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How does active carbon filters work?

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engineheat:
I wonder how the active carbon filters found in respirators work. How are they built/designed to filter air while allowing air to pass through? Are the carbon particles suspended in a membrane? Or are the carbon particles packed into a tube that air flows through?
Thanks

thm_w:
https://science.howstuffworks.com/gas-mask2.htm
https://en.wikipedia.org/wiki/Carbon_filtering
https://molekule.science/activated-carbon-air-filter/

Alex Eisenhut:
https://en.wikipedia.org/wiki/Adsorption

That's the principle.

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