Abstract
A copolymer poly(NIPAM-co-RD) consisting of N-isopropylacrylamide (NIPAM) and N-tripodal rhodamine 6G units (RD) as the thermoresponsive and sensing parts, respectively, has been prepared. At room temperature, the copolymer is fully dissolved in water and it could be used as a highly sensitive and selective fluorescent sensor for Hg2+ in a wide range of pH from 5.0 to 10.0. The non-fluorescent copolymer showed a significant fluorescence enhancement in the presence of Hg2+ over other competitive metal ions. It works based on the Hg2+ induced ring-opening of the rhodamine units. The detection limit was as low as 2.25×10−8M. Upon heating above the lower critical solution temperature (LCST), the copolymer may collapse and form aggregates, therefore the copolymer containing Hg2+ could be separated from water by centrifugation at high temperature. In addition, the separated copolymer with Hg2+ could be treated by sodium sulfide, and the original copolymer was successfully regenerated and then reused for further Hg2+ sensing.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
