In this work, ultrathin magnetic nitrogen doped graphene tube ([email protected]) is synthetized via a template free graphitization process. The [email protected] as magnetic solid phase extraction adsorbent is used to extract three tetracyclines (TCs), showing the best extraction ability and adsorption capacity than graphene, MWCNT and magnetic MWCNT (NiFe₂O₄/MWCNT). The tubular structure of [email protected] can avoid the aggregation problem, provide higher active surface area and larger conjugated system. The doping of N atom will generate structural defects which will be adsorption sites for three TCs. Furthermore, the [email protected] with magnetic properties is beneficial to the recovery and recycle. The limits of detections (LODs) (S/N = 3:1) are in the range of 1.29–2.31 ng mL⁻¹ with average recoveries from 91.6 to 109.7% in milk samples. The results demonstrate that the [email protected] is a hopeful adsorbent in the MSPE of TCs in real samples.

在这项工作中，通过无模板石墨化工艺合成了超薄磁性氮掺杂石墨烯管（[受电子邮件保护]）。[电子邮件保护]作为磁性固相萃取吸附剂用于萃取三种四环素（TC），与石墨烯，MWCNT和磁性MWCNT（NiFe ₂ O ₄）相比，具有最佳的萃取能力和吸附能力。/ MWCNT）。[电子邮件保护的]管状结构可以避免聚集问题，提供更高的有效表面积和更大的共轭体系。N原子的掺杂将产生结构缺陷，该缺陷将是三个TC的吸附位点。此外，具有磁性的[电子邮件保护]有利于回收和再循环。牛奶样品中的检出限（S / N = 3：1）在1.29–2.31 ng mL ^-1范围内，平均回收率在91.6％至109.7％之间。结果表明，[电子邮件保护]是真实样品中TC的MSPE的理想吸附剂。