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 ther...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 adsorptiondesorption.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 mg/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.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.:81703469 and 81973277)Open Fund of the State Key Laboratory of Quality Research in Chinese Medicine,University of Macao(Grant No.:SKL-QRCM(UM)-2020-2022,QRCM-OP21007)the World-Class Universities(Disciplines)and the Characteristic Development Guidance Funds for the Central Universities(Grant No.:PY3A012).
文摘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 adsorptiondesorption.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 mg/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.
