Interlayer Nanoconfinement Enhanced Peroxymonosulfate Activation for Nanozyme-Mediated Colorimetric Detection

Area of Science:

• Materials Science
• Analytical Chemistry
• Environmental Science

Background:

• Designing high-performance nanozymes is challenging due to the complex relationship between nanoconfinement and catalytic activity.
• Understanding interfacial charge transfer mechanisms is crucial for optimizing nanozyme sensors.

Purpose of the Study:

• To develop a nanoconfinement sensor (NCS) for improved colorimetric-catalytic performance.
• To elucidate the electron transfer mechanism within nanoconfinement interlayers.
• To achieve ultrasensitive detection of 2-aminoresorcinol (2-ARS).

Main Methods:

• Anchoring iron-cobalt layered double hydroxides (FeCo LDH) onto active carbon substrates to create the NCS.
• Investigating nanoconfinement interlayer effects on peroxymonosulfate (PMS) adsorption.
• Utilizing theoretical calculations to identify optimal interaction configurations.
• Employing smartphone-assisted readout for real-time monitoring.

Main Results:

• An optimal nanoconfinement interlayer of 0.94 nm was identified, enhancing PMS adsorption energy.
• The NCS-activated PMS system achieved a low limit of detection (LOD) of 0.17 μM for 2-ARS.
• Parallel aromatic π-π stacking configurations showed optimal adsorption energy and stability.
• A 2.6-fold improvement in activation efficiency was observed compared to hydrogen peroxide.

Conclusions:

• The developed NCS effectively decodes interfacial charge transfer mechanisms for enhanced nanozyme performance.
• The sensor provides a highly sensitive, user-friendly, and accessible platform for environmental monitoring of 2-ARS.
• This approach offers significant potential for real-time, high-precision environmental detection.