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Title
Preparation of activated carbon from lignin obtained by straw pulping by KOH and K2CO3 chemical activation
Authors
XIAO-JUAN JIN ZHI-MING YU and YU WU
Received
October 29, 2010
Published
Volume 46 Issue 1-2 January-February
Keywords
lignin, KCO, KOH, activated carbon
Abstract
Activated carbon was prepared through chemical activation of lignin from a straw pulping precursor, using K CO and 2 3 KOH as chemical agents. To optimize the preparation method, the effect of the main process parameters (such as impregnation ratio, activation temperature and activation time) on the performance of the obtained activated carbon (expressed in terms of iodine number and yield of activated carbon) was investigated, and the actions of the activating agents were compared. The activated carbon prepared by KCO , under optimum conditions, permitted to obtain a BET 2 3 surface area of 1104 m2/g, including an external or non-microporous surface of 417 m2/g, an average adsorption pore width of 2.0 nm, the amount of methylene blue, iodine number and the yield of activated carbon being of 10.6 mL/0.l g, 1310 mg/g and 19.8%, respectively. As to the carbon activated by KOH under optimum conditions, its BET surface area was of 917 m2/g, including the external or non-microporous surface of 231 m2/g, the average adsorption pore width of 2.5 nm, while the amounts of methylene blue, iodine number and yield of activated carbon were of 9.6 mL/0.l g, 1180 mg/g and 18.7%, respectively.
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