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首页> 外文期刊>Environmental Science & Technology >Caged Multiwalled Carbon Nanotubes as the Adsorbents for Affinity-Based Elimination of Ionic Dyes
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Caged Multiwalled Carbon Nanotubes as the Adsorbents for Affinity-Based Elimination of Ionic Dyes

机译：笼式多壁碳纳米管作为基于亲和力消除离子染料的吸附剂

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摘要

Multiwalled carbon nanotubes (MWCNTs) were used as the active elements for the first time for affinity-based elimination of ionic dyes. MWCNTs were encapsulated in cross-linked alginate (ALG) microvesicles using Ba{sup}(2+) as the bridging ion. The Ba{sup}(2+)-alginate matrix constitutes a cage which holds the physically trapped MWCNTs. The cage carries negative charges on its surface. The cage restricts the access of anions of large molecular weight, such as humic acids, because of electrostatic repulsion. The cage also restricts the access of colloids of large size, because of size exclusion. Ionic dyes partition into the cage and then are captured by MWCNTs probably on the basis of van der Waals interactions occurring between the hexagonally arrayed carbon atoms in the graphite sheet of MWCNTs and the aromatic backbones of the dyes. As a result of these interactions the target species, namely, the ionic dyes, are eliminated efficiently by the MWCNTs of Ba{sup}(2+)-ALG/MWCNT composite adsorbents. The adsorptive capacities for elimination of acridine orange, ethidium bromide, eosin bluish, and orange G (the model species used for this study) were found as high as 0.44, 0.43, 0.33, and 0.31 μmol, respectively, for 1.0 mg of the caged MWCNTs. Adsorptive experiments with carbon nanofibers and activated carbons as the adsorbents were also performed. The MWCNT-based adsorbents provided the best capability for the affinity-based elimination of these targeted species. Biocompatibility experiments performed in vitro and in vivo provided promising results, suggesting potential applications of the caged MWCNTs in in situ environmental remediation.
机译：多壁碳纳米管（MWCNT）首次用作基于亲和力的离子染料消除的活性元素。使用Ba {sup}（2+）作为桥联离子，将MWCNTs封装在交联的藻酸盐（ALG）微泡中。 Ba {sup}（2 +）-藻酸盐基质构成一个笼子，该笼子容纳着被物理捕获的MWCNT。笼子的表面带有负电荷。由于静电排斥，笼子限制了大分子量阴离子（如腐殖酸）的进入。由于尺寸排阻，笼子也限制了大尺寸胶体的进入。离子染料分配到笼子中，然后可能是基于MWCNT石墨薄片中排列成六边形的碳原子与染料的芳族骨架之间发生的范德华相互作用而被MWCNT捕获的。这些相互作用的结果是，Ba {sup}（2 +）-ALG / MWCNT复合吸附剂的多壁碳纳米管有效地消除了目标物质，即离子染料。发现对于1.0 mg笼养的elimination啶橙，溴化乙锭，曙红蓝和橙G（本研究使用的模型物种），其吸附能力分别高达0.44、0.43、0.33和0.31μmol。多壁碳纳米管。还进行了以碳纳米纤维和活性炭为吸附剂的吸附实验。基于MWCNT的吸附剂提供了基于亲和力消除这些目标物种的最佳能力。在体外和体内进行的生物相容性实验提供了令人鼓舞的结果，表明笼中的MWCNT在原位环境修复中的潜在应用。

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