Self-assembly of silica nanosheets on titanium fibers for solids-phase microex⁃traction of UV absorbers in environmental water samplesEI北大核心CSCD

Silica nanosheets （SiO2NSs）were successfully assembled on titanium （Ti）wires by sol-gel method. TiO2 nanosheets （TiO2NSs）were grown in situ on Ti wires using anodic oxidation in a fluoride-containing electrolyte to obtain Ti@TiO2NSs. The Ti@TiO2NSs@SiO2NSs fibers were obtained by coating Ti@TiO2NSs with SiO2NSs. It was characterized by scanning electron microscopy （SEM） and X-ray energy dispersive spectroscopy （EDS）. The fibers were used for solid-phase microextraction of ultraviolet absorbers （UVFs）. Under the optimized conditions, six UVFs presented good linearity with the correlation coefficients （R2） greater than 0.999, and the limits of detection （LODs）ranged from 9 to 59 ng/L. The intra-day and inter-day relative standard deviations （RSDs） were from 4.3% to 5.1% and 4.6% to 5.8% for a single fiber at the spiked level of 25 μg/L, respectively. The developed method was successfully applied to the selective enrichment and determination of target UVFs in environmental water samples with recoveries from 93.2% to 108.1% and RSDs from 4.5% to 7.1%. Moreover, the fiber can be fabricated in a precisely controllable manner and is stable for at least 200 extraction and desorption cycles. © 2023, Youke Publishing Co.,Ltd. All rights reserved.