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Batch and Flow Synthesis of CeO2 Nanomaterials Using Solid-State Microwave Generators.

Cristina Rodríguez-Carrillo1, Juan Torres García1, Miriam Benítez1

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Summary

We developed a rapid microwave-assisted synthesis for cerium oxide nanoparticles (CeO2). This sustainable method, adapted for flow chemistry, yields materials with peroxidase properties for reactive oxygen species (ROS) scavenging.

Keywords:
CeO2flow chemistrymicrowave-assisted synthesisnanoparticlesolid-state generator

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Microwave-assisted synthesis and flow chemistry offer efficient routes for nanomaterial preparation.
  • Solid-state microwave generators provide enhanced control over synthesis parameters.
  • Cerium oxide (CeO2) is a promising catalyst, but its synthesis via these advanced methods is underexplored.

Purpose of the Study:

  • To develop a rapid and sustainable method for synthesizing cerium oxide nanoparticles (CeO2) using microwave irradiation.
  • To adapt the synthesis procedure for flow chemistry applications.
  • To evaluate the properties of the synthesized CeO2 for potential applications, such as reactive oxygen species (ROS) scavenging.

Main Methods:

  • Microwave-assisted synthesis of CeO2 nanoparticles (approx. 4 nm) using a 2.45 GHz solid-state generator in 30 seconds.
  • Calcination at 800 °C to improve particle size and crystallinity.
  • Characterization using Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Dynamic Light Scattering (DLS), and N2 adsorption-desorption.
  • Adaptation of the synthesis to a flow chemistry setup.

Main Results:

  • Successfully synthesized nanoparticulated CeO2 (approx. 4 nm) in 30 seconds via microwave irradiation.
  • Calcination resulted in larger, highly crystalline CeO2 particles (approx. 40 nm) forming aggregates (approx. 100 nm).
  • XRD confirmed a fluorite-like crystalline structure for the CeO2.
  • Flow synthesis yielded materials with properties comparable to batch synthesis.
  • Synthesized CeO2 exhibited peroxidase-like activity.

Conclusions:

  • A fast, sustainable microwave-assisted batch and flow synthesis for cerium oxide nanoparticles was established.
  • The synthesized CeO2 nanoparticles possess desirable structural and crystalline properties.
  • The materials demonstrate peroxidase activity, indicating potential as reactive oxygen species (ROS) scavengers.