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Feasibility Study of Different Biochars as Adsorbent for Cadmium and Lead

  • Kim, In Ja (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Kim, Rog-Young (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Kim, Ji In (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Kim, Hyoung Seop (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Noh, Hoe-Jung (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Kim, Tae Seung (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Yoon, Jeong-Ki (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Park, Gyoung-Hun (Soil and Groundwater Research Division, National Institute of Environmental Research) ;
  • Ok, Yong Sik (Department of Biological Environment, Kangwon National University) ;
  • Jung, Hyun-Sung (Indoor Environment and Noise Research Division, National Institute of Environmental Research)
  • Received : 2014.11.26
  • Accepted : 2015.10.05
  • Published : 2015.10.31

Abstract

The objective of this study was to evaluate the effectiveness of different biochars on the removal of heavy metals from aqueous media. The experiment was carried out in aqueous solutions containing $200mg\;CdL^{-1}$ or $200mg\;PbL^{-1}$ using two different biochars derived from soybean stover and orange peel (20 mg Cd or $Pbg^{-1}$ biochar). After shaking for 24 hours, biochars were filtered out, and Cd and Pb in the filtrate were analyzed by flame atomic absorption spectrophotometer (FAAS). In order to provide information regarding metal binding strength on biochars, sequential extraction was performed by modified SM&T (formerly BCR). The results showed that 70~100% of initially added Cd and Pb was adsorbed on biochars and removed from aqueous solution. The removal rate of Pb (95%, 100%) was higher than that of Cd (70%, 91%). In the case of Cd, orange peel derived biochar (91%) showed higher adsorption rate than soybean stover derived biochar (70%). Cd was adsorbed on the biochar mainly in exchangeable and carbonates fraction (1st phase). In contrast, Pb was adsorbed on it mainly in the form of Fe-Mn oxides and residual fraction (2nd and 4th phase). The existence of Cd and Pb as a form of surface-precipitated complex was also observed on the surfaces of biochars detected by field emission scanning electron microscope (FESEM) and energy dispersive X-ray spectrometer (EDAX).

Keywords

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