polyethyleneimine, add 100mL of ultrapure water, and stir magnetically until it is completely dissolved. Then add 1.18g of copper nitrate, stir magnetically to obtain a uniform blue solution. Take by weighing 2g coconut shell activated carbon again, magnetic stirring. Put it into an autoclave, seal the reactor, and keep it at 180° C. for a constant temperature hydrothermal reaction for 3 hours. After the autoclave was naturally cooled to room temperature, the obtained sample was washed with deionized water several times, and vacuum-dried at 50° C. to obtain nano-cuprous oxide / copper-modified activated carbon.

[0028] Add 1g / L nano-cuprous oxide / copper-modified activated carbon to the water containing 2mg / L simulated radioactive iodide ions, the temperature is 25°C, and the stirring speed is 200 rpm. Compared with Example 1, the adsorption efficiency of nano cuprous oxide / copper modified activated carbon prepared in Example 2 was 95.7%.

Embodiment 3

[0030] First weigh 3.05g of polyethyleneimine, add 100mL of ultrapure water, and stir magnetically until it is completely dissolved. Then add 5.90g of copper nitrate, and magnetically stir to obtain a uniform blue solution. Take by weighing 2g coconut shell activated carbon again, magnetic stirring. Put it into an autoclave, seal the reactor, and keep it at 200° C. for a constant temperature hydrothermal reaction for 3 hours. After the autoclave was naturally cooled to room temperature, the obtained samples were washed with deionized water several times, and dried in vacuum at 80° C. to obtain nano-cuprous oxide / copper-modified activated carbon.

[0031] Add 1g / L nano-cuprous oxide / copper-modified activated carbon to the water containing 2mg / L simulated radioactive iodide ions, the temperature is 25°C, and the stirring speed is 200 rpm. Compared with Example 1, the adsorption efficiency of nano cuprous oxide / copper modified activated carbon prepared in Example 3 was 84.1%. ...

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Abstract

The invention relates to a preparation method of carbonaceous adsorbent modified by nanometer cuprous oxide / copper and an application in iodine removal. The preparation method includes steps of adding polyethyleneimine in ultra-pure water, and then mixing and stirring with copper nitrate; adding active carbon and placing it in a high-pressure kettle; sealing the reaction kettle, performing the hydrothermal reaction for 3-12 hours at 80-220 DEG C; naturally cooling the high-pressure kettle to room temperature, washing a solid sample by de-ionized water, and vacuum-drying at 50-80 DEG C; acquiring the active carbon modified by nanometer cuprous oxide / copper. The active carbon modified by nanometer cuprous oxide / copper is feed into radioactive water containing iodine ion, and has good absorbing performance to the iodine ion in the water body; under the condition that the initial concentration is 1-30 mg / L and the absorbent feeding amount is 1g / L, the removal effect is 90% above; the method can be applied to the emergency treatment of water body polluted by radioactive iodine ion; therefore, the preparation method of carbonaceous adsorbent modified by nanometer cuprous oxide / copper is an economic and practicable method for removing the radioactive iodide ion.

Description

technical field [0001] The invention belongs to the technical field of radioactive water treatment, and relates to a preparation method of a nano-cuprous oxide / copper modified activated carbon high-efficiency adsorbent and the adsorbent for treating radioactive iodide ions in water. Background technique [0002] There are 26 isotopes of iodine, i.e. I 115 ~I 140 , I 127 is the only stable isotope among them, and the rest are radioactive, especially 125 I. 131 I and 129 I is the most serious hazard to the environment. Radioactive iodine is mainly produced in the nuclear industry, industrial agriculture and medical fields. When nuclear explosions and reactor accidents occur, if the radioactive iodine produced enters the water body environment (such as oceans, rivers, groundwater, etc.) without proper treatment, it finally enters the human body through adsorption, absorption, food chain, etc. It can cause cancer of the thyroid and other organs, causing immeasurable damag...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30G21F9/12
CPCB01J20/0237B01J20/06B01J20/20G21F9/12
Inventor 顾平张晓媛张光辉李晓媛侯立安
Owner TIANJIN UNIV
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