基于仿生多巴胺化学制备铀的吸附材料

    Bio-Inspired Polydopamine Chemistry Mediated Synthesis of Uranium Sorbents

    • 摘要: 铀的高效富集和分离对于核能可持续发展具有重要意义。吸附法作为一类重要的分离方法,吸附材料在其中扮演着关键角色。本文综述了近年来基于仿生多巴胺化学制备铀吸附材料的研究进展。第一部分首先介绍多巴胺化学的基本原理,着重讨论多巴胺的自聚合机理、聚集体结构及其聚合过程的控制因素;第二部分列举利用多巴胺化学表面改性制备不同类型的复合吸附材料,包括碳基纳米材料、多孔硅基材料、无机黏土矿物、金属或共价有机框架化合物、纳米高分子纤维等,探讨针对不同材料体系的多巴胺改性方法,以及对吸附材料组成、结构的影响;第三部分集中介绍多巴胺改性材料对铀的吸附性能研究,按照材料功能基团的差异,分为本征多巴胺涂层、多巴胺-无机复合涂层、多巴胺-高分子复合涂层三个方面,阐述各类材料对铀的吸附行为和机理。本文最后总结了多巴胺化学在吸附材料制备方面尚存在的挑战,并展望了本领域的发展前景。

       

      Abstract: Effective enrichment and separation of uranium is of great significance to the sustainable development of nuclear energy. In this respect, adsorption is considered one of the important methods, and sorbents play a key role in achieving efficient separation. This review introduces the research on the bio-inspired polydopamine(PDA) chemistry mediated synthesis of uranium sorbents in recent years. The first section of the article discusses the basic principle of PDA chemistry, highlighting the mechanism of selfpolymerization of dopamine, the exact structure of PDA, and the control factors to manipulate the polymerization process. The second section summarizes the diverse composite sorbents prepared by surface modification strategy based on PDA chemistry, including carbonaceous nanomaterials, porous silicas, inorganic clays, metal-organic frameworks(MOFs), covalent organic frameworks(COFs), as well as polymer nanofibers. The dopamine-assisted surface modification methods for preparing different classes of sorbents are detailed, and the influences on the composition and structure of the obtained sorbents are discussed. The third section focuses on the dopamine modified sorbents for uranium separation. For a better description, the uranium sorbents are classified to be three categories according to the differences in functional groups, i.e., intrinsic PDA coating, PDA/inorganic composite coating, and PDA/polymer composite coating. The adsorption behavior and the mechanism toward uranium are elucidated. Finally, this review identifies the challenges remaining in the area of PDA chemistry mediated synthesis of sorbents and describes the emerging trends and needs in the future.

       

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