An effective strategy for controlled fabrication and self-assembled modification of template-supported silica nanosheets on a superelastic nickel-titanium alloy fiber for highly efficient solid-phase microextraction

作者：Zhou, Shanshan; Wang, Huiju; Jin, Panxia; Wang, Ziyi; Wang, Xuemei; Du, Xinzhen^*

来源：Journal of Chromatography A, 2018, 1569: 17-25.

DOI：10.1016/j.chroma.2018.07.052

• Silica nanosheets
• Metal oxide nanosheets
• Nickel-titanium alloy wire
• Sol-gel
• Solid-phase microextraction
• Polycyclic aromatic hydrocarbons

Silica nanosheets (SiO(2)NSs) were successfully fabricated on the superelastic nickel-titanium alloy (NiTi) wire as a novel fiber for solid-phase microextraction (SPME). Before sol-gel coating, the NiTi wire was hydrothermally treated in alkaline solution for the in situ growth of NiO/TiO2 nanosheets (NiO/TiO(2)NSs). The sol-gel coating of SiO2 on the surface of NiO/TiO2 NSs template was investigated and a thin shell of SiO2 was found to cover NiO/TiO(2)NSs, which can enlarge the effective surface area of the SiO2 coating. This SiO2 capped NiO/TiO(2)NSs coated NiTi (NiTi@NiO/TiO2@SiO(2)NSs) fiber shows good extraction selectivity for polycyclic aromatic hydrocarbons (PAHs) and enhanced mechanical stability. After the self-assembled modification of SiO2 NSs by phenyltrichlorosilane, the NiTi@NiO/TiO2 @SiO(2)NSs@Ph fiber shows higher extraction capability for non-polar PAHs. Thus, the conditions for the extraction of PAHs were investigated and optimized coupled to HPLC with UV detection. Under the optimized conditions, the analytical parameters of the SPME-HPLC methods with the NiTi@NiO/TiO2 @SiO2 NSs and the NiTi@NiO/TiO2@SiO(2)NSs@Ph fibers were determined and compared. The SPME-HPLC method with the NiTi@NiO/TiO2@SiO(2)NSs@Ph fiber was developed for the concentration and the determination of PAHs in environment water samples. The relative recovery of PAHs in real water samples spiked at 5 mu g L-1, 10 mu g L-1 and 30 mu g L-1 ranged from 88.1% to 109%. Furthermore, this fiber is stable due to the chemical bonding between different coatings and NiTi substrates. The fabrication of the NiO/TiO2@SiO(2)NSs@Ph coating on the NiTi fiber substrate is precisely controllable.

• 出版日期2018-9-28
• 单位西北师范大学