The iodine value of activated carbon is 245.5mg/g which is maximum only at 2N concentration indicating good surface area and porosity. When the concentration decreases to 1N, the iodine value is relatively low because of insufficient potassium hydroxide to react with TL to efficiently create the internal pore structures. However, if the concentration of potassium hydroxide is as high as 3N or more, the micro pore structure of TL deteriorated due to excessive activating solutions.