커피찌꺼기 biochar를 활용한 구리의 흡착특성
Adsorption Characteristics of Copper using Biochar Derived from Exhausted Coffee Residue
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초록
본 연구는 커피찌꺼기의 환경친화적인 재활용 방안을 모색하기 위하여 커피찌꺼기 biochar를 제조하고, 제조된biochar를 이용하여 구리에 대한 흡착특성을 평가하였다. 커피찌꺼기 biochar에 대한 구리의 흡착은 반응 2시간 이내에급격하게 일어나는 것을 알 수 있었으며, 2시간 이후부터는천천히 평형상태에 도달하는 것을 알 수 있었다. 등온흡착 실험의 결과 Langmuir 및 Freundlich 등온흡착식 모두에서CB600이 CB300에 비해 높은 흡착능을 보였다. 커피찌꺼기biochar에 대한 구리의 흡착능 예측을 위한 최적모델로는 동적흡착모델의 경우 유사이차속도반응식, 그리고 등온흡착모델의 경우 Langmuir 등온식이 더 적합하였다. 또한SEM-EDS 분석결과 구리 흡착 후 biochar 표면에 구리가매우 높은 농도로 흡착되어 있었으며, 이들의 흡착은 biochar 표면의 양이온 교환과 밀접한 관계가 있을 것으로 판단된다. 이상의 결과를 미루어볼 때, 커피찌꺼기는 biochar 제조를위한 재료로 충분히 활용이 가능하며, 구리 흡착제로 활용이가능할 것으로 판단된다.
Abstract
BACKGROUND: There is very limited knowledge of the effects of biochar derived fromexhausted coffee residue on metal adsorption processes. Furthermore, only limited information is available on the adsorption mechanism of copper. The aimof this studywas to evaluate the absorption behaviors of copper by biochar derived from exhausted coffee residue. METHODS AND RESULTS: Biochars produced by pyrolysis of exhausted coffee residue at 300℃(CB300) and 600℃ (CB600) were characterized and investigated as adsorbents for the removal of copper from aqueous solution. The results indicated that the adsorption equilibrium was achieved around 2 h and the pseudosecond- order kinetic model fit the data better than the pseudo-first-order kinetic model. The maximum Cu adsorption capacities of CB600 by Freundlich and Langmuir isothermswere higher than those of CB300. The adsorption data were well described by a Langmuir isotherm compare to Freundlich isotherm. CONCLUSION:Our results suggest that exhausted coffee residue can be used as feedstock materials to produce high quality biochar, which could be used as adsorbents to removal copper.
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