Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 7, Pages 2526-2532Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ta01072k
Keywords
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Funding
- National Environmental Agency of Singapore under ETRP [0910 149]
- National Environmental Agency of Singapore (NUS WBS) [R279-000-314-490]
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Mercury pollution is a widespread problem. In this work, a solid-state sensor based on rhodamine derivative-modified cellulose filter papers for detection of Hg2+ ions in aqueous media is demonstrated. A three-step approach, involving the introduction of atom transfer radical polymerization (ATRP) initiating sites, surface-initiated ATRP (SI-ATRP) of pentafluorophenyl methacrylate, and post-functionalization of the reactive surface with amino-containing spirolactam rhodamine derivatives in ester-amine reaction, was developed for the covalent immobilization of mercury-responsive probes on the cellulose filter paper. This solid-state sensor exhibits highly selective recognition of Hg2+ ions in a Tris-HNO3 buffer solution (pH = 7.24) over various environmentally relevant metal ions with remarkably enhanced fluorescent emission intensity and distinct color change from colorless to pink. The response of a rhodamine derivative-modified cellulose filter paper to Hg2+ ions is fast (<2 min). The positive fluorescence response and color change of this functionalized filter paper thus provide a disposable solid-state sensor for fluorescent and naked-eye detection of Hg2+ ions.
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