State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Chromatogr A. 2011 Jan 14;1218(2):197-204. doi: 10.1016/j.chroma.2010.11.022. Epub 2010 Nov 19.
Graphene, a novel class of carbon nanostructures, possesses an ultrahigh specific surface area, and thus has great potentials for the use as sorbent materials. We herein demonstrate the use of graphene as a novel adsorbent for solid-phase extraction (SPE). Eight chlorophenols (CPs) as model analytes were extracted on a graphene-packed SPE cartridge, and then eluted with alkaline methanol. The concentrations in the eluate were determined by HPLC with multi-wavelength UV detection. Under the optimized conditions, high sensitivity (detection limits 0.1-0.4 ng/mL) and good reproducibility of CPs (RSDs 2.2-7.7% for run-to-run assays) were achieved. Comparative studies showed that graphene was superior to other adsorbents including C18 silica, graphitic carbon, single- and multi-walled carbon nanotubes for the extraction of CPs. Some other advantages of graphene as SPE adsorbent, such as good compatibility with various organic solvents, good reusability and no impact of sorbent drying, have also been demonstrated. The proposed method was successfully applied to the analysis of tap and river water samples with recoveries ranging from 77.2 to 116.6%. This work not only proposes a useful method for environmental water sample pretreatment, but also reveals great potentials of graphene as an excellent sorbent material in analytical processes.
石墨烯是一种新型的碳纳米结构，具有超高的比表面积，因此在用作吸附材料方面具有巨大的潜力。本文将石墨烯用作新型固相萃取（SPE）吸附剂。以 8 种氯酚（CPs）为模型分析物，在石墨烯填充的 SPE 小柱上进行萃取，然后用碱性甲醇洗脱。洗脱液中的浓度用 HPLC 进行多波长紫外检测。在优化条件下，CPs 的高灵敏度（检测限为 0.1-0.4ng/mL）和良好重现性（运行间测定的 RSD 为 2.2-7.7%）得以实现。对比研究表明，石墨烯在萃取 CPs 方面优于其他吸附剂，包括 C18 硅胶、石墨碳、单壁和多壁碳纳米管。石墨烯作为 SPE 吸附剂的一些其他优点，如与各种有机溶剂的良好兼容性、良好的可重复使用性以及对吸附剂干燥的无影响，也得到了证明。该方法成功地应用于自来水中和河水中 CP 的分析，回收率在 77.2%至 116.6%之间。这项工作不仅提出了一种用于环境水样预处理的有用方法，还揭示了石墨烯作为分析过程中一种优异的吸附材料的巨大潜力。
