낙엽소재를 활용하여 제조한 흡착제의 H₂S 흡착특성연구

H₂S Adsorption characteristics of adsorbent made by fallen leaves were investgated using a batch type adsorption column. The manufacturing method of adsorbent used in this experiment is to calcinate and treat various fallen leaves with acid solution. For physical property analyses of the manufactured adsorbents, various methods such as scanning electron microscope (SEM), measurement of BET surface area were adopted. As operating variables for adsorption equilibrium test, adsorption temperature(25~45℃), H₂S gas concentration (2.48~31.62 ㎎/l) were applied. As major adsorption characteristics, adsorption rate and adsorption equilibrium capacity were measured. The experimental result showed that the BET surface area of an oak leaves is about 150㎡/g, which is the largest among five fallen leaves. After acid treatment with HCl solution, the BET surface area of fallen leaves are found to be 70~200㎡/g, which indicate 1.5~2.0 times higher values than without acid treatment. It seems that the large increase of BET surface area is due to an enlargement of internal pore volume by dissolution of inorganic constituents in fallen leaves. The surface structure of carbonization material of fallen leaves by SEM analysis showed very different aspect for five fallen leaves adopted in this research. It was also found that H₂S adsorption equilibrium capacity of adsorbent made by fallen leaves decreased with increasing temperature, but increased with increasing H₂S concentration. The H₂S adsorption equilibrium capacity of adsorbent made by fallen leaves were favorable on the whole. Especially, with acid treatment, the adsorbent made by the cherry tree leaves showed excellent adsorption equilibrium capacity (l18㎎ H₂S/g adsorbent), about 90% level of the conventional activated carbon. Through the evaluation of adsorption isotherm model, it was found that H₂S adsorption isotherm for adsorbent made by fallen leaves can be expressed well by Langmuir and Freundlich isotherm equation. It is estimated that the development of practical adsorbent using fallen leaves for odor removal would be possible, if the additional optimization research would proceed, because the supply of raw material is very easy and the dryness level of fallen leaves is very high.