농업과학연구 (Korean Journal of Agricultural Science)

  • 제48권3호
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  • Pages.589-596
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  • 2021
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  • 2466-2402(pISSN)
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  • 2466-2410(eISSN)
충남대학교 농업과학연구소 (Institute of Agricultural Science, CNU)
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Adsorption characteristics of NH4-N by biochar derived from pine needles

  • Kang, Yun-Gu (Department of Bio-Environmental Chemistry, College of Agriculture and Life Science, Chungnam National University) ;
  • Lee, Jun-Young (Department of Bio-Environmental Chemistry, College of Agriculture and Life Science, Chungnam National University) ;
  • Chun, Jin-Hyuk (Department of Bio-Environmental Chemistry, College of Agriculture and Life Science, Chungnam National University) ;
  • Lee, Jae-Han (Department of Bio-Environmental Chemistry, College of Agriculture and Life Science, Chungnam National University) ;
  • Yun, Yeo-Uk (Chungnam Agricultural Research and Extension Services) ;
  • Oh, Taek-Keun (Department of Bio-Environmental Chemistry, College of Agriculture and Life Science, Chungnam National University)
  • 투고 : 2021.06.18
  • 심사 : 2021.08.18
  • 발행 : 2021.09.01
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초록

Nitrogen applied to soil is highly prone to leaching and volatilization leading to gaseous emissions of nitrous oxide (N2O) and ammonia (NH3) which are of great environmental concern. Usage of biochar to reduce the discharge of nitrogen to the environment has attracted much interest in the recent past. Biochar is produced by pyrolyzing various biomasses under oxygen-limited conditions. Biochar is a carbonized material with high adsorptive powers for not only plant nutrients but also heavy metals. The objective of this study was to investigate the adsorption characteristics of NH4-N onto biochar made from pine needles. The biochar was produced at various pyrolysis temperatures including 300, 400 and 500℃ and holding times of 30 and 120 minutes. The Langmuir isotherm was used to evaluate the adsorption test results. The chemical properties of the biochar varied with the pyrolysis conditions. In particular, the pH, EC and total carbon content increased with the increasing pyrolysis conditions. The rate of adsorption of NH4-N by the biochar decreased with the increasing pyrolysis conditions. Of these conditions, biochar that was pyrolyzed at 300℃ for 30 minutes showed the highest adsorption rate of approximately 0.071 mg·g-1. Thus, the use of biochar pyrolyzed at low temperatures with a short holding time can most efficiently reduce ammonia emissions from agricultural land.

키워드

과제정보

본 논문은 농촌진흥청(Rural Development Administration of Korea)의 연구사업(세부과제번호: PJ01425302)의 지원에 의해 수행되었습니다.

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