title: Innovative fabrication of the flower-like nanocomposite coating on a nitinol fiber through Fenton's oxidation for selective and sensitive solid-phase microextraction.
abstract: A novel flower-like nanostructure was successfully in situ fabricated on the surface of nitinol wire through Fenton's oxidation for the first time. It was found that the densely immobilized coating on the surface of the nitinol fiber was composed of nickel and titanium oxide nanocomposite (NiO/TiO2NC). The NiO/TiO2NC coated fiber was used to extract aromatic compounds coupled with high performance liquid chromatography (HPLC) with UV detection and exhibited excellent extraction efficiency for polycyclic aromatic hydrocarbons (PAHs) with larger delocalized π-system among the studied analytes. Important factors affecting extraction efficiency of PAHs were examined. Under the optimized conditions, the calibration curves were linear in the range from 0.05 to 500μgL(-1) with correlation coefficients of R(2)≥0.999, and the lowest limit of detection of 0.006μgL(-1) was achieved for benzo[a]pyrene. Furthermore, the intra-day and inter-day precisions for the single fiber varied from 4.69% to 5.97% and from 5.28% to 6.32% for five replicates of PAHs at the spiking level of 50μgL(-1), respectively. The fiber-to-fiber precision for five fibers prepared in different batches ranged from 6.19% to 8.35%. The developed method was successfully applied to concentration and determination of target PAHs from real environmental water samples. Moreover, this novel nitinol-based fiber exhibited long lifespan. Therefore, the proposed fiber can be used as a promising candidate for a conventional fused silica-based fiber in SPME.
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhen
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Huiju
authors.initials: H
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Mei
authors.initials: M
authors.lastname: Guo
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Zhou
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China; Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu, Lanzhou 730070, China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China; Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu, Lanzhou 730070, China. Electronic address: duxz@nwnu.edu.cn.
authors.forename: Xinzhen
authors.initials: X
authors.lastname: Du
keywords: Aromatic compounds; Fenton's oxidation; Nickel and titanium oxide nanocomposite; Nitinol fiber; Polycyclic aromatic hydrocarbons; Solid-phase microextraction