Han Qiang, Liang Qionglin, Zhang Xiaoqiong, Yang Liu, Ding Mingyu
The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
J Chromatogr A. 2016 May 20;1447:39-46. doi: 10.1016/j.chroma.2016.04.032. Epub 2016 Apr 13.
Graphene aerogel (GA), a typical kind of three-dimensional (3D) macroscopic assembly, not only provides inherently excellent properties of graphene sheets (GS), but also exhibits interesting characteristics of the 3D macroporous architecture including large and tunable pore volumes, high specific surface areas and fast mass transport kinetics. Thus, it is rational to expect GA to be an efficient adsorbent for solid-phase extraction (SPE). In this paper, a novel GA monolith based solid-phase extraction method was investigated in the application of environment analysis. The GA monolith based SPE cartridge was fabricated directly in the empty cartridge through template-free "sol-cryo" method. Due to the efficient mass transfer, more adsorption sites as well as effective retention for the analytes, the adsorption property of GA for bisphenol A revealed better performance than that of GS. What's more, GA also outperformed in loading and eluting for target analysis. On the basis of the above advantages, the obtained cartridge was applied for the separation of environmental pollutants from water samples. Taking endocrine disrupting chemicals and polychlorinated biphenyls as the polar and weak polar model analytes, optimizing several parameters influencing the recoveries, limits of detection in the range of 0.01-0.11ngmL(-1) and 0.19-1.53ngL(-1) for the two series of compounds were provided by the established methods. The satisfied sensitivity was accessed and recoveries ranging from 76.3 to 112.5% were obtained for all the analytes when the proposed methods were applied in real water samples analysis. The results revealed the potential of GA as an effective sorbent in sample preparation processes.
石墨烯气凝胶（GA）是一种典型的三维（3D）宏观组装材料，它不仅具有石墨烯片层（GS）固有的优异性能，还展现出三维大孔结构的有趣特性，包括大且可调的孔体积、高比表面积和快速的传质动力学。因此，有理由期望GA成为一种用于固相萃取（SPE）的高效吸附剂。本文研究了一种基于GA整体柱的新型固相萃取方法在环境分析中的应用。基于GA整体柱的SPE小柱通过无模板“溶胶 - 冷冻”法直接在空小柱中制备。由于传质效率高、吸附位点多以及对分析物的有效保留，GA对双酚A的吸附性能比GS表现更好。此外，GA在目标分析的上样和洗脱方面也更胜一筹。基于上述优点，所得小柱用于从水样中分离环境污染物。以内分泌干扰物和多氯联苯作为极性和弱极性模型分析物，通过优化几个影响回收率的参数，所建立的方法对这两类化合物的检测限分别在0.01 - 0.11 ng mL⁻¹和0.19 - 1.53 ng L⁻¹范围内。当将所提出的方法应用于实际水样分析时，获得了满意的灵敏度，所有分析物的回收率在76.3%至112.5%之间。结果表明GA在样品制备过程中作为有效吸附剂的潜力。
