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

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 ...

AI Technical Summary

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

Images