lodine Adsorption of Activated Carbon

lodine adsorption of activated carbon: It is a simple test that gives an indication of the internal surface area of the activated carbon. In many carbons, the iodine number (expressed as milligrams of iodine per gram of carbon) is close to the Brunauer-Emmett- Teller (BET) surface area. In this method, the activated carbon is boiled with 5% HCI and, after cooling, a 0.1 N iodine solution is added and shaken for 30 seconds. The filtrate is titrated with 0.1N sodium thiosulfate solution after filtration, with starch as an indicator.