기상 활성화법에 의한 대나무 활성탄 제조
Production of activated carbon from bamboo by gas activation method
기상활성화법 대나무활성탄 활성탄제조 화학공학;
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Activated carbon was produced from sancheong bamboo by a gas activation method, and the physico-chemical properties for the adsorbents were characterized in the CO_(2) adsorption application. The char used in this study was carbonized at 900℃. Gas activation was conducted with respect to various conditions. (activation temperature 750∼900℃, the flow rate of steam 0.5∼2 g-H_(2)O/g-char·hr, the flow rate of carbon dioxide 5∼30 ml-CO_(2)/g-char·min and activation time 1∼5 hr) The yield, adsorption capacity of Iodine and Methylene blue and pore size distribution of the activated carbons prepared were measured. The adsorption capacity increased with increasing the activation temperature, while the yield decreased. The range of adsorption capacity of Iodine and Methylene Blue were 680.8∼1244.5 mg/g and 15.2∼118.1 ml/g, respectively. Highest quality activated carbon was produced at about 850℃. The adsorption capacity of Iodine increased from 795.2 mg/g to 1426.5 mg/g as the flow rate of steam increased. Similarly, the adsorption capacity of Iodine increased from 918.2 mg/g to 1331.7 mg/g as the flow rate of CO_(2) gas increased. But the introduction of the excess activation gases preferably decreased adsorption capacity range due to the pore shrinkage. The isotherm CO_(2) adsorption experiments using the activated carbon prepared in the condition of 850℃, 2 hr and 1 g-H_(2)O/g-char·hr were conducted. The saturated adsorption amount at 20℃ was 106.4 mg-CO_(2)/g. The results showed Freundlich equation and D-A equation fit better adsorption isotherm than Langmuir equation.
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