A recyclable fluorescence sensor for Hg2+ and Zn2+, based on rhodamine 6G(R6G) and 8-aminoquinoline(8-AQ) co-modified core/shell Fe3O4@Si O2 nanoparticles(denoted as R6G/8-AQ co-functionalized Fe3O4@Si O2 NPs), was de...A recyclable fluorescence sensor for Hg2+ and Zn2+, based on rhodamine 6G(R6G) and 8-aminoquinoline(8-AQ) co-modified core/shell Fe3O4@Si O2 nanoparticles(denoted as R6G/8-AQ co-functionalized Fe3O4@Si O2 NPs), was developed. R6 G derivative and 8-AQ derivative were conjugated onto the water-soluble core/shell Fe3O4@Si O2 nanoparticles(NPs) by covalent interaction. The R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs showed fluorescence emission bands at 548 and 480 nm. When the R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs were coordinated with Hg2+ and Zn2+, emission intensity at 548 nm increased with [Hg2+], while that at 480 nm increased with [Zn2+]. Moreover, there existed approximate linear relationships between fluorescence intensities and concentration of metal ions, in the range of 4.0×10-9–7.65×10-8 M for Hg2+ and 3.3×10-9–3.96×10-8 M for Zn2+, respectively. The lower detection limits for Hg2+ and Zn2+ were 1.0×10-9 and 3.0×10-9 M, respectively. The R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs showed good selectivity to Hg2+ and Zn2+ over other common metal ions examined in neutral aqueous solutions. Moreover, the R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs could be recycled from the detected samples using a magnet. This work has thus showed not only a practical sensing method for Zn2+ and Hg2+, but also a promising guide to the design of fluorimetric/colorimetric sensors for other targets.展开更多
基金supported by the National Key Basic Research Program of China (2013CB934304)the National Natural Science Foundation of China (21307138, 11274312, 11175204 and 51472245)the State Administration of Foreign Experts Affairs of Chinese Academy International Partnership Program for Creative Research Teams, and the President Foundation of Hefei Institutes of Physical Science, Chinese Academy of Sciences (YZJJ201312)
文摘A recyclable fluorescence sensor for Hg2+ and Zn2+, based on rhodamine 6G(R6G) and 8-aminoquinoline(8-AQ) co-modified core/shell Fe3O4@Si O2 nanoparticles(denoted as R6G/8-AQ co-functionalized Fe3O4@Si O2 NPs), was developed. R6 G derivative and 8-AQ derivative were conjugated onto the water-soluble core/shell Fe3O4@Si O2 nanoparticles(NPs) by covalent interaction. The R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs showed fluorescence emission bands at 548 and 480 nm. When the R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs were coordinated with Hg2+ and Zn2+, emission intensity at 548 nm increased with [Hg2+], while that at 480 nm increased with [Zn2+]. Moreover, there existed approximate linear relationships between fluorescence intensities and concentration of metal ions, in the range of 4.0×10-9–7.65×10-8 M for Hg2+ and 3.3×10-9–3.96×10-8 M for Zn2+, respectively. The lower detection limits for Hg2+ and Zn2+ were 1.0×10-9 and 3.0×10-9 M, respectively. The R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs showed good selectivity to Hg2+ and Zn2+ over other common metal ions examined in neutral aqueous solutions. Moreover, the R6G/8-AQ co-functionalized core/shell Fe3O4@Si O2 NPs could be recycled from the detected samples using a magnet. This work has thus showed not only a practical sensing method for Zn2+ and Hg2+, but also a promising guide to the design of fluorimetric/colorimetric sensors for other targets.
