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Physicochemical and Adsorptive Properties of Black Carbon for Radioactive Cesium under Various Combustion Conditions and Tree Species

연소 조건과 수종을 달리한 블랙카본의 물리화학적 성질 및 세슘의 흡착 특성

  • Jeon, Sodam (Division of Earth and Environmental Sciences, Korea Basic Science Institute) ;
  • Choung, Sungwook (Division of Earth and Environmental Sciences, Korea Basic Science Institute) ;
  • Han, Weon Shik (Department of Earth System Sciences, Yonsei University) ;
  • Jang, Kyoung-Soon (Biomedical Omics Group, Korea Basic Science Institute) ;
  • Shin, Woosik (Division of Earth and Environmental Sciences, Korea Basic Science Institute) ;
  • Hwang, Jeonghwan (Division of Earth and Environmental Sciences, Korea Basic Science Institute)
  • 전소담 (한국기초과학지원연구원 지구환경연구부) ;
  • 정성욱 (한국기초과학지원연구원 지구환경연구부) ;
  • 한원식 (연세대학교 지구시스템과학과) ;
  • 장경순 (한국기초과학지원연구원 생의학오믹스연구팀) ;
  • 신우식 (한국기초과학지원연구원 지구환경연구부) ;
  • 황정환 (한국기초과학지원연구원 지구환경연구부)
  • Received : 2017.05.15
  • Accepted : 2017.10.25
  • Published : 2017.11.30

Abstract

This study was carried out to investigate the physicochemical and adsorptive characteristics of black carbon (BC) materials for cesium in case of severe nuclear accidents. The BC was prepared with a xylem of oak and pine trees incompletely combusted with different ramp rate and final temperature. Carbon (C), hydrogen (H) and oxygen (O) atomic ratios, BET, pore structure, and zeta potential were characterized for the produced BC. A low cesium concentration ($C_w{\approx}10^{-7}M$) was used for sorption batch experiments. The H/C and O/C ratios of BC decreased with the increase of final temperature, which indicates a carbonization of the wood materials regardless of ramp rate and tree species. However, SEM images showed different pore structures depending on tree species such as steric and plate-like for oak-BC and pine-BC, respectively. The greatest sorption distribution coefficients of $K_{d,Cs}{\approx}1,200{\sim}1,800L\;kg^{-1}$ were observed for the oak-BC produced at $400^{\circ}C$, while comparatively low $K_{d,Cs}$ < $100L\;kg^{-1}$ for pine-BC. In addition, the sorption capabilities of BC declined with the increase of combustion temperature up to $600^{\circ}C$, because high temperature destroyed surface functionalities with the rise of ash components in the BC. Therefore, the sorption processes of BC for radioactive cesium are predominantly controlled by final production temperature of BC as well as raw materials (e.g., tree species).

Acknowledgement

Supported by : 한국연구재단, 국가과학기술연구회

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