Fluorescence detection of phosphate in an aqueous environment by an aluminum-based metal-organic framework with amido functionalized ligands

Peng Li1,2, Lingqian Dong1,2, Han Jin3, Jingren Yang1, Yonghui Tu1, Chao Wang1,2, Yiliang He1,2
1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
2China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai, China
3Department of Instrument Science and Engineering School of Electronic, Information and Electrical Engineering Shanghai Jiao Tong University, Shanghai, China

Tóm tắt

The on-site monitoring of phosphate is important for environmental management. Conventional phosphate detection methods are not appropriate to on-site monitoring owing to the use of complicated detection procedures, and the consequent high cost and maintenance requirements of the detection apparatus. Here, a highly sensitive fluorescence-based method for phosphate detection with a wide detection range was developed based on a luminescent aluminum-based metal-organic framework (Al-MOF). The Al-MOF was prepared by introducing amine functional groups to conventional MIL to enhance phosphate binding, and exhibited excellent fluorescence properties that originated from the ligand-to-metal charge transfer (LMCT). The detection limit was as low as 3.25 µmol/L (0.10 mg/L) and the detection range was as wide as 3–350 µmol/L (0.10–10.85 mg/L). Moreover, Al-MOF displayed specific recognition toward phosphate over most anions and metal cations, even for a high concentration of the co-existent ions. The mechanism of phosphate detection was analyzed through the characterization of the combination of Al-MOF and phosphate, and the results indicated the high affinity between Al-O and phosphate inhibited that the LMCT process and recovered the intrinsic fluorescence of NH2−H2BDC. The recovery of the developed detection method reached a satisfactory range of 85.1%–111.0%, and the feasibility of on-site phosphate detection was verified using a prototype sensor for tap water and lake water samples. It was demonstrated that the prepared Al-MOF is highly promising for on-site detection of phosphate in an aqueous environment.

Tài liệu tham khảo

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