Amino-Functionalized Metal-Organic Frameworks Nanoplates-Based Energy Transfer Probe for Highly Selective Fluorescence Detection of Free Chlorine
2016
Lu, Ting | Zhang, Lichun | Sun, Mingxia | Deng, Dongyan | Su, Yingying | Lv, Yi
Novel highly fluorescent NH₂-MIL-53(Al) was controllably synthesized by a facile one-step hydrothermal treatment of AlCl₃·6H₂O and NH₂-H₂BDC in water with urea as a modulator. The as-synthesized NH₂-MIL-53(Al) nanoplates exhibited excellent water solubility and stability. In the present work, it can be found that strong fluorescence of NH₂-MIL-53(Al) nanoplates was significantly suppressed after the addition of free chlorine, and a simple sensing system for fast, highly selective direct detection of free chlorine in water was established. Compared with other fluorescent sensors for free chlorine, the present methodology has a comparable detection limit of 0.04 μM (S/N = 3) and a wide detection range of 0.05 to 15 μM. On the other hand, the traditional redox-based fluorescent probes sharply suffered from the interference of MnO₄–, Cr₂O₇²–, and other oxidants with stronger oxidation capability than free chlorine while ours overcame this disadvantage. Further research suggests that it is more likely the energy transfer through N–H···O–Cl hydrogen bonding interaction between amino group and ClO– ions plays the key role in our system, providing a new and promising platform for free chlorine determination in water quality monitoring.
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