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Feasibility Study of Different Biochars as Adsorbent for Cadmium and Lead
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 Title & Authors
Feasibility Study of Different Biochars as Adsorbent for Cadmium and Lead
Kim, In Ja; Kim, Rog-Young; Kim, Ji In; Kim, Hyoung Seop; Noh, Hoe-Jung; Kim, Tae Seung; Yoon, Jeong-Ki; Park, Gyoung-Hun; Ok, Yong Sik; Jung, Hyun-Sung;
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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 or using two different biochars derived from soybean stover and orange peel (20 mg Cd or 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).
Biochar;Heavy metals;Adsorption;Sequential extraction;SEM;
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계량서지학적 분석을 통한 국내 biochar 관련 연구 동향 및 전망,김용성;김찬양;현승훈;

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