How Activated Carbon Air Filters Work
Activated carbon air filters are made up of a vast matrix of molecular-sized pores. These pores are highly absorbent, chemically bonding to odorous, gaseous, and liquid contaminates.
Activated carbon is a charcoal treated with oxygen. This process opens millions of tiny pores between the carbon atoms, resulting in a highly adsorbent material.
Today's usual activated carbons are made from coal, peat, coconut shells, and wood. Working like charcoal "sponges," they adsorb from the air or water many types of organic compounds—like benzene, toluene, and acetonitrile, as well as metals such as lead.
Activation opens millions of microscopic pores in the carbonized shells, enabling them to hold onto chemical molecules like benzene. Another step, called oxidation, confers a negative charge to the shells that helps capture metal ions, such as those in solution.
Today's activated carbons are so porous that
a single gram can have over 900 square meters of surface area. A pound can have up to 465,000 square meters—owing to the materials' micro-, meso-, and macro-sized pores.
You can learn more about activated carbon on the
USDA website.
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Activated Carbon has been shown to remove:
Acetaldehyde
Cyclohexanol
Hydrogen fluoride
Paint & redecorating odors
Acetic Acid
Cyclohexanol
Hydrogen iodide
Palmitic Acid
Acetic anhydride
Cyclohexene
Hydrogen selenide
Paradichlorbenzine
Acetone
Decane
Hydrogen sulfide
Pantane
Dibromoethane
Incensen
Pentanone
Acrolem
Dichlorobenzene
Indole
Pentylene
Acrylic Acid
Dichlorodifluoromethane
Iodine
Pentyne
Acrylonitrile
Dichloroethane
Iodoform
Perchloroethylene
Alcoholic Beverages
Dichloroethylene
Irritants
Perfumes, cosmetics
Amines
Dichloroethyl
Isophorone
Phenol
Ammonia
Dichloromonofluormethane
Isoprene
Phosgene
Ameyl acetate
Dichloronitroethane
Isopropyl acetate
Pitch
Amyl alcohol
Dichloroprpane
Isopropyl alcohol
Poison gases
Amyl ether
Dichlorotetrafluoroethane
Isopropyl ether
Pollen
Aniline
Diesel fumes
Kerosene
Poultry odors
Asphalt fumes
Diethylamine
Kitchen odors
Propane
Automobile Exhaust
Diethyl ketone
Lactic acid
Propionaldehyde
Benzene
Dimethylaniline
Dimethylsulfate
Propionic acid
Body odors
Dimethylsulfate
Menthol
Propyl acetate
Borane
Carbon disulfide
Fertilizer
Monochlorobenzene
Styrene monomer
Carbon dioxide
Film processing odors
Monofluorotri cloromethane
Sulfur dioxide
Carbon tetrachloride
Fish odors
Naphtha
Sulfur trioxide
Cellosolve
Floral scents
Naphthziene
Sulfuric acid
Cellosolve acetate
Fluorotrichloromethane
Nitric acid
Tetrachloroethane
Cheese
Formaldehyde
Nitro benzenes
Tetrachloroethylene
Chlorine
Formic acid
Nitroethane
Tobacco smoke odor
Chlorobenzene
Gangrene
Nitrogen dioxide
Toilet odors
Chlorobutadiene
Garlic
Nitroglycerine
Toluene
Chloroform
Gasoline
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Dioxane
Mercaptans
Propyl alcohol
Bromine
Diproyl ketone
Methil acetate
Propyl chloride
Burned Flesh
Ether
Menthyl acrylate
Propyl ether
Burned Food
Ethyl acetate
Methyl alcohol
Propyl mercaptan
Butadiene
Ethyl acrylate
Methyl bromide
Methyl bromide
Butane
Ethyl alcohol
Methyl butyl ketone
Propylene
Butanone
Ethyl amine
Methyl cellosolve
Propyne
Butyl acetate
Ethyl benzene
Methyl cellosolve acetate
Putrefying substances
Butyl alcohol
Ethyl bromide
Methyl chloride
Putrescine
Butyl cellosolve
Ethyl chloride
Methyl chloroform
Pyridine
Butyl chloride
Ethyl ether
Methyl ether
Resins
Butyl ether
Ethyl formate
Methyl ethyl ketone
Rubber
Butylene
Ethyl mercaptan
Methyl formate
Sauerkraut
Butyne
Ethyl silicate
Methyl isobutyl ketone
Sewer odors
Butyraldehyde
Ethylene chlorhydrin
Methyl mercaptan
Skalote
Butyric acid
Ethylene dichloride
Methylcyclohexane
Slaughtering odors
Camphor
Ethylene oxide
Methylcyclohexanol
Smog
Caprylic acid
Essential oils
Methylcyclohexaone
Sour milks
Carbolic acid
Eucalyptole
Methylene chloride
Stoddard solvent
Nitromethane
Toluidine
Chloronitropropane
Heptane
Nitropropane
Trichlorethylene
Chloropicrin
Heptylene
Nitrotoluene
Trichloroethane
Citrus and other fruits
Hexane
Nonane
Turpentine
Cleaning compounds
Hexylene
Octalene
Urea
Coal smoke
Hexyne
Octane
Uric acid
Creosote
Organic Chemicals
Onions
Valeric acid
Cresol
Hydrogen bromide
Varnish fumes
Valericaldehyde
Crotonaldehyde
Hydrogen chloride
Ozone
Xylene
Cychlohexane
Hydrogen cyanide
Packing house odors
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