Yan Haokai, Kou Zhenhui, Li Shengxu, Zhang Tao
Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China.
Small. 2023 Aug;19(35):e2207972. doi: 10.1002/smll.202207972. Epub 2023 May 2.
sp carbon-conjugated covalent organic framework (sp c-COF) featured with high π-conjugation, high chemical stabilities, and designable chemical structures, are thus promising for applications including adsorption and separation, optoelectronic devices, and catalysis. For the most of these applications, large-area and continuous films are required. However, due to the needs of harsh conditions in the formation of CC bonds, classical interfacial methodologies are challenged in the synthesis of sp c-COFs films. Herein, a novel and robust interfacial method namely copper-surface-mediated Knoevenagel polycondensation (Cu-SMKP), is shown for scalable synthesis of sp c-COF films on various Cu substrates. Using this approach, large-area and continuous sp c-COF films could be prepared on various complicated Cu surfaces with thickness from tens to hundreds of nanometers. The resultant sp c-COF films on Cu substrate could be used directly as functional electrode for extraction of uranium from spiked seawater, which gives an exceptionally uptake capacity of 2475 mg g . These results delineate significant synthetic advances in sp c-COF films and implemented them as functional electrodes for uranyl capture.
具有高π共轭、高化学稳定性和可设计化学结构的sp碳共轭共价有机框架（sp c-COF），因此在吸附与分离、光电器件和催化等应用方面具有广阔前景。对于这些应用中的大多数而言，需要大面积且连续的薄膜。然而，由于形成CC键需要苛刻的条件，传统的界面方法在合成sp c-COF薄膜时面临挑战。在此，展示了一种新颖且稳健的界面方法，即铜表面介导的克诺文纳格尔缩聚反应（Cu-SMKP），用于在各种铜基底上可扩展地合成sp c-COF薄膜。使用这种方法，可以在各种复杂的铜表面上制备大面积且连续的sp c-COF薄膜，其厚度从几十到几百纳米不等。在铜基底上得到的sp c-COF薄膜可直接用作从加标海水中提取铀的功能电极，其吸附容量高达2475 mg g 。这些结果表明了sp c-COF薄膜在合成方面取得的重大进展，并将其用作铀酰捕获的功能电极。
