왕겨 바이오차의 N2O의 배출을 감소하기 위한 NH4-N의 흡착제로서 가능성을 연구하기 위해 NH4-N 용액을 이용하여 왕겨 바이오차의 흡착 특성을 조사하였다. NH4-N 제거율은 왕겨 바이오차를 많이 첨가할수록 NH4-N 제거율이 증가하는 경향을 보이는 반면에, 바이오차 무게(g) 당 NH4-N 흡착량은 감소하는 경향을 보였다. 왕겨 바이오차를 이용한 흡착실험 결과를 Langmuir 흡착등온식에 적용하여 최대 단분자층 흡착량(q(m)), 흡착 친화도(b), 무차원 상수  를 산출하였다. 그결과 무차원 상수  값이 0-1사이에 있어 Langmuir 흡착등 온식을 잘 표현하였다. 따라서 왕겨를 소재로 제조한 바이오차는 흡착에 용이한 것으로 나타났다. 향후 이를 바탕으로 온실가스를 제어하기 위해 왕겨를 소재로 한 바이오차를 토양에 시용하였을 시 N2O 배출 감소를 위한 NH4-N 흡착 특성에 대한 연구가 필요한 것으로 판단된다.

BACKGROUND: Objective of this study was to investigate adsorption characteristics of NH4-N to biochar produced from rice hull in respective to mitigation of greenhouse gases. METHODS AND RESULTS: NH4-N concentration was analyzed by UV spectrophotometer. For adsorption experiment of NH4-N to biochar, input amount of biochar was varied from 0.4 to 10 g/L with 30 mg/L NH4-N solution. Its adsorption characteristic was investigated with application of Langmuir isotherm. Adsorption amount and removal rates of NH4-N were decreased at 53.9% and increased at 20.2% with 10 g/L compared to 0.4 g/L, respectively. The sorption of NH4-N to biochar produced from rice hull was fitted well by a Langmuir model. The largest adsorption amount of NH4-N (qm) and binding strength constant (b) were calculated as 0.4980 mg/g, and 0.0249 L/mg, respectively. It was observed that dimensionless constant (RL) was 0.58. CONCLUSION: It was indicated that biochar produced from rice hull is favorably absorbed NH4-N, because this value lie within 0