Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems; Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies; College of the Environment and Ecology, Xiamen University, Xiamen 361005, China.
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
ACS Appl Mater Interfaces. 2021 Aug 11;13(31):37280-37288. doi: 10.1021/acsami.1c11433. Epub 2021 Jul 29.
Magnetic solid-phase extraction (MSPE) based on molecularly imprinted nanoparticles (MINs) has attracted wide attention in sample pretreatment because it combines the merits of high selectivity and quick extraction procedures. However, laborious, time and solvent-consuming steps were involved in the synthesis of magnetic imprinted particles in existing approaches. To circumvent this dilemma, a green and rapid "one-pot" strategy was proposed to prepare MINs. Halosulfuron-methyl (HSM) was selected as a template molecule, and Gaussian 09 simulation software was employed to screen the 2,4,6-trivinylboroxin pyridine complex (TBP) as a functional monomer. Subsequently, the fabrication was simply conducted using a hydrothermal approach by mixing self-assembly solution of TBP-HSM, Fe, Fe, dimethyl sulfoxide, and azobisisobutyronitrile in one-pot with a total reaction time of 3.0 h. Various characterized results well evidenced the successful imprint of HSM and the resultant HSM-MINs presented satisfying superparamagnetism and saturation magnetism. Under the optimized parameters, the obtained HSM-MINs displayed good recognition capability and selectivity toward HSM (recognition coefficient was 2.60), as well as a satisfactory saturation adsorption capacity (1781 μg/g). The quantification of sulfonylurea herbicides at trace levels in environmental water and soil samples was selected as a paradigm to demonstrate the practicality and reliability of HSM-MINs/MSPE. The present study provides a convenient, reliable, and green approach for fabricating a magnetic molecular-imprinting adsorbent for MSPE.
基于分子印迹纳米粒子（MINs）的磁固相萃取（MSPE）因其高选择性和快速萃取程序的优点而在样品预处理中受到广泛关注。然而，现有的方法在合成磁性印迹颗粒时涉及到繁琐、耗时和耗溶剂的步骤。为了规避这一困境，提出了一种绿色快速的“一锅法”策略来制备 MINs。以氯磺隆（HSM）为模板分子，采用 Gaussian 09 模拟软件筛选 2,4,6-三乙烯基硼酸吡啶络合物（TBP）作为功能单体。随后，通过在一锅中共混 TBP-HSM、Fe、Fe、二甲基亚砜和偶氮二异丁腈的自组装溶液，采用水热法简单制备，总反应时间为 3.0 h。各种特征结果充分证明了 HSM 的成功印迹，所得的 HSM-MINs 表现出令人满意的超顺磁性和饱和磁化强度。在优化的参数下，所得的 HSM-MINs 对 HSM 表现出良好的识别能力和选择性（识别系数为 2.60），以及令人满意的饱和吸附容量（1781μg/g）。选择痕量环境水样和土壤样品中磺酰脲类除草剂的定量分析来证明 HSM-MINs/MSPE 的实用性和可靠性。本研究为制备用于 MSPE 的磁性分子印迹吸附剂提供了一种方便、可靠和绿色的方法。
