title: Thioether-Based Fluorescent Covalent Organic Framework for Selective Detection and Facile Removal of Mercury(II).
abstract: Heavy metal ions are highly toxic and widely spread as environmental pollutants. New strategies are being developed to simultaneously detect and remove these toxic ions. Herein, we take the intrinsic advantage of covalent organic frameworks (COFs) and develop fluorescent COFs for sensing applications. As a proof-of-concept, a thioether-functionalized COF material, COF-LZU8, was "bottom-up" integrated with multifunctionality for the selective detection and facile removal of mercury(II): the π-conjugated framework as the signal transducer, the evenly and densely distributed thioether groups as the Hg(2+) receptor, the regular pores facilitating the real-time detection and mass transfer, together with the robust COF structure for recycle use. The excellent sensing performance of COF-LZU8 was achieved in terms of high sensitivity, excellent selectivity, easy visibility, and real-time response. Meanwhile, the efficient removal of Hg(2+) from water and the recycling of COF-LZU8 offers the possibility for practical applications. In addition, X-ray photoelectron spectroscopy and solid-state NMR investigations verified the strong and selective interaction between Hg(2+) and the thioether groups of COF-LZU8. This research not only demonstrates the utilization of fluorescent COFs for both sensing and removal of metal ions but also highlights the facile construction of functionalized COFs for environmental applications.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China.
authors.forename: San-Yuan
authors.initials: SY
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China.
authors.forename: Ya-Wen
authors.initials: YW
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China.
authors.forename: Yan-Tao
authors.initials: YT
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China.
authors.forename: Huai-Zhen
authors.initials: HZ
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors.forename: Cheng-Yong
authors.initials: CY
authors.lastname: Su
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China.|Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D002413:Cations, Divalent / Q000032:analysis / Q000302:isolation & purification; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D006835:Hydrazones / Q000138:chemical synthesis / Q000737:chemistry; D046911:Macromolecular Substances / Q000138:chemical synthesis / Q000737:chemistry; D008279:Magnetic Resonance Imaging; D008628:Mercury / Q000032:analysis / Q000302:isolation & purification*; D056951:Photoelectron Spectroscopy; D013440:Sulfides / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D005456:Fluorescent Dyes; D006835:Hydrazones; D046911:Macromolecular Substances; D013440:Sulfides; D008628:Mercury