Fluorescent Sensing of Hg2+ by Phenanthroimidazole Derivative Supported on Silica Nanoparticles

doi:10.7517/issn.1674-0475.200103

Abstract

Abstract: By using tetraethoxysilane (TEOS) and diethoxydimethylsilane (DEDMS) as starting materials, two silica nanoparticles SNP1 and SNP2 are prepared. SNP1 and SNP2 are characterized using transmission electron microscopy (TEM) and dynamic light scattering (DLS). The average diameters of SNP1 and SNP2 determined from the TEM image are about 13.5 nm and 25.9 nm. Dynamic light scattering (DLS) data show that the Zeta potentials of SNP1 and SNP2 are -5.74 mV and -2.28 mV, respectively. A turn-on fluorescence probe PIP-S based on phenanthroimidazole is designed and synthesized, which can be supported on SNP1 and SNP2 to improve their water solubility. UV-Vis and fluorescence spectroscopy are employed to investigate the specific recognition of Hg²⁺ by PIP-S. The detection limit (LOD) of PIP-S toward Hg²⁺ is determined to be 1.32 nmol·L^-1 in DMF. The detection limits of PIP-S supported on SNP1 and SNP2 for Hg²⁺ in aqueous solution are 8.37 nmol·L^-1 and 14.75 nmol·L^-1, respectively. These results showed that PIP-S supported on SNP1 and SNP2 can detect Hg²⁺ with good selectivity and high sensitivity, and without the interference of other metal ions.

Key words: silica nanoparticles, mercury ion, fluorescent sensor, phenanthroimidazole

JIA Hongdan, XING Wenli, SONG Yujiao, ZHENG Shehong, GAO Yunyan, OU Zhize. Fluorescent Sensing of Hg²⁺ by Phenanthroimidazole Derivative Supported on Silica Nanoparticles[J]. Imaging Science and Photochemistry, 2020, 38(4): 601-608.

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Fluorescent Sensing of Hg²⁺ by Phenanthroimidazole Derivative Supported on Silica Nanoparticles

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