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Antibacterial high-strength ultrathin composite membrane material, preparation method thereof, and application of material in uranium enrichment in uranium-containing wastewater or seawater

A composite membrane, high-strength technology, applied in the field of uranium resource recovery, to achieve the effects of good biocompatibility, excellent broad-spectrum antibacterial properties, and low cost

Active Publication Date: 2021-07-23
HAINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some amidoxime-based adsorbents with good mechanical strength or good antibacterial properties have been developed, it is necessary to design an efficient amidoxime-based adsorbent with excellent mechanical properties and antibacterial properties. still a challenge

Method used

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  • Antibacterial high-strength ultrathin composite membrane material, preparation method thereof, and application of material in uranium enrichment in uranium-containing wastewater or seawater
  • Antibacterial high-strength ultrathin composite membrane material, preparation method thereof, and application of material in uranium enrichment in uranium-containing wastewater or seawater
  • Antibacterial high-strength ultrathin composite membrane material, preparation method thereof, and application of material in uranium enrichment in uranium-containing wastewater or seawater

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Experimental program
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Effect test

Embodiment 1

[0037] Preparation of CNC-PAO composite membrane:

[0038] Dissolve 17.5 mg of PAO in 0.5 ml of NAOH solution with a concentration of 0.3 mol / L, then mix it with 50 μl of 6% sulfonated cellulose nanocrystal aqueous solution, and wait until the two are fully mixed. Add 0.2 μl of wet strength agent, and then add 0.5ml of chitosan quaternary ammonium salt solution with a concentration of 0.5% after mixing, and finally complete the preparation of the pre-liquid by fully oscillating and mixing with a vortex instrument. Glue a 1mm thick silicone rubber sheet with a 3*3cm hole to a glass sheet to form a mold, inject 200μl pre-liquid into the mold, and dry it in an oven at 65°C for 1 hour to form a spare State a film with a thickness of 10 μm.

[0039] Using Fourier transform infrared spectroscopy (FT-IR) to characterize the film material samples ( figure 1 a). After the oximation reaction, the C≡N characteristic absorption peak of PAN (2245cm -1 ) disappeared, and two new charact...

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Abstract

The invention discloses an antibacterial high-strength ultrathin composite membrane material, a preparation method thereof, and application of the material in uranium enrichment in uranium-containing wastewater or seawater. The composite membrane material is formed by dispersing and fixing a polypropylene amidoxime (PAO) functional material in a cross-linked network formed by sulfonated cellulose nanocrystals (CNC) and chitosan quaternary ammonium salt (QCS). The preparation method comprises the following steps: mixing a PAO solution and a CNC solution, sequentially adding a wet strength agent and a QCS solution, oscillating and mixing, and carrying out injection molding and drying molding to obtain the composite membrane material with high mechanical strength, broad-spectrum antibacterial performance and excellent uranium adsorption function. The uranium adsorption capacity of the composite membrane material to unfiltered seawater containing 16 ppm of uranium reaches 312 + / -17.5 mg / g, the uranium adsorption capacity of the composite membrane material to untreated natural seawater containing 16 ppm of uranium reaches 9.67 mg / g, the mechanical strength of the composite membrane material reaches 18.7 MPa, the service life of the composite membrane material is long, after seven times of adsorption-desorption circulation, good uranium absorption performance can still be kept, and the composite membrane material can be widely applied to uranium extraction in seawater or uranium-containing wastewater and uranium-containing wastewater treatment.

Description

technical field [0001] The invention relates to a membrane material, in particular to an antibacterial, high-strength, ultra-thin composite membrane material with uranium adsorption function, and a preparation method thereof, which belongs to the technical field of uranium resource recovery. Background technique [0002] The use of fossil energy will emit a large amount of carbon dioxide and other harmful gases, which will cause the greenhouse effect and environmental pollution. With the improvement of people's awareness of environmental protection, nuclear energy, as a mature and efficient new energy source, has become an increasingly important way of obtaining energy. However, extracting uranium from land-based uranium ore as nuclear fuel will cause water pollution and pose a certain threat to the environment. Therefore, exploring new environmentally friendly uranium adsorbents is an urgent need for efficient uranium mining and recovery of uranium from uranium-containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/12B01D67/00B01J20/26B01J20/28B01J20/30C02F1/44C02F1/50C02F1/28C02F103/08
CPCB01D69/02B01D69/125B01D67/0011B01J20/262B01J20/28033B01J20/3085B01J20/3007C02F1/44C02F1/50C02F1/288B01D2325/48B01D2325/24B01D2325/36C02F2103/08C02F2101/006Y02A20/131
Inventor 马春新孙烨王宁温顺喜王佳文陈琳
Owner HAINAN UNIVERSITY
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