Abstract
The effects of parameters on the adsorption capacity of activated carbons (AC) prepared from Chinese Herbal Medicines Wastes (CHMWs) by phosphoric acid and CO2 activation were studied. Response surface methodology (RSM) was used to optimize the process parameters for preparing activated carbon from CHMWs. The results showed that the optimal conditions were as follows: impregnation ratio of 2.61, activation temperature of 700 °C, activation time of 2.5 h and the CO2 flow rate was 50mL/min. The adsorption value of iodine and methylene blue of the resultant activated carbon was 626.83 mg/g, 278.99 mg/g, respectively. The Activated Carbon prepared from Chinese Herbal Medicines Wastes (CHMWs) shows high adsorption capacity and well-developed pore structure.
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