Wang Guanhua, Zhou Tong, Lei Yongqian
College of Veterinary Medicine, South China Agricultural University Guangzhou 510642 Guangdong PR China
Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Guangdong Engineering Technology Research Center of On-line Monitoring of Water Environmental Pollution, Guangdong Institute of Analysis Guangzhou 510070 China
RSC Adv. 2020 Mar 20;10(20):11557-11564. doi: 10.1039/c9ra10846g. eCollection 2020 Mar 19.
Covalent organic frameworks (COFs) are a new class of porous materials with a large surface area and potential superiority in sample pretreatment. Herein a novel triazine-based COF named SCAU-1 was fabricated a hydrothermal method, and SNW-1 was also prepared as a contrastive COF material. After characterization, SCAU-1 was used as solid-phase extraction (SPE) adsorbent to concentrate five sulfanilamides (SAs) and four tetracyclines (TCs). Several parameters were investigated in the extraction process, including the amount of adsorbent, the flow rate, the washing and elution solvent, the loading capacity and breakthrough volume. After detected by UPLC-MS/MS, the results revealed that SCAU-1 showed high extraction efficiency towards the selected antibiotics. According to the comparison with SNW-1, SCAU-1 showed better performance for the adsorption of TCs. While for SAs, the recoveries of SCAU-1 is close to that of SNW-1. The LODs are from 0.031 to 0.55 μg L, and the recoveries are from 88.0% to 93.4% for SCAU-1 with the RSDs ranging from 2.5% to 4.8%. The results demonstrated that SCAU-1 is a kind of promising adsorbent for the enrichment of organic pollutants.
共价有机框架材料（COFs）是一类新型多孔材料，具有较大的表面积，在样品预处理方面具有潜在优势。本文采用水热法制备了一种新型的基于三嗪的COF，命名为SCAU-1，并制备了对比性COF材料SNW-1。经过表征后，将SCAU-1用作固相萃取（SPE）吸附剂，用于富集五种磺胺类药物（SAs）和四种四环素类药物（TCs）。在萃取过程中研究了几个参数，包括吸附剂用量、流速、洗涤和洗脱溶剂、负载量和穿透体积。经超高效液相色谱-串联质谱（UPLC-MS/MS）检测，结果表明SCAU-1对所选抗生素具有较高的萃取效率。与SNW-1相比，SCAU-1对TCs的吸附性能更好。而对于SAs，SCAU-1的回收率与SNW-1接近。SCAU-1的检测限为0.031至0.55 μg/L，回收率为88.0%至93.4%，相对标准偏差（RSD）为2.5%至4.8%。结果表明，SCAU-1是一种有前景的用于富集有机污染物的吸附剂。
