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Comparative Evaluation of Methylene Blue and Humic Acids Removal Efficiency Using Rice Husk Derived Biochars and Powdered Activated Carbon

쌀겨 바이오차와 분말 활성탄을 이용한 메틸렌 블루와 휴믹산 제거 효율 비교

  • Lee, Juwon (Department of Environmental Engineering, Kangwon National University) ;
  • Jeong, Eunju (Department of Environmental Engineering, Kangwon National University) ;
  • Lee, Jungmin (Department of Environmental Engineering, Kangwon National University) ;
  • Lee, Yong-Gu (Department of Environmental Engineering, Kangwon National University) ;
  • Chon, Kangmin (Department of Environmental Engineering, Kangwon National University)
  • Received : 2021.10.06
  • Accepted : 2021.11.29
  • Published : 2021.11.30

Abstract

This study evaluated the removal efficiencies of methylene blue (MB) and humic acids (HA) using a rice husk (RH) biochar and powdered activated carbon (PAC). The pseudo-second-order model better presented the adsorption of MB and HA onto a RH biochar than the pseudo-first-order model. Furthermore, better description of the adsorption behavior of MB and HA by the Langmuir isotherm model (R2 of the RH biochar: MB = 0.986 and HA = 0.984; R2 of PAC: MB = 0.997 and HA = 0.989) than the Freundlich isotherm model (R2 of the RH biochar: MB = 0.955 and HA = 0.965; R2 of PAC: MB = 0.982 and HA = 0.973) supports the assumption that monolayer adsorption played key roles in the removal of MB and HA using the RH biochar and PAC. Batch experiments were performed on the effects of dosage, temperature, and pH. For all experiments, PAC showed higher efficiencies than RH biochar and MB adsorption efficiencies were higher than those of HA. Adsorption efficiencies increased with increasing amounts of adsorbents and temperature. As the pH increased, adsorption efficiencies of MB were increased while adsorption efficiencies of HA were decreased.

Keywords

Acknowledgement

본 논문은 2021년도 강원녹색환경지원센터의 지원에 의해 수행된 "폐광산 배수 내 유해 중금속 흡착을 위한 기능성 바이오차 개발"로, 연구비 지원에 감사를 드립니다.

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