Center of Excellence for Innovation in Chemistry, Division of Physical Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
Department of Analytical Chemistry, Faculty of Chemistry and BioTechMed Center, Gdańsk University of Technology, Gdańsk, Poland.
J Sep Sci. 2022 May;45(10):1774-1783. doi: 10.1002/jssc.202200041. Epub 2022 Mar 31.
A hierarchical porouscomposite magnetic sorbent was fabricated and applied to the dispersive solvent-assisted solid-phase extraction of five polycyclic aromatic hydrocarbons. A sorbent was first prepared by incorporating graphene oxide, calcium carbonate, and magnetite nanoparticles into a polyvinyl alcohol cryogel. The graphene oxide was converted to reduced graphene oxide using ascorbic acid and a hierarchical porous structure was produced by reacting hydrochloric acid with incorporated calcium carbonate to generate carbon dioxide bubbles which created a second network. Before extracting the target analytes, the extraction solvent was introduced into the hierarchical pore network of the sorbent. The extraction was based on the partition between the analytes and introduced extraction solvent and the adsorption of analytes on reduced graphene oxide.The extraction efficiency was enhanced through π-π and hydrophobic interactions between polycyclic aromatic hydrocarbons and reduced graphene oxide and extraction solvent. The extracted polycyclic aromatic hydrocarbons were determined by using high-performance liquid chromatography coupled with a fluorescence detector. The developed method was applied to extract polycyclic aromatic hydrocarbons in disposable diaper, coffee, and tea samples and recoveries from 84.5 to 99.4% were achieved with relative standard deviations below 7%. The developed sorbent exhibited good reproducibility and could be reused for 10 cycles.The developed sorbent exhibited good reproducibility and could be reused for 10 cycles.The developed sorbent exhibited good reproducibility and could be reused for 10 cycles.
一种分级多孔复合磁性吸附剂被制备并应用于分散溶剂辅助固相萃取五种多环芳烃。首先通过将氧化石墨烯、碳酸钙和磁铁矿纳米粒子掺入到聚乙烯醇冷冻凝胶中来制备吸附剂。氧化石墨烯使用抗坏血酸被还原为还原氧化石墨烯，并且通过与掺入的碳酸钙反应生成二氧化碳气泡产生了分级多孔结构，形成了第二个网络。在萃取目标分析物之前，萃取溶剂被引入到吸附剂的分级孔网络中。萃取是基于分析物与引入的萃取溶剂之间的分配以及分析物在还原氧化石墨烯上的吸附。萃取效率通过多环芳烃与还原氧化石墨烯和萃取溶剂之间的π-π和疏水相互作用得到增强。所提取的多环芳烃通过高效液相色谱法与荧光检测器进行测定。该方法应用于一次性尿布、咖啡和茶叶样品中多环芳烃的提取，回收率为 84.5%至 99.4%，相对标准偏差低于 7%。所开发的吸附剂表现出良好的重现性，可重复使用 10 次。
