Activated Carbon

Dec 1

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12/1/2013 12:00 AM  RssIcon

Activated CarbonThe effectiveness of activated carbon is based upon the amount of a test chemical it can absorb per unit weight of carbon. The test chemicals used for effectiveness testing of filtering air and gases is Butane; for filtering water and liquids, is Iodine in water and for wastewater odor control, is Hydrogen Sulfide. Under the microscope, a granule of activated carbon is full of tiny holes which give the carbon a large and "active" surface area. The greater the area, the more it can absorb. A teaspoonful of a typical activated carbon has enough surface area to cover a football field (1000 m2/g). The research measurement technique of the surface area of these tiny holes, is known as the BET (Brunauer, Emmett and Teller theory, 1938) method. The measurement of the area is determined by the amount of liquid nitrogen required to cover the surface in these holes. The BET method is used in activated carbon research and is not a practical method to be used for routine quality control. The Iodine number or the Butane number, both of which measure the adsorption capacity, are ordinarily used to monitor quality during production.

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