Cu-Based Metal-Organic Framework Nanoparticles for Sensing Cr(VI) Ions

Wei Shi, Mengqi He, Weitao Li, Xing Wei, Brian Bui, Mingli Chen*, Wei Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

A nanoscale MOF-199 was synthesized in a simple and fast way by mixing btc triethylammonium and copper nitrate solution at room temperature and characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, and X-ray diffraction. The mimicking enzyme activity and the steady-state kinetics of the nanozyme were investigated. The prepared MOF-199 was a uniformly nanosized octahedron, and it exhibited excellent Cr(VI)-activated oxidoreductase catalytic properties. MOF-199 was employed as a catalyst; in 5 min, 3,3′,5,5′-tetramethylbenzidine (TMB) was oxidized by Cr(VI) into a bluish and oxidized TMB, which was recorded by UV-vis spectroscopy, and the mechanism was discussed. It facilitated the sensing of Cr(VI), and a linear range of 0.1-30 μM was obtained with a limit of detection of 20 nM. The selectivity of the present method for Cr(VI) was excellent, and its application to environmental water samples was accomplished.

Original languageEnglish
Pages (from-to)802-810
Number of pages9
JournalACS Applied Nano Materials
Volume4
Issue number1
DOIs
Publication statusPublished - 22 Jan 2021
Externally publishedYes

Keywords

  • Cr(VI)
  • MOF-based nanozyme
  • nanozyme probe
  • oxidoreductase-like
  • sensing

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