Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Cesium Adsorption Properties of Activated Carbon with Oxygen Functional Groups Introduced by Ozonation Treatment

오존 처리에 의해 산소 작용기가 도입된 활성탄소의 세슘 흡착 특성

  • Eunseon Chae (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Chung Gi Min (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Chaehun Lim (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Young-Seak Lee (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 채은선 (충남대학교 응용화학공학과) ;
  • 민충기 (충남대학교 응용화학공학과) ;
  • 임채훈 (충남대학교 응용화학공학과) ;
  • 이영석 (충남대학교 응용화학공학과)
  • Received : 2023.12.01
  • Accepted : 2024.01.03
  • Published : 2024.02.10
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Abstract

Cesium is a potential toxic contaminant due to its high solubility, which allows it to easily penetrate the human body and potentially induce cancer or DNA mutations. In this study, oxygen functional groups were introduced on activated carbons (ACs) by ozone treatment to enhance the cesium adsorption capacity. As the ozone treatment time increased, the oxygen content on the ACs surface increased. Subsequently, the electrostatic interaction between ACs and cesium enhanced, resulting in higher cesium ion adsorption efficiency across all samples. In particular, the sample treated with ozone for 7 minutes at an internal ozone concentration of 50000 ppm had roughly 12% greater oxygen functional group content and the highest cesium removal effectiveness (97.6%). Meanwhile, samples treated for 5 minutes showed a 0.3% cesium removal rate difference compared to those treated for 7 minutes, which was caused by the surface chemical similarity of the two samples due to the reactive characteristics of ozone gas. However, the cesium adsorption performance of ozonated activated carbon seems to be mainly influenced by the amount of oxygen functional groups introduced to the surface, although the specific surface area and pore structure of the activated carbon are also important.

세슘은 높은 수용성으로 인하여 인체에 쉽게 침투하여 암 또는 DNA의 변형을 유발하는 잠재적인 독성 오염물질이다. 본 연구에서는 활성탄소의 세슘 흡착 능력을 향상시키고자 오존 처리를 통하여 활성탄소 표면에 산소 작용기를 도입하였다. 오존 처리 시간의 증가에 따라 활성탄소 표면의 산소함량이 증가하였다. 이후 활성탄소와 세슘 사이의 정전기적 상호작용이 더욱 원활하게 이루어져 모든 시료의 세슘 이온 흡착 효율이 향상되었다. 특히 반응기 내부 오존 농도를 50000 ppm으로 하여 7 min 동안 오존 처리한 시료는 약 12%의 높은 산소 작용기 함량을 보이며 97.6%의 가장 높은 세슘 제거 효율을 보였다. 한편, 5 min 동안 처리된 시료는 7 min간 반응한 시료와 비교하여 0.3%의 근소한 세슘 제거율 차이를 보였으며, 이는 오존 기체의 반응 특성으로 인한 두 시료의 표면화학적 유사성에 기인한다. 그러나, 오존 처리된 활성탄소의 세슘 흡착 성능은 활성탄소의 비표면적 및 기공 구조도 중요하지만 표면에 도입된 산소 작용기 양이 주된 영향을 미치는 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 한국산업기술평가관리원의 전략핵심소재자립화기술개발사업(산업폐수 처리용 석유계 잔사유 기반 다공성 흡착소재 개발: 20012763)의 지원에 의하여 수행하였으며 이에 감사드립니다.

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