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The objective of this research is to investigate an alternative approach to producing activated carbon from corncob through single-stage physical-chemical activation using phosphoric acid and carbon dioxide as assistive agents. The combined pyrolysis and activation process was studied by varying temperatures between 600 and 800 oC and time between 2- and 4-hour activation periods. The results confirm expectations in terms of product yield and physical properties with optimal condition of 0.1 molar acid concentration at 800 oC temperature and 2 hours retention period. The produced substance yields BET surface area of 825 m2/g with an iodine number of 546.76 mg/g which is well in the range of commercial grade activated carbon available in Thailand.
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