Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Adsorption of Mn on iron minerals and calcium compounds to reduce Mn(II) toxicity

2가 망간의 독성 저감을 위해 철산화물과 칼슘화합물을 이용한 망간 흡착

  • Hyo Kyung, Jee (Department of Agricultural Chemistry, Chungbuk University) ;
  • Jin Hee, Park (Department of Agricultural Chemistry, Chungbuk University)
  • Received : 2022.11.15
  • Accepted : 2022.12.15
  • Published : 2022.12.31
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Abstract

Manganese (Mn) exists in various oxidation states and Mn(II) is the most mobile species of Mn, which is toxic to plants and limits their growth. Therefore, the purpose of this study was to reduce Mn toxicity by immobilizing Mn using various adsorbents including iron oxides and calcium compounds. Ferrihydrite, schwertmannite, goethite were synthesized, which was confirmed by X-ray diffraction. Hematite was purchased and used as Mn adsorbent. Calcium compounds such as CaNO3, CaSO4, and CaCO3 were used to increase pH and oxidize Mn. For Mn adsorption, Mn(II) solution was reacted with four iron oxides, CaNO3, CaSO4, and CaCO3 for 24 hours, filtered, and the remaining Mn concentrations in the solution were analyzed by inductively coupled plasma optical emission spectroscopy. The adsorption rate and adsorption isotherm were calculated. Among iron oxides, the adsorption rate was highest for hematite followed by ferrihyrite, but goethite and schwertmannite did not adsorb Mn. In the case of calcium compounds, the adsorption rate was high in the order of CaCO3>CaNO3>CaSO4. In conclusion, treatment of CaCO3 was the most effective in reducing Mn toxicity by increasing pH.

망간은 다양한 산화수로 존재하며 Mn(II)은 망간 중 가장 이동성이 높은 종으로 식물에 독성을 미치며 성장을 제한한다. 따라서, 본 연구의 목적은 다양한 흡착제를 이용하여 망간을 안정화함으로써 망간의 독성을 저감시키는 것이다. Ferrihydrite, schwertmannite, goethite를 합성하여 XRD로 확인하였고 망간 흡착에 사용하였다. Hematite는 구매하여 망간 흡착제로 사용하였다. CaNO3, CaSO4, CaCO3와 같은 칼슘 화합물은 pH를 높이고 망간을 산화시키기 위해 사용하였다. 망간의 흡착을 위해 다양한 농도의 Mn(II) 용액을 4가지 철산화물, CaNO3, CaSO4, CaCO3와 24시간 반응시킨 후 여과하여 용액에 남아있는 망간 농도를 ICP-OES로 분석하고 망간의 흡착율과 흡착등온식을 계산하였다. 그 결과, 철 산화물 중에서는 hematite에 의한 망간 흡착율이 가장 높았으며 ferrihydrite가 다음으로 흡착율이 높았다. 칼슘 화합물의 경우 CaCO3>CaNO3>CaSO4 순으로 흡착율이 높았다. CaCO3은 hematite보다 높은 흡착율을 보였고 CaCO3를 처리하면 pH를 증가시켜 망간의 독성을 감소하는 데 가장 효과적일 것으로 판단된다.

Keywords

Acknowledgement

이 논문은 2020년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2017R1C1B5075522).

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