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Related Experiment Video

Updated: Jul 11, 2025

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Mid-IR Light-Activatable Full Spectrum LaB6 Plasmonic Photocatalyst.

Kuo Chu Hwang1, Payal Banerjee1, Munusamy Shanmugam1

  • 1Department of Chemistry, National Tsing Hua University, Hsinchu, 30013, Taiwan.

Advanced Materials (Deerfield Beach, Fla.)
|November 2, 2023
PubMed
Summary

A novel lanthanum hexaboride (LaB6) photocatalyst can disinfect bacteria and degrade pollutants using mid-infrared light, even at night. This breakthrough offers a sustainable solution for public health and environmental safety without external light sources.

Keywords:
LaB6 nanoparticlesmid-infrared photocatalystmultidrug resistant bacteriaphoto disinfectionthermal radiation photocatalyst

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Area of Science:

  • Materials Science
  • Environmental Science
  • Nanotechnology

Background:

  • Photocatalysts are needed for disinfection in public spaces.
  • Existing photocatalysts require UV-vis-near-infrared (NIR) light and fail at night.
  • A light-independent disinfection method is crucial for continuous operation.

Purpose of the Study:

  • To develop a novel photocatalyst for disinfection and pollutant degradation.
  • To overcome the light-activation limitations of current photocatalysts.
  • To utilize readily available mid-infrared (mid-IR) light for photocatalysis.

Main Methods:

  • Synthesis of a lanthanum hexaboride (LaB6) plasmonic photocatalyst.
  • Testing its ability to absorb UV-vis-NIR and mid-IR light.
  • Evaluating its efficiency in water splitting, hydrogen generation, and organic pollutant decomposition.
  • Assessing its efficacy in killing multidrug-resistant Escherichia coli bacteria.

Main Results:

  • The LaB6 photocatalyst absorbs UV-vis-NIR and mid-IR light (≈2-50 µm).
  • It effectively splits water to produce hydrogen and hydroxyl radicals.
  • It decomposes organic pollutants and kills multidrug-resistant E. coli.
  • Mid-IR light is available from natural thermal radiation sources.

Conclusions:

  • LaB6 is an unprecedented photocatalyst functioning without external light.
  • It offers a long-lasting, benign solution for disinfection and environmental remediation.
  • This technology enables continuous nighttime operation using ambient thermal radiation.