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Method for absorbing uranium with uranium template ion imprinted ploy(N-isopropyl acrylamide)/chitosan interpenetrating polymer network hydrogel

A technology of isopropylacrylamide and methylenebisacrylamide, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of small adsorption surface area and poor adsorption selectivity

Inactive Publication Date: 2015-07-08
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally disadvantages such as poor adsorption selectivity and small adsorption surface area. Therefore, a new type of adsorbent has been developed to make it have better adsorption selectivity, larger adsorption surface area, and high adsorption capacity for uranium. Important theoretical significance, but also has practical application value

Method used

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  • Method for absorbing uranium with uranium template ion imprinted ploy(N-isopropyl acrylamide)/chitosan interpenetrating polymer network hydrogel
  • Method for absorbing uranium with uranium template ion imprinted ploy(N-isopropyl acrylamide)/chitosan interpenetrating polymer network hydrogel
  • Method for absorbing uranium with uranium template ion imprinted ploy(N-isopropyl acrylamide)/chitosan interpenetrating polymer network hydrogel

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Experimental program
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Effect test

Embodiment 1

[0025] Accurately weigh 0.03 g of ion-imprinted PNIPAAm / CS hydrogel and add it to 50 μg / mL uranium standard solution, shake at 30 oC for an appropriate time, take 1 mL of supernatant at regular intervals, add 2 mL of buffer solution, 2 mL Arsenazo III, dilute to 25 mL, and measure the absorbance.

[0026] Figure 4 It is the ion imprinted PNIPAAm / CS interpenetrating network hydrogel’s adsorption capacity for uranium versus adsorption time. It can be seen from the figure that the adsorption of uranium by the gel increases significantly from 2 h to 5 h. The amount of uranium adsorbed by the gel changes slowly with time at 8 hours, and it can be seen that the adsorption equilibrium is reached at about 8 hours. In 8h, the adsorption of uranium on the gel reached 89 mg / g.

Embodiment 2

[0028] Accurately weigh 6 parts of 0.03 g ion-imprinted PNIPAAm / CS hydrogel, add it into the uranium solution with a concentration of 70 μg / mL at a temperature of 20oC, adjust to the optimal pH, and increase the temperature of the system by 5oC at regular intervals , respectively take 1 mL of supernatant, add 2 mL of chloroacetic acid-sodium acetate buffer solution with pH=2.5, 2 mL of arsenazo III, make the volume to 25 mL, develop color for 25 min, and measure the absorbance.

[0029] Figure 5 It is the change curve of the influence of temperature on the adsorption of uranium by ion imprinted gel. As the temperature increases, the amount of uranium adsorbed by ion imprinted gel increases. This is due to the fact that elevated temperature enhances the mobility of uranyl ions, giving them sufficient energy to interact with active adsorption sites, thereby significantly affecting the adsorption equilibrium. When the temperature is higher than LCST, the adsorption amount of...

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Abstract

The invention relates to a method for absorbing uranium with a uranium template ion imprinted ploy(N-isopropyl acrylamide) / chitosan interpenetrating polymer network hydrogel. The method comprises the following steps: with chitosan as a monomer, dissolving chitosan in acetic acid, adding a high-concentration uranium solution under certain conditions and allowing chitosan to adsorb uranium ions; then adding N-isopropyl acrylamide (NIPAAm) monomer and simultaneously adding an N,N '-methylenebisacrylamide (MBA) cross-linking agent, an ammonium persulfate (APS) initiator and an N,N,N ',N '-tetramethyl ethylenediamine (TEMED) promoter so as to prepare the U(VI) imprinted PNIPAAm / CS interpenetrating polymer network hydrogel; and researching adsorptivity of U(VI). Compared with traditional gel, the hydrogel provided by the invention has the characteristics of good adsorption selectivity, a great adsorption surface area, high uranium adsorption capacity, etc.

Description

technical field [0001] The invention belongs to the technical field of uranium adsorption, and relates to a poly N-isopropylacrylamide / chitosan (referred to as uranium template ion imprinted PNIPAAm / CS, the same below) interpenetrating network hydrogel imprinted with uranium template ions The method of adsorbing uranium. Background technique [0002] Uranium (U) is a very important energy material, which is of great significance in industry, agriculture, national defense and science and technology. As a nuclear fuel, uranium can release huge amounts of energy in nuclear reactors. In a light water reactor, 1 ton of natural uranium is equivalent to 15-17 thousand tons of coal, which can reach 45-50 megawatts for power generation; in a fast neutron breeder reactor, 1 ton of natural uranium is equivalent to about 1 million tons of coal, which can Power generation is about 3 billion kWh. At the same time, nuclear fuel is also widely used in propulsion power in transportation v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08J3/075C08F220/54C08F222/38B01J20/26B01J20/28G21F9/12
Inventor 刘云海花明曹小红张志宾邹义冬
Owner EAST CHINA UNIV OF TECH
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