Journal
BIORESOURCE TECHNOLOGY
Volume 177, Issue -, Pages 308-317Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.11.077
Keywords
Peanut shell; Chinese medicine material residue; Biochar; Pyrolysis temperature; Lead
Funding
- Ocean Public Welfare Scientific Research Project [201305021]
- National Natural Science Foundation of China [41406085]
- Fundamental Research Funds for the Central Universities [201413010]
- China Postdoctoral Science Foundation [2014M550374]
- Development of Science and Technology Project from Shinan District in Qingdao [2012-5-002-SW]
- USDA NIFA Hatch Program [MAS 00028]
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The objective of this study was to investigate the relationship between Pb2+ adsorption and physicochemical properties of biochars produced at different pyrolytic temperatures. Ten biochars were prepared from peanut shell (PS) and Chinese medicine material residue (MR) at 300-600 degrees C. Adsorption kinetics and isotherms were determined, and the untreated and Pb2+-loaded biochars were analyzed by FTIR, SEM-EDX and XRD. Functional groups complexation, Pb2+-pi interaction and precipitation with minerals jointly contributed to Pb2+ adsorption on these biochars. New mineral precipitates (e.g., Pb-2(SO4)O and Pb-4(CO3)(2)(SO4)(OH)(2)) formed during Pb2+ sorption. For high-temperature biochars (>= 500 degrees C), Pb2+ sorption via complexation reduced, but the contribution of Pb2+-pi interaction was enhanced. Dramatic reduction of Pb2+ sorption on demineralized biochars indicated the dominant role of minerals. These results are useful for screening effective biochars as engineered sorbents to remove or immobilize Pb2+ in polluted water and soil. (C) 2014 Elsevier Ltd. All rights reserved.
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