A Class of Materials Called Photocatalysts Can Break Down Common Toxic Pollutants, Research Shows
Briefly

Photocatalysts can decompose common toxic pollutants when activated by light, generating reactive oxygen species that bond with pollutants, turning them into harmless products.
Some photocatalysts can't initiate reactions with low-energy light, and the charged particles involved can recombine too quickly, hindering effective pollutant breakdown.
Read at Inverse
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