Characterization of cadmium removal from aqueous solution by biochar produced from a giant Miscanthus at different pyrolytic temperatures
Characterization of cadmium removal from aqueous solution by biochar produced from a giant Miscanthus at different pyrolytic temperatures
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DOI：
10.1016/j.biortech.2013.03.186
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发表时间：
2013-06-01
影响因子：
11.4
通讯作者：
Jung, Jinho
中科院分区：
文献类型：
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作者：
Kim, Woong-Ki;Shim, Taeyong;Jung, Jinho
本研究的目的是研究生物炭从水溶液中去除镉的可行性。生物炭是由芒草在 300、400、500 和 600 摄氏度下缓慢热解产生的。较高的热解温度导致生物炭具有更高的芳香结构和更少的极性官能团。特别是在热解温度≥500℃时，生物炭的pH值和表面积大大增加，这使得Cd吸附容量增加至13.24 mg g(-1)。扩散控制的 Cd 去除可能是由于取决于 pH 值的表面吸附或沉淀反应。使用可视化 MINTEQ 程序进行模拟表明沉淀物是 Cd(OH)(2)。此外，生物炭处理显着消除了Cd对大型溞的急性毒性，导致EC50（50%有效浓度）值从0.16 mg L-1增加到0.76 mg L-1。 (c) 2013 Elsevier Ltd. 保留所有权利。
The objective of this study was to investigate the feasibility of biochar for removing Cd from aqueous solution. Biochars were produced from a Miscanthus sacchariflonis via slow pyrolysis at 300, 400, 500 and 600 degrees C. Higher pyrolytic temperature resulted in biochar with a higher aromatic structure and fewer polar functional groups. In particular, pH and surface area of biochar increased greatly at pyrolytic temperatures >= 500 degrees C, which increased Cd sorption capacity up to 13.24 mg g(-1). The diffuse-controlled Cd removal was likely due to a surface sorption or a precipitation reaction depending on pH. A simulation with the visual MINTEQ program indicated that the precipitate was Cd(OH)(2). In addition, biochar treatment significantly removed the acute toxicity of Cd toward Daphnia magna, resulting in increase of EC50 (50% effective concentration) value from 0.16 to 0.76 mg L-1. (c) 2013 Elsevier Ltd. All rights reserved.