Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Adsorption Characteristics of Methyl Orange on Ginkgo Shell-Based Activated Carbon

은행 껍질 기반 활성탄의 메틸오렌지 흡착 특성

  • Lee, Jeong Moon (Department of Chemical Engineering, Sunchon National University) ;
  • Lee, Eun Ji (Department of Chemical Engineering, Sunchon National University) ;
  • Shim, Wang Geun (Department of Chemical Engineering, Sunchon National University)
  • 이정문 (순천대학교 공과대학 화학공학과) ;
  • 이은지 (순천대학교 공과대학 화학공학과) ;
  • 심왕근 (순천대학교 공과대학 화학공학과)
  • Received : 2022.10.06
  • Accepted : 2022.11.07
  • Published : 2022.12.10
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Abstract

In this study, we investigated the adsorption characteristics of methyl orange (MO), an anionic dye, on ginkgo shell-based activated carbon (AC). For this purpose, ACs (GS-1, GS-2, and GS-4) with different textural properties were prepared using ginkgo shells and potassium hydroxide (KOH), a representative chemical activating agent. The correlation between the textural characteristics of AC prepared and the mixing ratio of KOH was investigated using nitrogen adsorption/desorption isotherms. The MO adsorption equilibrium experiment on the prepared ACs was conducted under different pH (pH 3~11) and temperature (298~318 K) conditions, and the results were investigated by Langmuir, Freundlich, Sips and temperature-dependent Sips equations. The feasibility of the MO adsorption treatment process of the prepared AC was also investigated using the dimensionless Langmuir separation factor. The heterogeneous adsorption properties of MO for the prepared AC examined using the adsorption energy distribution function (AED) were closely related to the system temperature and textural characteristics of AC. The kinetic results of the batch adsorption performed at different temperatures can be satisfactorily explained by the homogeneous surface diffusion model (HSDM), which takes into account the external mass transfer, intraparticle diffusion, and active site adsorption. The relationship between the activation energy value obtained by the Arrhenius plot and the adsorption energy distribution function value was also investigated. In addition, the adsorption process mechanism of MO on the prepared AC was evaluated using Biot number.

이 연구에서는 은행껍질기반 활성탄으로 음이온성 염료인 메틸오렌지(MO)의 흡착 특성을 조사하였다. 이를 위해 은행껍질과 대표적인 화학활성화제인 수산화칼륨(KOH)을 이용하여 서로 다른 기공 특성을 지닌 다공성 활성탄(GS-1, GS-2, GS-4)을 제조하였다. 제조한 활성탄의 구조적 특성값과 KOH 혼합비율과의 상관관계는 질소 흡/탈착등온선으로 조사하였다. 활성탄에 대한 MO 흡착 평형 실험은 서로 다른 pH (pH 3~11) 및 온도(298~318 K) 조건에서 실시하였으며 그 결과를 Langmuir, Freundlich, Sips 및 온도 의존 Sips식으로 살펴보았다. 그리고 Langmuir 무차원 분리계수값으로 제조한 활성탄의 MO 흡착처리공정의 타당성을 조사하였다. 흡착에너지분포함수(AED)로 비교 분석한 활성탄에 대한 MO의 불균일 흡착 특성은 온도와 활성탄의 구조적 특성과 밀접한 관련이 있었다. 서로 다른 온도에서 수행한 회분식 흡착 속도 실험 결과는 외부물질전달, 입자 내 확산 및 활성사이트의 흡착을 고려한 균일표면확산모델(HSDM)로 만족스럽게 설명할 수 있었다. 또한 표면확산계수값을 Arrhenius 플롯으로 나타내어 구한 활성화에너지와 흡착에너지분포 함수값과의 상관관계를 살펴보았다. 그리고 Biot 수를 이용하여 제조한 활성탄에 대한 MO의 흡착 공정 메커니즘을 평가하였다.

Keywords

Acknowledgement

이 논문은 순천대학교 교연비 사업에 의하여 연구되었습니다.

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