活性炭
电容去离子
介孔材料
碳化
材料科学
比表面积
化学工程
循环伏安法
银合欢
电极
电化学
吸附
化学
复合材料
有机化学
扫描电子显微镜
催化作用
植物
生物
工程类
物理化学
作者
Chia‐Hung Hou,Nei-Ling Liu,Hsing‐Cheng Hsi
出处
期刊:Chemosphere
[Elsevier]
日期:2015-06-29
卷期号:141: 71-79
被引量:61
标识
DOI:10.1016/j.chemosphere.2015.06.055
摘要
Highly porous activated carbons were resource-recovered from Leucaena leucocephala (Lam.) de Wit. wood through combined chemical and physical activation (i.e., KOH etching followed by CO2 activation). This invasive species, which has severely damaged the ecological economics of Taiwan, was used as the precursor for producing high-quality carbonaceous electrodes for capacitive deionization (CDI). Carbonization and activation conditions strongly influenced the structure of chars and activated carbons. The total surface area and pore volume of activated carbons increased with increasing KOH/char ratio and activation time. Overgasification induced a substantial amount of mesopores in the activated carbons. In addition, the electrochemical properties and CDI electrosorptive performance of the activated carbons were evaluated; cyclic voltammetry and galvanostatic charge/discharge measurements revealed a typical capacitive behavior and electrical double layer formation, confirming ion electrosorption in the porous structure. The activated-carbon electrode, which possessed high surface area and both mesopores and micropores, exhibited improved capacitor characteristics and high electrosorptive performance. Highly porous activated carbons derived from waste L. leucocephala were demonstrated to be suitable CDI electrode materials.
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