실내환경 유해가스 제거를 위한 활성탄의 흡착특성
Adsorption Properties of the Activated Carbons for Removing Harmful Gases in Indoor Environments
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Abstract
Activated carbons for removing harmful gases in indoor environments were prepared by impregnating granuled activated carbons from coconut chars into HCl and NaOH solutions. BET surface area of the activated carbons after 4 hours activation at 850oC were 1035 m2/g. And the activated carbons had total pore volume of 0.502 m3/g and average pore size of 19Å. Adsorption capacities of the HCl-impregnated activated carbons were 6.9 g/100 g-AC for (CH3)3N gas of 10 ppm and 3.0 g/100 g-AC for NH3 gas, respectively, which were 3~7 times larger than that of non impregnated activated carbons. Adsorption capacities of the NaOH-impregnated activated carbons showed 33 g/100 g-AC for H2S gas of 10 ppm and 8 g/100 g-AC for CH3SH gas, respectively, and these values were 5~18 times higher than that of non impregnated activated carbons, as well. Impregnated activated carbons rapidly adsorbed harmful gases in the adsorption box of 1m3 volume, which corresponds to living indoor environments. Especially, the concentration of H2S gas decreased from 100 ppm to 1.2 ppm after 60 minutes adsorption, which means adsorption efficiency of 98.8%.
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