Abstract
In an effective utilization of bean-curd refuse we tried to produce activated carbon from bean-curd refuse by chemical activation with ZnCl2. We examined the influence of production conditions such as carbonizaton temperature, holding time and impregnation ratio on the pore structure of activated carbon produced.
The surface area of the activated carbon produced were calculated from the N2 adsorp-tion isotherms data by BET method. The maximum surface area was obtained for the activated carbon produced at a carbonization temperature of 550°C for holding time of 60min. The surface area increased with an increase of impregnation ratio in the range of impregnation ratio up to 0.87 and this resulted from the development of micro-porosity. However at an impregnation ratio beyond 0.87, meso-porosity were developed and therefore the surface area increased a little. We could succeeded to produce the activated carbons with surface area more than 1000m2/g from bean-crud refuse by the chemical activation.
We found that ZnCl2 changed caronization behavior of bean-curd refuse in the temperature range of 200 to 400°C and that the activated carbon with high surface area was produced.
