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Method for adsorbing uranium by using macroporous poly-N-isopropylacrylamide/chitosan semi-interpenetrating network temperature-sensitive hydrogel

A technology of isopropylacrylamide and semi-interpenetrating network, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc. poor mechanical strength

Inactive Publication Date: 2015-05-27
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 deficiencies such as strong adsorption capacity but difficult desorption, poor mechanical strength, and difficult control of the adsorption and desorption process. Therefore, a new type of adsorbent has been developed to have a large adsorption surface area and mechanical Good strength, controllable adsorption and desorption process, high adsorption capacity for uranium, not only has important theoretical significance, but also has practical application value

Method used

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  • Method for adsorbing uranium by using macroporous poly-N-isopropylacrylamide/chitosan semi-interpenetrating network temperature-sensitive hydrogel
  • Method for adsorbing uranium by using macroporous poly-N-isopropylacrylamide/chitosan semi-interpenetrating network temperature-sensitive hydrogel
  • Method for adsorbing uranium by using macroporous poly-N-isopropylacrylamide/chitosan semi-interpenetrating network temperature-sensitive hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Accurately weigh 0.5g of chitosan monomer and dissolve it in acetic acid with a mass fraction of 5%, add 15g of NIPAAm monomer and 0.5g of cross-linking agent MBA, and mix well.

[0024] 2) Add 0.6 mL of emulsifier stabilizer PVA and 0.8 mL of emulsifier Span-80 under stirring, and add 0.03 g of initiator APS and 60 μL of accelerator TEMED after stirring for 5-10 min.

[0025] 3) After stirring for 10-15 min and standing still for 24 h, take out the gel, wash off the pore-forming agent Span-80 and PVA with ethanol, then soak in distilled water for 48 h, change the water regularly to remove unreacted monomers, and residual triggers agent or catalyst, and finally the gel was cut into pieces and freeze-dried for later use.

[0026] figure 1 It is the scanning electron microscope picture of the macroporous gel, the magnification is 5000 times, figure 2 The magnification is 25000 times. It can be seen from the figure that there is an obvious pore structure inside t...

Embodiment 2

[0028] The hydrogel prepared in Example 1 was used to investigate the adsorption performance of uranium, and three 0.03g gels were accurately weighed, and the first one was used as a control sample. Add the second part to 70 μg / mL uranium standard solution, shake at 308.15K for an appropriate time, take 1 mL of supernatant at regular intervals, add 2 mL of buffer solution, 2 mL of arsenazo III, and dilute to 25 mL, measure the absorbance, analyze the concentration of uranium in the solution before and after adsorption, and calculate the amount of uranium adsorbed. Add the third part to 70 μg / mL uranium standard solution, shake at two temperature points of 293.15K and 323.15K for an appropriate time, take 1 mL of supernatant at regular intervals, add 2 mL of buffer solution, 2 mL of arsenazo III , set the volume to 25 mL, measure the absorbance, and calculate the adsorption amount of uranium.

[0029] image 3 is the infrared spectrum of the macroporous gel that has not ads...

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Abstract

The invention relates to a method for adsorbing uranium by using macroporous poly-N-isopropylacrylamide / chitosan semi-interpenetrating network temperature-sensitive hydrogel. The method comprises the following steps: by utilizing emulsion polymerization means, taking Span-80 as an emulsifier, taking N,N'-methylene bisacrylamide (MBA) as a cross-linking agent, taking ammonium persulfate (APS) as an initiator, and taking N,N,N',N'-tetramethylethylenediamine (TEMED) as an accelerant, preparing the macroporous poly-N-isopropylacrylamide / chitosan semi-interpenetrating network temperature-sensitive hydrogel under certain conditions, and researching and measuring the adsorption performance of the hydrogel on uranium. Compared with the traditional gel and pore-free gel, the hydrogel disclosed by the invention has the characteristics of high mechanical strength, good swelling properties, large adsorption surface area, controllable adsorption and desorption processes, high uranium adsorption quantity and the like.

Description

technical field [0001] The invention belongs to the technical field of uranium adsorption, and relates to a method for adsorbing uranium with a semi-interpenetrating network temperature-sensitive hydrogel of macroporous poly N-isopropylacrylamide / chitosan (abbreviated as macroporous PNIPAAm / CS, the same below). method. 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 ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30G21F9/12
Inventor 曹小红张志宾刘云海花榕吴芬
Owner EAST CHINA UNIV OF TECH
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