Abstract：
Experimental and theoretical assessments of a graphene oxide-based polymer as adsorbent for thin film microextraction (TFME) were conducted as part of this research. Graphene oxide (GO) was embedded in the organic polymer poly(styrene-co-divinylbenzene) (PS-DVB) to prepare a sorbent suitable for direct-immersion TFME. A TFME membrane coating prepared with the GO/PS-DVB sorbent and polydimethylsiloxane (PDMS) as binder was then applied for extraction of organic pollutants from aqueous and gaseous samples. The surface morphology of the TFME coating was examined by scanning electron microscopy (SEM). Various TFME parameters influencing extraction efficiency, such as extraction time and temperature, desorption temperature, and ionic strength, were investigated and optimized. In a comparison of TFME membranes, the GO/PS-DVB/PDMS TFME membrane was shown to yield higher extraction efficiencies for the targeted analytes than the pure PDMS and DVB/PDMS TFME membranes. The calibration graphs of the organic pollutants displayed linearity for most of the target analytes within the 10-2000 ng L-1 concentration range. The repeatability (RSD %, n = 5) and reproducibility (RSD %, n = 3) of the method were in the ranges of 2.2-5.9 %, and 3.2-8.5 %, respectively, at a concentration level of 500 ng L-1, whereas accuracy (%) ranged between 79.8 and 119 %. The developed method was successfully applied for determinations of organic pollutants in tap water, lake water, and wastewater samples. Furthermore, the impact of mass transfer kinetics on extractions by the GO/PS-DVB/PDMS TFME membrane from gaseous samples was theoretically discussed and experimentally verified. The results of this work demonstrate that the GO/PS-DVB/PDMS TFME method is a simple, efficient, and environmentally friendly method for pre-treatment of organic pollutants.
摘要：
作为本研究的一部分，对作为薄膜微萃取（TFME）吸附剂的基于氧化石墨烯的聚合物进行了实验和理论评估。将氧化石墨烯（GO）嵌入有机聚合物聚（苯乙烯-共-二乙烯基苯）（PS-DVB）中，以制备适用于直接浸入TFME的吸附剂。然后将用GO/PS-DVB吸附剂和聚二甲基硅氧烷（PDMS）作为粘合剂制备的TFME膜涂层用于从水性和气态样品中提取有机污染物。通过扫描电子显微镜(SEM)检查TFME涂层的表面形态。影响提取效率的各种TFME参数，如提取时间和温度，解吸温度,和离子强度，进行了调查和优化。在TFME膜的比较中，与纯PDMS和DVB/PDMSTFME膜相比,GO/PS-DVB/PDMSTFME膜对目标分析物的提取效率更高。有机污染物的校准图显示了大多数目标分析物在10-2000ngL-1浓度范围内的线性。重复性(RSD%，n=5)和再现性(RSD%，方法的n=3）在2.2-5.9％的范围内，和3.2-8.5%，分别,浓度水平为500ngL-1，而准确性（％）介于79.8％和119％之间。该方法已成功应用于自来水中有机污染物的测定。湖水,和废水样本。此外，从理论上讨论和实验上验证了传质动力学对GO/PS-DVB/PDMSTFME膜从气态样品中萃取的影响。这项工作的结果表明，GO/PS-DVB/PDMSTFME方法是一种简单的，高效,和环境友好的有机污染物预处理方法。
