Now, if an activated carbon filter is used on an air purifier in combination with a HEPA filter, then the activated carbon air filter can also work as a pre-filter. You can think of it like this: adsorption is best used for air filtration while absorption is better for liquids. Whereas with absorption, contaminants are absorbed inside the structure itself, like a sponge. ![]() The difference between those two terms is that during adsorption the contaminants stick to the outside of the carbon substrate.
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