괭생이 모자반 바이오차를 활용한 수용액 내 중금속 흡착 효과
Adsorption Effect of Heavy Metals in Aqueous Solution Using Sargassum Horneri Biochar
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본 연구는 해조류인 괭생이 모자반을 탄화하여 만든 바이오차의 중금속 흡착 및 제거 효과를 확인하고 중금속 흡착제로 이용 가능성을 확인하고자 연구가 수행되었다. 모자반 바이오차(SBC)는 500℃조건에서 2시간 열분해를 통해 생산하였다. 중금속 흡착실험은 Pb, Cd, Cu 및 Zn의 각 농도별 흡착량을 확인하였으며, Freundlich 및 Langmuir 등온흡착모델을 통해 중금속 흡착 효율성을 확인하였다. 모자반 바이오차의 중금속 제거효율은 Pb, Cd, Cu 및 Zn에서 각각 97.3, 85.2, 76.4 및 42.0%로 Pb＞Cd＞Cu＞Zn 순의 제거효율을 보였다. 등온흡착결과로 Freundlich 등온흡착패턴은 L형이었으며, 흡착강도(1/n)는 0.49 ~ 0.80 범위로 조사되었다. Langmuir 등온흡착식에서 최대흡착량은 Pb, Cd, Cu 및 Zn에서 각각 200, 92.6, 47.8 및 70.4 mg g 이었으며, 흡착강도는 각각 0.4950, 0.1004, 0.0245 및 0.0188로 조사되었다. 본 실험 결과로 볼 때 모자반 바이오차는-1중금속 흡착제로써 활용이 가능할 것으로 보여지며, 이를 활용하기 위한 추가 연구가 필요하다고 보여진다.
Abstract
This study was conducted to confirm the adsorption and removal effects of biochar made by carbonizing seaweed (Sargassum horneri) and to determine its potential use as a heavy metal adsorbent. S. horneri biochar (SBC) was pyrolyzed at 500℃ for 2 hours. The adsorption experiment investigated the adsorption amounts of heavy metals Pb, Cd, Cu, and Zn by concentration and determined the efficiency of removing heavy metals through Freundlich and Langmuir isothermal adsorption models. The heavy metal removal efficiency of SBC was 97.3%, 85.2%, 76.4%, and 42.0% for Pb, Cd, Cu, and Zn, respectively, in the order of Pb＞Cd＞Cu＞Zn. The Freundlich isotherm adsorption pattern was L-type, and the adsorption strength (1/n) ranged from 0.49 to 0.80. In the Langmuir adsorption isotherm, the maximum adsorption amounts were 200, 92.6, 47.8, and 70.4 mg g-1 for Pb, Cd, Cu, and Zn, respectively, and the binding strengths were 0.4969, 0.1005, 0.0110, and 0.0131, respectively. Based on the results of this experiment, it seems that SBC can be used as a heavy metal adsorbent; however, additional research is needed to fully utilize it.
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