Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Study on of Process Parameters for Adsorption of Reactive Orange 16 Dye by Activated Carbon

활성탄에 의한 Reactive Orange 16 염료 흡착에 대한 공정 파라미터 연구

  • Lee, Jong Jib (Division of Chemical Engneering, Kongju National University)
  • 이종집 (공주대학교 화학공학부)
  • Received : 2020.04.02
  • Accepted : 2020.07.03
  • Published : 2020.07.31
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Abstract

The adsorption of reactive orange 16 (RO 16) dye by activated carbon was investigated using the amount of adsorbent, pH, initial concentration, contact time and temperature as adsorption variables. The investigated process parameters were separation coefficient, rate constant, rate controlling step, activation energy, enthalpy, entropy, and free energy. The adsorption of RO 16 was the highest at pH 3 due to the electrostatic attraction between the cations (H+) on the surface of the activated carbon and the sulfonate ions and hydroxy ions possessed by RO 16. Isotherm data were fitted into Langmuir, Freundlich and Temkin isotherm models by applying the evaluated separation factor of Langmuir (RL=0.459~0.491) and Freundlich (1/n=0.398~0.441). Therefore, the adsorption operation of RO 16 by activated carbon was confirmed as an appropriate removal method. Temkin's adsorption energy indicated that this adsorption process was physical adsorption. The adsorption kinetics studies showed that the adsorption of RO 16 follows the pseudo-second-order kinetic model and that the rate controlling step in the adsorption process was the intraparticle diffusion step. The positive enthalpy change indicated an endothermic process. The negative Gibbs free energy change decreased in the order of -3.16 <-11.60 <-14.01 kJ/mol as the temperature increased. Therefore, it was shown that the spontaneity of the adsorption process of RO 16 increases with increasing temperature.

활성탄에 의한 reactive orange 16 (RO 16) 염료의 흡착은 흡착제의 양, pH, 초기 농도, 접촉시간과 온도를 흡착변수로 사용하여 실험하였으며, 분리계수, 속도상수, 율속단계, 활성화 에너지, 엔탈피, 엔트로피, 자유에너지와 같은 공정 파라미터에 대해 조사하였다. RO 16의 흡착은 활성탄 표면의 양이온 (H+)과 RO 16이 가지고 있는 설포네이트 이온 및 수산 이온사이의 정전기적 인력으로 인해 pH 3에서 흡착율이 가장 높았다. 등온자료는 Langmuir, Freundlich 및 Temkin 등온식을 적용하였다. Freundlich 상수(1/n=0.398~0.441)와 Langmuir 분리계수(RL=0.459~0.491)에 의해 활성탄에 의한 RO 16의 흡착조작은 적절한 제거방법임을 확인하였다. Temkin 식의 흡착에너지 (BT=0.293~0.576 kJ/mol) 값으로부터 이 흡착공정이 물리흡착공정이라는 것을 알았다. 흡착 동력학 실험은 RO 16의 흡착이 유사이차반응속도식에 잘 맞는 것으로 나타났다. 흡착공정의 율속단계는 입자 내 확산 단계인 것이 확인되었다. 양수값의 엔탈피 변화는 물리흡착임을 나타냈다. 음수값의 깁스 자유에너지 변화는 온도가 올라갈수록 -3.16<-11.60<-14.01 kJ/mol 순으로 작아졌다. 따라서 RO 16의 흡착공정의 자발성이 온도가 증가할수록 높아진다는 것을 보여주었다.

Keywords

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