Porphyrinic MOFs for reversible fluorescent and colorimetric sensing of mercury(II) ions in aqueous phase
RSC ADVANCES(2016)
摘要
Developing an effective method that could provide simple, rapid and visual determination of Hg2+ in water has attracted great attention. In this work, a novel chemical sensor with a porphyrin-based luminescent metal-organic framework (LMOFs) which exhibited a dual-mode response to trace amounts of mercury ions (Hg2+) has been successfully constructed. The porous LMOF probe was fabricated using a simple solvothermal reaction, and assembled with Zr-O clusters as inorganic nodes and meso-tetra(4-carboxyphenyl) porphyrin (TCPP) ligands as organic bridging struts. The sensing activity was realized by using the inherent TCPP struts as recognition sites and signal reporter, which presented a specific interaction with Hg2+ over other potentially interfering metallic cations. The LMOFs which were developed exhibited a visible fluorescent quenching (bright red-dark red) and a colorimetric response (purple-light green) in the presence of Hg2+ with a response rate as rapid as 2 min. Additionally, the fluorescence quenching showed a linear correlation in the Hg2+ concentration range from 0.1 to 10 mM and the limit of detection was calculated to be 6 nM, which was in agreement with the acceptable level of Hg2+ in drinking water mandated by the United States Environmental Protection Agency. Furthermore, the sensor for Hg2+ detection was reversible after the treatment with potassium iodide solution, which suggested that it has great potential as an economical alternative for practical Hg2+ quantification in water. The easily constructed sensory probe was also applied to determine the concentration of Hg2+ in tap water to demonstrate its practical applications.
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关键词
colorimetric sensing,porphyrinic mofs,reversible fluorescent,ions,mercury<scp>ii</scp>
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