Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Equilibrium, Kinetic and Thermodynamic Parameter Studies on Adsorption of Acid Black 1 Using Coconut Shell-Based Granular Activated Carbon

야자각계 입상 활성탄의 Acid Black 1 염료 흡착에 대한 평형, 동역학 및 열역학 파라미터의 연구

  • Lee, Dong-Chang (Division of Chemical Engineering, Kongju National University) ;
  • Lee, Jong-Jib (Division of Chemical Engineering, Kongju National University)
  • 이동창 (공주대학교 화학공학부) ;
  • 이종집 (공주대학교 화학공학부)
  • Received : 2016.09.01
  • Accepted : 2016.10.03
  • Published : 2016.12.10
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Abstract

In this study, the adsorption behavior from aqueous solution as well as kinetic and thermodynamic parameters of Acid Black 1 were investigated through batch reaction using coconut shell based granular steam activated carbon. The effects of various adsorption parameters such as pH, initial concentration, contact time, temperature were studied. To confirm the effect of pH, pHpzc measurements were analyzed followed by measuring removal efficiencies of Acid Black 1 at the pH range from 3 to 11. Experimental equilibrium adsorption data were fitted using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich adsorption isotherm. The conformity of adsorption reaction for pseudo first and second order model were evaluated through kinetic analysis. Values of enthalpy change and activation energy were also investigated through thermodynamic analysis and it was confirmed that the adsorption process was endothermic. The spontaneity of adsorption process was evaluated using the values of entropy and Gibbs free energy changes.

본 연구는 흡착제로 야자각계 수증기 활성화 입상 활성탄을 사용하여 Acid Black 1 수용액에서의 흡착 거동과 동역학적, 열역학적 파라미터에 대해 회분식 반응을 통해 조사하였다. 흡착변수로는 pH, 초기농도, 접촉시간, 온도를 사용하였다. pH에 대한 영향을 조사하기 위해 pHpzc 값을 분석한 뒤 pH 3-11 범위에서 제거율을 조사하였다. 흡착평형자료로부터 Langmuir, Freundlich, Temkin, Dubinin-Radushkevich 등온 흡착식에 대한 적합성을 평가하였다. 흡착공정에 대한 동역학적 해석을 통해 유사 1차반응식과 유사 2차반응식에 대한 흡착반응의 일치도를 평가하였다. 열역학적 해석을 통해 엔탈피 변화 값과 활성화에너지 값을 조사하여 이를 통해 흡착공정이 흡열반응인지를 확인하였으며, 엔트로피 변화 값과 자유에너지 값을 통해 흡착공정의 자발성을 확인하였다.

Keywords

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