Rapid Preparation And Applications Of Novel Ti-based Oxide Nanostructured Coatings For Solid-phase Micro-extraction

SPME has been frequenty used in analysis of trace organic contaminants since its introduction by Pawliszyn and co-workers. However, commercial SPME coatings have some drawbacks including fragility of fiber support, poor thermal instability and resistance to organic solvents, high cost and short life time, limit its further applications. Therefore, in this paper we successfully prepared Ti O2 nanotubes, Ti O2 nanorods, Ti O2 nanosheets and Zr O2 nanoparticles coated SPME fiber using in-situ anodic oxidation and electrochemical physical deposition, which possesses excellent selectivity and adsorption properties. Besides, the extraction properties of the coating were studied and the effects of extraction parameters were investigated and optimized.In Chapter 1, we have summarized and described the sunscreen cosmetics and classification of UV filters, as well as a brief introduction to SPME technique, including its development, theories, in-fluent factors, types of extraction coating and related to preparation technology and practical application.In Chapter 2, a novel fiber for SPME fabricated through the anodization of Ti wire substrates was applied to the determination of the UV filters in environmental water samples. The obtained SPME fibers possess ordered Ti O2 nanotubes coating with 20-30 nm walls and 100-150 nm pores. The current procedure was successfully applied to simultaneous analysis of four UV filters in environmental water samples.In Chapter 3, a novel Ti O2 nanorods coating was investigated for the concentration and determination of polycyclic aromatic hydrocarbons(PAHs), phthalates(PAEs) and UV filters coupled to HPLC-UV. It was found that the Ti O2 nanorods coating exhibited high extraction capability and good selectivity.In Chapter 4, a novel cross-linked Ti O2 nanosheets fiber for SPME was fabricated through in-situ anodization of Ti wire substrates for the first time. The cross-linked Ti O2-nanosheets were employed as the coating for SPME fiber to extract five PAHs, PAEs and UV filters in combination with HPLC-UV. It was found that the as-deposited cross-linked Ti O2-nanosheets exhibited extremely high extraction capability and good selectivity. Furthermore, the cross-linked Ti O2-nanosheets fiber exhibited high affinity, wide linearity, and excellent reproducibility for the SPME of UV filters.In Chapter 5, a novel Ti-Ti O2-Zr O2 fiber for SPME was fabricated by chemical oxidization of a Ti wire substrate and subsequent electrodeposition of Zr O2 nanoparticles coating. In the study, the used SPME fiber can improve the reproducibility of the analysis method and the service life of the fibers.