Preparation Of Anti-biofouling Amidoxime-based Materials And The Properties For Uranium Extraction From Seawater

Ocean,an inexhaustible reservoir of resources,contains 4.5 billion tons of uranium.If the uranium in seawater could be effectively exploited,it will not only provide a large amount of raw materials for nuclear power generation,but also play a huge role in ensuring national energy security,and enhancing people’s confidence in the sustainable development of nuclear energy.However,there are two main difficulties in the industrial-scale mining of uranium extraction from seawater: the low concentration of uranium,and the biological attachment of marine organisms to the seawater material.Therefore,it is particularly significant to develop new materials towards uranium extraction from seawater,which could effectively extract low content uranium from the complex coexisting ions,as well as avoid the interference of biofouling.In this study,two porous materials,with both adsorption and antibacterial properties,silver-loaded amidoximated polyacrylonitrile porous nanofibers（Ag@AOPAN PNF）and zinc-loaded amidoximated polyacrylonitrile porous microcapsule resin（Zn@AO-PAN PMR）were designed by using polyvinylpyrrolidone as porogen,nanosilver/ zinc as antibacterial agents respectively,and amidoxime group as the characteristic adsorption group towards uranium.Adsorption mechanism and the factors which could influence the adsorption behavior of the materials have also been investigated in real seawater spiked with uranium.The research results show that the adsorption thermodynamic models of these two materials are consistent with the Langmuir model,in which the maximum adsorption capacity of Ag@AO-PAN PNF is 34.17 mg/g,and the maximum adsorption capacity of Zn@AO-PAN PMR is 50.30 mg/g.indicating that these two adsorption materials all have strong adsorption properties.At the same time,the ion selectivity experiment showed that both materials have good selectivity for U（Ⅵ）.The study on the antibacterial properties shows that these two materials all have certain anti-biological adhesion properties,which could inhibit the growth of bacteria by promoting the formation of ROS in bacteria.