Sorption mechanisms of perfluorinated compounds on carbon nanotubes
Sorption mechanisms of perfluorinated compounds on carbon nanotubes
复制标题
全氟化合物在碳纳米管上的吸附机制
DOI：
10.1016/j.envpol.2012.03.048
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发表时间：
2012-09-01
影响因子：
8.9
通讯作者：
Xing, Baoshan
中科院分区：
文献类型：
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作者：
Deng, Shubo;Zhang, Qiaoying;Xing, Baoshan
全氟化合物（PFC）在碳纳米管（CNT）上的吸附对于了解其在水环境中的后续运输和归宿至关重要，但吸附机制在很大程度上仍然未知。在本研究中，6种PFC在碳纳米管上的吸附量随碳氟链长度的增加而增加，且含羟基和羧基的碳纳米管的吸附量远低于未含羟基和羧基的碳纳米管，表明疏水作用主导了PFC在碳纳米管上的吸附。静电斥力抑制了PFCs在碳纳米管上的吸附，导致随着pH值的增加吸附量降低。氢键相互作用可以忽略不计。疏水性的碳氟链可以沿平行于碳纳米管轴向或沿着弯曲方向紧密吸附在碳纳米管表面，使碳纳米管表面无法形成胶束，导致碳纳米管的吸附性能低于其他吸附剂。(c)2012爱思唯尔有限公司保留所有权利。
Sorption of perfluorinated compounds (PFCs) on carbon nanotubes (CNTs) is critical for understanding their subsequent transport and fate in aqueous environments, but the sorption mechanisms remain largely unknown. In this study, the sorption of six PFCs on CNTs increased with increasing C-F chain length when they had a same functional group, and the CNTs with hydroxyl and carboxyl groups had much lower adsorbed amount than the pristine CNTs, indicating that hydrophobic interaction dominated the sorption of PFCs on the CNTs. Electrostatic repulsion suppressed the sorption of PFCs on the CNTs, resulting in the lower sorption with increasing pH. Hydrogen bonding interaction was negligible. The hydrophobic C-F chains can be closely adsorbed on the CNTs surface in parallel to the axis or along the curvature, making it impossible to form micelles on the CNT surface, leading to the lower sorption than other adsorbents. (c) 2012 Elsevier Ltd. All rights reserved.