| 生物炭老化及其对重金属吸附的影响机制 |
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| 引用本文： | 吴文卫,周丹丹.生物炭老化及其对重金属吸附的影响机制[J].农业环境科学学报,2019,38(1):7-13. |
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| 作者姓名： | 吴文卫 周丹丹 |
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| 作者单位： | 昆明理工大学环境科学与工程学院;云南省环境科学研究院 |
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| 基金项目： | 国家自然科学基金青年基金项目（41703121）；昆明理工大学人才启动项目（KKSY201722006）；云南省重点研发计划项目（2018BC004） |
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| 摘 要： | 生物炭具有丰富含氧官能团、多孔结构、阳离子交换量、芳香性结构等使其对重金属具有良好的固持作用,进而在重金属污染土壤修复中具有良好的应用前景。生物炭施入土壤中在与土壤接触过程中受物理、化学和生物作用而发生老化现象,致使生物炭特性发生改变。本文综述了原料来源、热解温度和老化方法对老化生物炭特性的影响,以及老化生物炭对重金属吸附的影响机制。老化作用对生物炭特性的改变主要体现在灰分、表面元素组成、含氧官能团、pH、形貌特征、孔隙结构及比表面积。老化生物炭表面含氧官能团、负电荷和CEC含量增加会促进其对重金属的吸附;而比表面积和pH的降低、酚羟基和芳香醚含量增加以及羧基数量减少则抑制其对重金属的吸附。
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| 关 键 词： | 生物炭 老化 重金属 吸附 |
| 收稿时间： | 2018/3/29 0:00:00 |
Influence of biochar aging on its physicochemical properties and adsorption of heavy metals |
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| WU Wen-wei and ZHOU Dan-dan.Influence of biochar aging on its physicochemical properties and adsorption of heavy metals[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2019,38(1):7-13. |
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| Authors: | WU Wen-wei and ZHOU Dan-dan |
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| Institution: | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;Yunnan Institute of Environmental Science, Kunming 650034, China and Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China |
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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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| Keywords: | biochar aging heavy metal sorption |
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