期刊
BIORESOURCE TECHNOLOGY
卷 261, 期 -, 页码 265-271出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.04.032
关键词
Biochar; Cadmium; Adsorption mechanism; Feedstock; Heavy metal
资金
- Program for the National Natural Science Foundation of China [51579098, 51408206, 51779090, 51521006, 51278176, 51378190]
- National Program for Support of Top-Notch Young Professionals of China
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan Provincial Science and Technology Plan Project [2016RS3026, 2017SK2243]
- Fundamental Research Funds for the Central Universities [531107051080, 531107050978]
The objective of this study was to investigate the adsorption behavior and the relative distribution of Cd2+ sorption mechanisms on biochars by different feedstock. Bamboo biochars (BBCs), corn straw biochars (CBCs) and pig manure biochars (PBCs) were prepared at 300-700 degrees C. Adsorption results showed PBCs have the best adsorption capacity for Cd2+, the extra adsorption capacity of PBCs mainly attributed to the precipitation or cation exchange, which played an important role in the removal of Cd2+ by PBCs. The contribution of involved Cd2+ removal mechanism varied with feedstock due to the different components and oxygen-containing functional groups. Cd2+-pi interaction was the predominant mechanism for Cd2+ removal on biochars and the contribution proportion significantly decreased from 82.17% to 61.83% as the ash content increased from 9.40% to 58.08%. Results from this study may suggest that the application of PBC is a feasible strategy for removing metal contaminants from aqueous solutions.
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