The functionalization of covalent organic frameworks (COFs) enhances chemical properties and expands future applications. Herein, a facile strategy for sulfoacid-functionalized COF is presented through post-modification of covalent triazine frameworks (CTFs) platform. The magnetic solid phase extraction (MSPE) material is obtained by anchoring in situ Ni particles on CTF support (Ni/CTF-SO3H) possessing a dual retention mechanism combining hydrophilic-lipophilic-balance (HLB) and cation-exchange interaction. We established the (Ni/CTF-SO3H)-MSPE method for selectively enriching carbendazim (CBZ) and thiabendazole (TBZ) from food samples and reducing matrix effect simultaneously. The method detection limit is 1.23-7.05 µg kg-1 for CBZ and TBZ in vegetable, fruit and juice samples, determined by high-performance liquid chromatography-ultraviolet detector. The recoveries of spiked CBZ and TBZ in the samples are 80.2-115.1% and RSDs 6.0-11.4%, depending on both analytes and samples. Our work provides a unique perspective in the development of functionalized COFs as a versatile HLB/cation-exchange mixed-mode SPE sorbent for extraction of basic analytes in complex matrix.

中文翻译：

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评估磺酸官能化的共价三嗪骨架作为亲水-亲脂平衡/阳离子交换混合模式吸附剂，用于萃取蔬菜，水果和果汁中的苯并咪唑类杀菌剂。

共价有机框架（COF）的功能化增强了化学性质并扩展了未来的应用。本文中，通过共价三嗪框架（CTF）平台的后修饰，提出了一种用于磺酸功能化COF的简便策略。磁性固相萃取（MSPE）材料是通过将原位Ni颗粒锚固在具有双重保留机制的CTF载体（Ni / CTF-SO3H）上而实现的，该机制具有亲水-亲脂平衡（HLB）和阳离子交换相互作用的双重保留机制。我们建立了（Ni / CTF-SO3H）-MSPE方法，用于从食品样品中选择性富集多菌灵（CBZ）和噻菌灵（TBZ）并同时降低基质效应。蔬菜，水果和果汁样品中CBZ和TBZ的方法检出限为1.23-7.05 µg kg-1。用高效液相色谱-紫外检测器测定。样品中加标CBZ和TBZ的回收率分别为80.2-115.1％和RSD 6.0-11.4％，这取决于分析物和样品。我们的工作为功能化COF作为多功能HLB /阳离子交换混合模式SPE吸附剂的开发提供了独特的见解，可用于萃取复杂基质中的基本分析物。