کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5135453 | 1493437 | 2017 | 9 صفحه PDF | دانلود رایگان |
- One-pot, low-cost and reproducible g-C3N4 grafting onto silica microparticles.
- g-C3N4@silica novel application for SPE of Fluoroquinolones from natural water.
- Quantitative recovery in tap and raw river waters (low ng Lâ1).
- Good precision and sensitivity for g-C3N4@silica SPE coupled to HPLC-FD.
- g-C3N4@silica advantageous in terms of preparation, cost, efficiency, reusability.
The analytical application of silica-supported graphitic carbon nitride (g-C3N4@silica) for solid-phase extraction (SPE) of fluoroquinolone (FQ) pollutants from water is presented for the first time. g-C3N4@silica was easily and quickly prepared by one-pot thermal condensation of dicyandiamide and characterized by powder X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, Fourier transform infrared spectroscopy and surface area measurements. The novel composite was applied as sorbent for SPE of FQs from water prior high-performance liquid chromatography with fluorescence detection. The extraction efficiency of g-C3N4 was tested in tap and surface waters at actual concentrations (10-100 ng Lâ1). Quantitative adsorption was achieved using 100 mg sorbent (20 wt% g-C3N4) for pre-concentration of 50-500 mL sample, at the native pH (â¼7.5-8). Elution was performed with 25 mM H3PO4 aqueous solution-acetonitrile (80:20), obtaining recoveries in the range 70-114%, enrichment factors up to 500 and inter-day RSDs â¤Â 12%. The batch-to-batch reproducibility was assessed on three independently synthesized g-C3N4@silica preparations (RSD 6-12%). g-C3N4 supported on silica microparticles proved to be of easy preparation, inexpensive, reusable for at least 4 extractions of raw surface waters, and suitable for determination in real matrices.
Journal: Journal of Chromatography A - Volume 1489, 17 March 2017, Pages 9-17