期刊
BIORESOURCE TECHNOLOGY
卷 270, 期 -, 页码 545-553出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.09.078
关键词
Biochar and activated carbon; Adsorption mechanisms; Qualitative and quantitative characterization; Heavy metal; Ball mill
资金
- National Natural Science Foundation of China [31271611]
- Innovation Team Project of Education Ministry [IRT_17R105]
This study investigated the key physicochemical characteristics of char that control its ability to absorb Pb2+. Three type of crop residue-derived chars and their ball milled powder were characterized using multiple approaches. The Pb2+ sorption mechanisms of biochar were caused mainly by coprecipitation reactions, which were governed by ionic minerals on chars instead of mineral crystallization (e.g., SiO2 and Al2O3), while coprecipitation reactions and p electronic interaction were the dominant mechanisms of activated carbon. Pearson analysis showed that adsorption quantity (Q) highly correlated with the cation exchange capacity (CEC) (P < 0.01)/oxygen functional groups (OFGs) (P < 0.05) and Q closely correlated with coprecipitation amount (P < 0.01)/complexation amount (P < 0.01). Linear regression equations of sorption amount and CEC (R-2 > 0.8)/OFGs (R-2 > 0.7) were established. CEC and OFGs of chars are the key factors controlled Pb2+ sorption. These results may promote the development of low-cost, engineered biochar with superior sorption qualities for environmental remediation.
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