Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Evaluation of Cd Adsorption Characteristic by Microplastic Polypropylene in Aqueous Solution

수중에서 미세플라스틱인 Polypropylene의 Cd 흡착특성 평가

  • Eom, Ju-Hyun (Department of Agricultural Chemistry and Food Science & Technology, Gyeongsang National University) ;
  • Park, Jong-Hwan (Divison of Applied Life Science (BK21 plus) & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Kim, Seong-Heon (Soil and Fertilizer division, National Institute of Agricultural Sciences) ;
  • Kim, Yeong-Jin (Environmental Toxicology Research Center, Korea Institute of Toxicology) ;
  • Ryu, Sung-Ki (Department of Agricultural Chemistry, Gyeongsang National University) ;
  • Seo, Dong-Cheol (Department of Agricultural Chemistry and Food Science & Technology, Gyeongsang National University)
  • 엄주현 (경상대학교 농화학식품공학과) ;
  • 박종환 (경상대학교 응용생명과학부(Bk21 농생명산업 글로벌 인재 육성 사업단) & 농업생명과학원) ;
  • 김성헌 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 김영진 (안전성평가연구소 환경독성연구센터) ;
  • 류성기 (경상대학교 농화학과) ;
  • 서동철 (경상대학교 농화학식품공학과)
  • Received : 2019.06.19
  • Accepted : 2019.06.26
  • Published : 2019.06.30
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Abstract

BACKGROUND: In recent years, studies on microplastics have focused on their decomposition in the ocean. However, no studies have been reported on the interaction between microplastics and metal ions in aqueous solutions. Therefore, this study was conducted to evaluate the adsorption capacity of cadmium(Cd) by polypropylene (PP) in aqueous solution. METHODS AND RESULTS: Cadmium adsorption characteristics of PP in aqueous solution were evaluated through various conditions including initial Cd concentration(1.25-25 mg/L), contact time(0.5-24 h), initial pH(2-6) and temperature($20-50^{\circ}C$). Cadmium adsorption fit on PP was well described by Freundlich isotherm model with adsorption capacity(K) of 0.028. The adsorption amount of Cd by PP increased with increasing contact time, indicating that adsorption of PP by Cd was dominantly influenced by contact time. Especially, the removal efficiency of Cd by PP was highest at high temperature. However, the surface functional groups of PP before and after adsorption of Cd were similar, suggesting that adsorption of Cd by PP is not related to surface functional groups. CONCLUSION: Our study suggests that PP affects the behavior of Cd in aqueous solution. However, in order to clarify the specific relationship between microplastics and metal ions, mechanism research should be carried out.

본 연구는 미세플라스틱 주요물질 중의 하나인 PP와 담수상태에서 중금속 사이의 상관관계를 평가하기 위해 등온흡착모델과 다양한 흡착조건하에서 microplastic인 PP에 의한 Cd의 흡착특성을 평가하였다. Microplastic인 PP에 의한 Cd의 흡착경향은 Freundlich 흡착식에 적합하였으며, 주요한 흡착메카니즘은 물리적인 흡착으로 판단된다. 특히, PP에 의한 Cd의 흡착량은 반응시간과 반응온도에 지배적인 영향을 받았으며, 반응시간과 반응온도가 증가할수록 흡착량은 증가하였다. 초기 pH에 따른 흡착결과 PP에 의한 Cd의 흡착은 표면전하와 큰 상관관계가 없었고, FTIR분석을 통한 Cd 흡착 전과 후의 PP작용기에 별 다른 차이가 없어 PP에 의한 Cd의 흡착은 대부분 물리적 흡착으로 판단되었다. 결론적으로 담수상태에서 미세플라스틱인 PP는 Cd과 같은 중금속을 흡착한 후 생물체내로 이동시킬 수 있는 가능성을 확인할 수 있었고, 향후 미세플라스틱에 의한 중금속과 같은 독성물질이동과 전이매개체의 역할과 메커니즘을 규명하기 위한 체계적인 후속연구가 수행되어야 할 것으로 판단된다.

Keywords

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