Investigating the adsorption behavior and the relative distribution of Cd2+ sorption mechanisms on biochars by different feedstock
2018
Wang, Rong-Zhong | Huang, Dan-Lian | Liu, Yun-Guo | Zhang, Chen | Lai, Cui | Zeng, Guang-Ming | Cheng, Min | Gong, Xiao-Min | Wan, Jia | Luo, Hao
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 °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+-π 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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