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| Influence of biochar aging on its physicochemical properties and adsorption of heavy metals |
| Received:March 29, 2018 |
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| KeyWord:biochar;aging;heavy metal;sorption |
| Author Name | Affiliation | E-mail | | WU Wen-wei | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yunnan Institute of Environmental Science, Kunming 650034, China | | | ZHOU Dan-dan | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | 01yongheng@163.com |
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| Abstract: |
| Biochar has been recognized as an effective amendment in soil heavy metal remediation because of its strong ability to adsorb heavy metals due to its abundant oxygen-containing functional groups, porous structure, cation exchange capacity(CEC), and aromatic structure. Biochars are considered to develop multiple property changes with aging, which may create additional interaction mechanisms for the adsorption of heavy metals. These changes mainly include to chemical(e. g., increased ash, changes to surface elements, increased oxygen groups, decreased pH value) and physical(e. g., morphology, pore structure, and specific surface area changes) properties. The review indicated that aging biochars provided more adsorption sites(such as the oxygen-containing functional groups, negative charge, and CEC of biochar) to promote the adsorption of heavy metals. However, the adsorption of heavy metals was also inhibited due to decreased specific surface area, pH value, and carboxyl groups, or increased phenolic hydroxyl and aromatic groups on biochar. |
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