Carrillo-Carrión Carolina, Lucena Rafael, Cárdenas Soledad, Valcárcel Miguel
Department of Analytical Chemistry, Marie Curie Building (Annex), Campus de Rabanales, University of Cordoba, E-14071 Cordoba, Spain.
Analyst. 2007 Jun;132(6):551-9. doi: 10.1039/b701019b. Epub 2007 Apr 27.
The advantages of surfactant-coated carbon nanotubes (CNTs) as coadjutants in liquid-liquid extraction are systematically considered. The effect of the CNT state (dispersed or suspended in an aqueous medium) is characterized by the single-component solid-liquid isotherms exemplified for benzene. Adsorption isotherms are obtained by means of a headspace-GC-MS method, the recommended instrumental combination when very volatile compounds are involved. Adsorption studies are completed using toluene and n-undecane as model analytes of aromatic and linear hydrocarbons, respectively. The potential of using dispersed carbon nanotubes to improve liquid-liquid extraction is finally evaluated. The liquid-liquid distribution of the two model analytes between an organic phase (n-heptane) and the aqueous dispersion of CNTs is studied via batch extraction and subsequent analysis of the organic phase by GC-MS. A prospective application of this methodology is also given.
系统地考虑了表面活性剂包覆的碳纳米管（CNT）作为液-液萃取中的辅助剂的优势。以苯为例，通过单组分固-液等温线来表征CNT状态（分散或悬浮于水性介质中）的影响。吸附等温线通过顶空-气相色谱-质谱联用（HS-GC-MS）方法获得，当涉及极易挥发的化合物时，这是推荐的仪器组合。分别使用甲苯和正十一烷作为芳香烃和直链烃的模型分析物完成吸附研究。最后评估了使用分散的碳纳米管改善液-液萃取的潜力。通过分批萃取以及随后用气相色谱-质谱联用仪对有机相进行分析，研究了两种模型分析物在有机相（正庚烷）和CNT的水分散体之间的液-液分配情况。还给出了该方法的一个潜在应用。
