Activated carbons are prepared from the external wall insulation board residual material by the alkali activation method. The performance of the activated carbon is characterized by the FT-IR spectroscopy, the X-ray diffraction, the BET specific surface area, the pore size distribution and the iodine adsorption value. The external wall insulation board is heated from the room temperature to 800℃ at the rate of 10℃/min under the atmosphere of nitrogen and maintains for 30 min. Then it cools to the ambient temperature to obtain charcoal powder. At the ratio of 4∶1(alkali/carbon), the charcoal powder is impregnated for 8 h with 0.1 g/mL KOH solution and is transferred to the activation furnace after being heated to remove water. The charcoal powder is heated from the room temperature to 800℃ at the rate of 10℃/min under the atmosphere of nitrogen, is activated for 60 min, naturally cools down to the room temperature, is washed with 5% hydrochloric acid and water to neutralize, and then is dried to a state of constant weight at 120℃. In the process, the index parameters of the activated carbon are found to be as follows: The iodine value is 2300.27 mg/g, the specific surface area is 1293.45 m²g, the average pore size is 2.4 nm, which is mainly composed of micro pores and small middle pores.

external wall insulation board residual material  /  alkali activation method  /  iodine value  /  specific surface area  /  pore size distribution