Promoting Active Sites in MOF-Derived Homobimetallic Hollow Nanocages as a High-Performance Multifunctional Nanozyme Catalyst for Biosensing and Organic Pollutant Degradation

  • Siqi Li
    Siqi Li
    The Key Laboratory of Luminescence and Real-time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
    More by Siqi Li
  • Yuejie Hou
    Yuejie Hou
    The Key Laboratory of Luminescence and Real-time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
    More by Yuejie Hou
  • Qiumeng Chen
    Qiumeng Chen
    The Key Laboratory of Luminescence and Real-time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
    More by Qiumeng Chen
  • Xiaodan Zhang
    Xiaodan Zhang
    The Key Laboratory of Luminescence and Real-time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
  • Haiyan Cao*
    Haiyan Cao
    The Key Laboratory of Chongqing Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
    *E-mail: [email protected]. Phone/Fax: +86 23 72793565 (H.C.).
    More by Haiyan Cao
  • , and 
  • Yuming Huang*
    Yuming Huang
    The Key Laboratory of Luminescence and Real-time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
    *E-mail: [email protected]. Phone/Fax: +86 23 68254843(Y.H.).
    More by Yuming Huang
Cite this: ACS Appl. Mater. Interfaces 2020, 12, 2, 2581–2590
Publication Date (Web):December 19, 2019
Copyright © 2019 American Chemical Society
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Nanozymes are one of the ideal alternatives to natural enzymes for various applications. The rational design of nanozymes with improved catalytic activity stimulates increasing attention to address the low activity of current nanozymes. Here, we reported a general strategy to fabricate the Co-based homobimetallic hollow nanocages (HNCs) (C–CoM–HNC, M = Ni, Mn, Cu, and Zn) by ion-assistant solvothermal reaction and subsequent low-temperature calcination from metal–organic frameworks. The C–CoM–HNCs are featured with HNCs composed of interlaced nanosheets with homogeneous bimetallic oxide dispersion. The hierarchical structure and secondary metallic doping endow the C–CoM–HNC highly active sites. In particular, the Cu-doped C–CoCu–HNCs nanostructures exhibit superior performances over the other C–CoM–HNC as both the oxidase mimicking and peroxymonosulfate (PMS) activator. A sensitive bioassay for acetylcholinesterase (AChE) was established based on the excellent oxidase-like activity of C–CoCu–HNC, offering a linear detection range from 0.0001 to 1 mU/mL with an ultralow detection limit of 0.1 mU/L. As the PMS activator, the C–CoCu–HNC was applied for targeted organic pollutant (rhodamine B, RhB) degradation. A highly efficient RhB degradation was realized, along with good adaptability in a wide pH range and good reusability during the eight-cycle run. The results suggest that C–CoCu–HNC holds a practical potential for clinical diagnostics and pollution removal. Further density functional theory calculation reveals that Cu doping leads to a tighter connection and more negative adsorption energy for O2/PMS, as well as an upshifted d-band center in the C–CoCu–HNCs nanostructures. These changes facilitated the adsorption of O2/PMS on the C–CoCu–HNC surface for dissociation. This work not only offers a promising multifunctional nanozyme catalyst for clinical diagnostics and pollution removal but also gives some clues for the further development of novel nanozymes with high catalytic activities.

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  • Experimental details, materials characterization, DFT calculations, region and kinetic parameters, Comparison of different strategies for AChE assay, determination results of erythrocyte AChE activity, crystal structure of the CoM-ZIFs precursor, XRD patterns, optical photographs, thermogravimetric curve, TEM, HRTEM, SAED pattern, double-reciprocal plots, effects of pH and temperature, variation of catalytic activity, reusability, differential charge density map, and calculated density of states (PDF)

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