In this study, ecofriendly and economic carboxy-terminated plant fibers (PFs) were used as adsorbents for the effective in-syringe solid phase extraction (IS-SPE) of fluoroquinolone (FQ) residues from water. Based on the thermal esterification and etherification reaction of cellulose hydroxy with citric acid (CA) and sodium chloroacetate in aqueous solutions, carboxy groups grafted onto cotton, cattail, and corncob fibers were fabricated. Compared with carboxy-terminated corncob and cotton, CA-modified cattail with more carboxy groups showed excellent adsorption capacity for FQs. The modified cattail fibers were reproducible and reusable with relative standard deviations of 3.2%–4.2% within 10 cycles of adsorption-desorption. A good extraction efficiency of 71.3%–80.9% was achieved after optimizing the extraction condition. Based on carboxylated cattail, IS-SPE coupled with ultra-performance liquid chromatography with a photodiode array detector was conducted to analyze FQs in environmental water samples. High sensitivity with limit of detections of 0.08–0.25 μg/L and good accuracy with recoveries of 83.8%–111.7% were obtained. Overall, the simple and environment-friendly modified waste PFs have potential applications in the effective extraction and detection of FQs in natural waters.

在本研究中，生态友好且经济的端羧基植物纤维 (PFs) 被用作吸附剂，用于有效地注射器内固相萃取 (IS-SPE) 从水中的氟喹诺酮 (FQ) 残留物。基于纤维素羟基与柠檬酸（CA）和氯乙酸钠在水溶液中的热酯化和醚化反应，制备了接枝到棉花、香蒲和玉米芯纤维上的羧基。与端羧基玉米芯和棉花相比，具有更多羧基的CA修饰香蒲对FQs表现出优异的吸附能力。改性香蒲纤维具有可重复性和可重复使用性，在 10 个吸附-解吸循环内的相对标准偏差为 3.2%–4.2%。优化提取条件后，提取率达到71.3%~80.9%。基于羧化香蒲，IS-SPE结合光电二极管阵列检测器的超高效液相色谱分析环境水样中的FQs。获得了高灵敏度，检测限为 0.08–0.25 μg/L，准确度良好，回收率为 83.8%–111.7%。总体而言，简单且环保的改性废PFs在天然水体中FQs的有效提取和检测方面具有潜在的应用价值。