Dansyl-containing boronate hydrogel film as fluorescent chemosensor of copper ions in water
- 14 May 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in RSC Advances
- Vol. 2 (16), 6555-6561
- https://doi.org/10.1039/c2ra20516e
Abstract
A new type of boronate hydrogel with covalently bound dansyldiethylenetriamine as an indicator has been developed; the gel networks are based on boronate esterification of poly(vinylalcohol) with benzene-1,4-diboronic acid. In this approach, phenylboronic acid-appended N-dansyldiethylenetriamine 1 was newly synthesized to be incorporated into the gel matrix. The resulting gel film showed an absorption band at 336 nm and fluorescence at 511 nm when excited at 340 nm in water. The fluorescence measurements indicated that at neutral conditions using a HEPES buffer, the gel film was selectively quenched after immersion in an aqueous solution of Cu2+ for 30 min. The response had minimal interference from other metal ions such as Na+, K+, Mg2+, Ca2+, Fe3+, Co2+, Ni2+, Zn2+, Cd2+, Hg2+, Al3+, and Pb2+, which was noteworthy because dansyldiethylenetriamine alone responds to Hg2+ and Ni2+ in addition to Cu2+ in water. The reversible sensing capability was also evaluated by rinsing the film with an aqueous solution of ethylenediaminetetraacetic acid (EDTA). The gel was found to be a reusable and free-standing film capable of visually detecting Cu2+, providing a simple and expedient tool for on-site monitoring of Cu2+ in environmental applications such as water analysis.This publication has 81 references indexed in Scilit:
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