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Title: Rhodamine derivative-modified filter papers for colorimetric and fluorescent detection of Hg2+ in aqueous media
Authors: Xu, L.Q.
Neoh, K.-G. 
Kang, E.-T. 
Fu, G.D.
Issue Date: 21-Feb-2013
Citation: Xu, L.Q., Neoh, K.-G., Kang, E.-T., Fu, G.D. (2013-02-21). Rhodamine derivative-modified filter papers for colorimetric and fluorescent detection of Hg2+ in aqueous media. Journal of Materials Chemistry A 1 (7) : 2526-2532. ScholarBank@NUS Repository.
Abstract: 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 (
Source Title: Journal of Materials Chemistry A
ISSN: 20507488
DOI: 10.1039/c2ta01072k
Appears in Collections:Staff Publications

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