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Korean Chemical Engineering Research,
Vol.55, No.6, 771-777, 2017
Vol.55, No.6, 771-777, 2017
Carbon Nano Tubes에 의한 난분해성 염료 Eosin Y의 흡착 특성
Adsorption Characteristics of Non-degradable Eosin Y Dye by Carbon Nano Tubes
Carbon nano tubes (CNTs)를 흡착제로 사용하여 회분식 실험을 통해 염료 Eosin Y의 흡착특성을 조사하였다. 본 연구에 사용된 CNTs는 비표면적이 106.9 m2/g, 기공부피는 1.806 cm3/g, 기공직경은 163.2 A이었다. CNTs를 이용한Eosin Y의 흡착실험은 흡착시간, 초기 pH (2~10), 염료 농도(100, 150 및 200 mg/L), 흡착제의 양(0.05~1.0 g)과 온도(293, 313 및 333 K)를 변수로 사용하여 수행하였다. 흡착은 pH와 온도가 낮을수록 잘 이루어졌으며, Langmuir 모델식에 잘 적용되었다. 또한 흡착반응은 유사 2차 속도식에 잘 적용되었으며, 온도가 증가함에 따라 흡착량이 감소하였다. 입자 내 확산 모델 결과는 흡착 과정에서 막확산과 입자확산이 동시에 일어나는 것을 시사해 주었다. 열역학적 해 석에 의하면 CNTs에 의한 염료 Eosin Y의 흡착은 자발적이고 흡열특성을 보였다.
Adsorption characteristics of Eosin Y dye by carbon nano tubes (CNTs) were examined through batch experiments. CNTs used in the study had specific surface area of 106.9 m2/g, porosity volume of 1.806 cm3/g, and porosity diameter of 163.2 A, respectively. Adsorption experiments were carried out as function of contact time, initial solution pH (2~10), dye concentration (100, 150 and 200 mg/L), adsorbent dose (0.05~1.0 g) and temperature (293, 313 and 333 K). The adsorption was favoured at lower pHs and temperatures. Adsorption data were well described by the Langmuir model. The adsorption process followed the pseudo-second order kinetic model. The adsorption capacity decreased with increase in temperature. The results of the intraparticle diffusion model suggested that film diffusion and particle diffusion were simultaneously occured during the adsorption process. Thermodynamic studies suggested the spontaneous and endothermic nature of adsorption of Eosin Y dye onto CNTs.
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