Adsorption of phenanthrene, 2-naphthol, and 1-naphthylamine to colloidal oxidized multiwalled carbon nanotubes: Effects of humic acid and surfactant modification
Adsorption of phenanthrene, 2-naphthol, and 1-naphthylamine to colloidal oxidized multiwalled carbon nanotubes: Effects of humic acid and surfactant modification
复制标题
菲、2-萘酚和1-萘胺对胶体氧化多壁碳纳米管的吸附：腐殖酸和表面活性剂改性的影响
DOI：
10.1002/etc.2088
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发表时间：
2013-03-01
影响因子：
4.1
通讯作者：
Chen, Wei
中科院分区：
文献类型：
--
作者：
Hou, Lei;Zhu, Dongqiang;Chen, Wei
碳纳米管（CNTs）可在水生环境中以胶体悬浮液的形式存在，特别是在天然有机物或表面活性剂存在的情况下，并可能显著影响有机污染物的命运和运输。在本研究中，作者检测了菲、2-萘酚和1-萘胺在三种胶体碳纳米管上的吸附，包括氧化多壁碳纳米管（O-MWNT）的稳定悬浮液、腐殖酸（HA）修饰的胶体O-MWNT和十二烷基硫酸钠（SDS）修饰的胶体O-MWNT。所有三种胶体O-MWNTs对三种测试化合物都表现出很强的吸附亲和性（koc值比天然有机物大几个数量级），这可能是由于强的非疏水相互作用，如电子供体-受体相互作用和路易斯酸碱相互作用。当完全混合时，HA（约310mg HA/g CNT）和SDS（约750mg SDS/g CNT）显著影响O-MWNT的聚集特性，导致分散的单个管形成松散纠缠的网络。透明质酸或SDS改性对吸附的影响是双重的。HA/SDS的吸附显著降低了O-MWNT的表面积；然而，纠缠的网络允许吸附分子同时与多个管相互作用。一个重要的启示是，腐殖质和表面活性剂样材料不仅促进胶体碳纳米颗粒的形成，而且影响这些胶体碳纳米颗粒吸附有机污染物的方式。环绕。Toxicol。化学2013;32:493500。(c) 2012 SETAC
Carbon nanotubes (CNTs) can exist in the form of colloidal suspension in aquatic environments, particularly in the presence of natural organic matter or surfactants, and may significantly affect the fate and transport of organic contaminants. In the present study, the authors examined the adsorption of phenanthrene, 2-naphthol, and 1-naphthylamine to three colloidal CNTs, including a stable suspension of oxidized multiwalled carbon nanotubes (O-MWNT), a humic acid (HA)-modified colloidal O-MWNT, and a sodium dodecyl sulfate (SDS)-modified colloidal O-MWNT. All three colloidal O-MWNTs exhibit strong adsorption affinities to the three test compounds (withKOC values orders of magnitude greater than those of natural organic matter), likely resulting from strong nonhydrophobic interactions such as electron donoracceptor interactions and Lewis acidbase interactions. When thoroughly mixed, HA (at approximate to 310mg HA/g CNT) and SDS (at approximate to 750mg SDS/g CNT) significantly affected the aggregation properties of O-MWNT, causing individually dispersed tubes to form a loosely entangled network. The effects of HA or SDS modification on adsorption are twofold. Adsorption of HA/SDS significantly reduces surface areas of O-MWNT; however, the entangled network allows adsorbate molecules to interact simultaneously with multiple tubes. An important implication is that humic substances and surfactant-like materials not only facilitate the formation of colloidal carbon nanoparticles but also affect how these colloidal carbon nanoparticles adsorb organic contaminants. Environ. Toxicol. Chem. 2013;32:493500. (c) 2012 SETAC