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Semi-interpenetrating network hydrogel film material for extracting uranium from seawater and preparation method of semi-interpenetrating network hydrogel film material

A semi-interpenetrating network and film material technology, which is applied in the field of semi-interpenetrating network hydrogel film materials and preparation, can solve the problems of high cost and low uranium absorption by natural seawater, and achieves low cost, excellent mechanical properties, high selective effect

Active Publication Date: 2019-06-07
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a method for preparing a semi-interpenetrating network hydrogel film material for extracting uranium from seawater, which solves the problems of low uranium absorption and high cost of existing similar materials for natural seawater

Method used

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  • Semi-interpenetrating network hydrogel film material for extracting uranium from seawater and preparation method of semi-interpenetrating network hydrogel film material
  • Semi-interpenetrating network hydrogel film material for extracting uranium from seawater and preparation method of semi-interpenetrating network hydrogel film material
  • Semi-interpenetrating network hydrogel film material for extracting uranium from seawater and preparation method of semi-interpenetrating network hydrogel film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Preparation and Characterization of Polyacrylamide Oxime PAO

[0041] The preparation of polyacrylamide oxime PAO comprises the following steps:

[0042] As in formula 1, add NH to 60mL DMF in a round bottom flask at 45°C 2 OH·HCl (80mmol) was dissolved, then added Na 2 CO 3 (40mmol) and NaOH (40mmol) and magnetically stirred for 3h, under the condition of constant temperature, polyacrylonitrile PAN (80mmol) was added to dissolve, then reacted at 65°C for 24h, supplemented with Na 2 CO 3 (20mmol), NaOH (20mmol) and hydroxylamine hydrochloride (40mmol) were reacted at 65°C for 12h, the reaction mixture was dropped into deionized water, and a white floc precipitate was obtained after filtering with a funnel, and dried under vacuum at 60°C 8h to obtain PAO.

[0043]

[0044] Characterization of polyacrylamide oxime PAO:

[0045] Depend on figure 1 It can be seen from the infrared spectrum that there is a C≡N infrared absorption peak (2244cm) in the inf...

Embodiment 2

[0047] Example 2: Preparation and performance characterization of a polyacrylamide oxime semi-IPN hydrogel

[0048] A kind of preparation of polyacrylamide oxime semi-interpenetrating network hydrogel, comprises the following steps:

[0049] Such as Figure 4 , 40 mg of PAO prepared in Example 1, 40 mg of monomer AAM, 6 mg of initiator AIBA, and 6 mg of cross-linking agent BIS were dissolved in 1 mL of 0.3 mol / L NaOH aqueous solution (pH 10), sonicated for 5 min, and then the prepared precursor Inject the liquid into a glass mold with a thickness of 0.2mm, and in sunlight (the measured ultraviolet intensity is 2.5±0.2mw / cm 2 ) under polymerization for 15min to prepare the polyacrylamide oxime semi-IPN hydrogel film, and the measured film thickness is 0.2mm. Such as figure 1 As shown in the mid-infrared spectrum, the 1649cm of the amidoxime group -1 (C=N) and 938cm -1 (N-O) The specific main peak indicates that PAO has been fixed in the PAAM semi-IPN, as Figure 5 The XPS...

Embodiment 3

[0051] The difference between Example 3 and Example 1 is that the mass ratio of monomer acrylamide AAM and PAO is different, PAO is 0mg, 20mg, 30mg, 50mg, 60mg and 80mg, and the mass ratio of AAM and PAO is 0, 4:2, 4:3, 4:4, 4:5, 4:6, and 4:8.

[0052] To study the uranium adsorption capacity test of polyacrylamide oxime semi-IPN hydrogel films prepared by different mass ratios of AAM and PAO monomers. Under the same conditions, the PAO hydrogel films were added to uranium-added seawater (32ppm) ,Such as Figure 9 As shown, the hydrogel with no PAO can hardly adsorb uranium (m AAM :m PAO =4:0), PAO hydrogels have outstanding uranium adsorption capacity. When increasing the ratio of PAO, the uranium adsorption capacity of the hydrogel (Q hydrogel ) began to increase; when m AAM :m PAO When the ratio reaches 4:4, continue to increase the ratio of PAO, Q hydrogel almost no change at all. On the other hand, when increasing the proportion of PAO, PAO(Q PAO , m U / m PAO )...

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Abstract

The invention discloses a preparation method of a semi-interpenetrating network hydrogel film material for extracting uranium from seawater. The preparation method comprises the steps: dissolving polypropylene amidoxime, a monomer, a photoinitiator and a crosslinking agent at a certain mass ratio in an alkaline aqueous solution so as to obtain a precursor solution firstly, then injecting the precursor solution into a mold, and performing a polymerization reaction under ultraviolet light or sunlight so as to obtain the semi-interpenetrating network hydrogel film material. The preparation methodis simple and rapid, has low cost, and can be applied to large-scale production of the PAO semi-interpenetrating network hydrogel film material through low energy consumption and environment-friendlysunlight polymerization under the alkaline condition; and the material has a thickness of 0.2 mm, uniform micro-pore size, high adsorption efficiency, high selectivity and excellent mechanical properties, and can be reused multiple times.

Description

technical field [0001] The invention relates to the field of novel adsorption materials, in particular to a semi-interpenetrating network hydrogel film material and a preparation method for extracting uranium from seawater. Background technique [0002] Nuclear energy is one of the most important alternative energy sources to traditional fossil fuels in response to the increasing global energy demand and serious environmental problems. The proven terrestrial uranium resources are rather limited and can only meet nuclear energy needs for about a few decades. However, sea water has 4.5*10 9 More than 1 ton of uranium, about 1000 times the amount of land ore, can provide nearly unlimited potential fuel for the long-term sustainable development of the nuclear energy industry. In addition, uranium in seawater can be adsorbed by a relatively green method without complex reprocessing of uranium enrichment waste. Over the past few decades, various adsorbent materials including in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C22B60/02C02F103/08
Inventor 马春新王宁高金祥闫冰洁
Owner HAINAN UNIVERSITY
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