• 文献标题:   Graphene Nanobeacons with High-Affinity Pockets for Combined, Selective, and Effective Decontamination and Reagentless Detection of Heavy Metals
  • 文献类型:   Article
  • 作  者:   PANACEK D, ZDRAZIL L, LANGER M, SEDAJOVA V, BAD URA Z, ZOPPELLARO G, YANG QY, NGUYEN EP, ALVAREZDIDUK R, HRUBY V, KOLARIK J, CHALMPES N, BOURLINOS AB, ZBORIL R, MERKOCI A, BAKANDRITSOS A, OTYEPKA M
  • 作者关键词:   carboxylation, heavy metal, nitrogendoped graphene acid, paperbased sensor, sensing, sorption
  • 出版物名称:   SMALL
  • ISSN:   1613-6810 EI 1613-6829
  • 通讯作者地址:  
  • 被引频次:   5
  • DOI:   10.1002/smll.202201003 EA JUL 2022
  • 出版年:   2022

▎ 摘  要

Access to clean water for drinking, sanitation, and irrigation is a major sustainable development goal of the United Nations. Thus, technologies for cleaning water and quality-monitoring must become widely accessible and of low-cost, while being effective, selective, sustainable, and eco-friendly. To meet this challenge, hetero-bifunctional nanographene fluorescent beacons with high-affinity pockets for heavy metals are developed, offering top-rated and selective adsorption for cadmium and lead, reaching 870 and 450 mg g(-1), respectively. The heterobifunctional and multidentate pockets also operate as selective gates for fluorescence signal regulation with sub-nanomolar sensitivity (0.1 and 0.2 nm for Pb2+ and Cd2+, respectively), due to binding affinities as low as those of antigen-antibody interactions. Importantly, the acid-proof nanographenes can be fully regenerated and reused. Their broad visible-light absorption offers an additional mode for water-quality monitoring based on ultra-low cost and user-friendly reagentless paper detection with the naked-eye at a limit of detection of 1 and 10 ppb for Pb2+ and Cd2+ ions, respectively. This work shows that photoactive nanomaterials, densely-functionalized with strong, yet selective ligands for targeted contaminants, can successfully combine features such as excellent adsorption, reusability, and sensing capabilities, in a way to extend the material's applicability, its life-cycle, and value-for-money.