Citation: WANG Zhuo, WANG Fei-Fei, WANG Zi-Yi, ZHANG Rong, DU Jun-Liang, WANG Xue-Mei, DU Xin-Zhen. A Novel Titania Nanowire Fiber for Selective Solid-Phase Microextraction of Ultraviolet Filters in Environmental Water Samples[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(8): 1276-1282. doi: 10.19756/j.issn.0253-3820.191117 shu

A Novel Titania Nanowire Fiber for Selective Solid-Phase Microextraction of Ultraviolet Filters in Environmental Water Samples

1.
College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China;
2.
Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu, Lanzhou 730070, China

Received Date: 1 March 2019
Revised Date: 26 June 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No.21765020).

Titania (TiO₂) has high thermal and chemical stability, unique nanostructure-forming ability and good adsorption, and can be used as a solid-phase microextraction (SPME) fiber coating. In this work, TiO₂ nanowires (TiO₂NWs) were in-situ grown on Ti wire by electrochemical anodization. Thereafter, the Ti@TiO₂NWs fiber was annealed at 800℃ and the nanoparticle-like TiO₂NWs coating was obtained on the Ti fiber substrate. Coupled to high-performance liquid chromatography with ultraviolet detection (HPLC-UV), SPME performance of the annealed Ti@TiO₂NWs fiber was evaluated using typical aromatic compounds as model analytes. As compared with the commercial polyacrylate fiber, the annealed Ti@TiO₂NWs fiber showed good extraction selectivity and high extraction capability for ultraviolet filters (UVFs). The experimental conditions for the extraction of UVFs were optimized. The established SPME-HPLC-UV method with the annealed Ti@TiO₂NWs fiber presented linear ranges from 0.05 μg/L to 300 μg/L with correlation coefficients (R²)>0.999 and limits of detection from 0.005 μg/L to 0.045 μg/L. Relative standard deviations (RSDs) were below 5.4% and 6.4% for intra-day and inter-day analyses of UVFs at the spiking level of 50 μg/L with the single fiber (n=5), respectively. The developed method was successfully applied to the selective enrichment and sensitive determination of target UVFs in environmental water samples with recoveries from 85.0% to 113% and RSDs from 4.2% to 7.8%. Moreover, the annealed Ti@TiO₂NWs fiber was fabricated in a precise controllable manner and stable for at least 200 extraction and desorption cycles.
- Titania nanowires,
- Titanium fiber,
- Anodization,
- Annealing,
- Solid-phase microextraction,
- Ultraviolet filters
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