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Studies on the Preparation and Application of Single-walled Carbon Nanotubes Solid-phase Microfibers Based on Sol-gel Technology

Author: SunYin
Tutor: WangChengMing
School: Huazhong Agricultural University
Course: Of Food Science
Keywords: Single - walled carbon nanotubes Solid phase micro extraction Headspace Analysis Sol-gel
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 136
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Abstract


Carbon nanotubes have unique structure and excellent physical and chemical properties, and there are broad prospects for application in the field of materials, biosensors, catalyst supports, biological medicine and separation science. Carbon nanotubes, especially single-walled carbon nanotubes (SWNTs), has a large specific surface area and strong adsorption capacity, the performance of pre-enriched material. But the carbon nanotube is composed of a plurality is composed of carbon atoms in the aromatic adventitious domain system of macromolecules, and practically insoluble in any solvent in the solution easily gathered into a bundle, which greatly limits their application in various fields. Improve the solubility of carbon nanotubes functionalized carbon nanotubes, to provide a broad application space. Solid phase micro-extraction technology, set sampling, extraction, concentration, and in one injection, in recent years, a new type of sample pre-treatment technology, has been obtained in many areas of environmental analysis, food, bio-pharmaceutical successful application, but Most commercial fiber coating are adsorbed on the surface of the extraction head by physical methods, the disadvantage of this coating is the lack of thermal stability, limited life, limiting its wide range of applications. Extraction coating samples strong adsorption, can greatly improve the analytical sensitivity. Therefore, the core of the solid phase microextraction SPME fiber coating material. High adsorption, high sensitivity, high temperature, long life of the coating material is a solid phase micro-extraction technology research focus. In this paper, by carboxylated single-walled carbon nanotubes, chloride, and polymer-functionalized using the sol-gel method carboxylated functionalized polyethylene glycol and hydroxy-terminated silicone oil functionalized single-walled carbon nano- pipe coating. Organochlorine pesticides, chlorophenols, alkylphenols, organochlorine carrier, and polybrominated diphenyl ether waiting for the analysis and evaluation of the measurement was to examine the performance of the three kinds of coating. To carry out a study of the application of coatings involved in areas such as the environment, food and industrial products. The main contents are as follows: a literature review. Briefly describes the types of carbon nanotube structure, physical and chemical properties as well as their common preparation method research progress. Introduces carbon nanotubes in analytical sciences, including carbon nanotubes as gas chromatography and liquid chromatography stationary phases, electrochemical analysis, used as a solid-phase extraction and solid phase micro-sample processing Research progress of extraction preconcentration materials. Sol - gel coating system technology at the same time concise introduction. 2, the preparation of functionalized single-walled carbon nanotubes and its sol-gel coating. Modified by carboxylation chloride polymer-functionalized single-walled carbon nanotubes, combined with the sol-gel technique to prepare carboxylated single-walled carbon nanotubes sol-gel coating (TSO / of SWNTs) polyethylene glycol functionalized single-walled carbon nanotube coating (SWNTs-PEG) and coating the terminal hydroxyl silicone oil functionalized single-walled carbon nanotubes (SWNTs-TSO), three kinds of solid phase microextraction coating. Experiment by Fourier transform infrared spectroscopy, Raman spectroscopy of the modified product characterization, confirmed the structure of the synthesized product is credible; evaluation of the morphology of the coatings obtained by electron microscopy scanning electron microscopy. 3, carboxylated single-walled carbon nanotubes sol-gel coating performance evaluation of its application. The TSO / SWNTs using homemade coating, headspace solid phase micro-extraction waters chlorophenols and organochlorine pesticides. Compared with commercial solid-phase microextraction coating, the new coating showed a higher sensitivity and selectivity. 6 analytes Optimized solid phase extraction conditions were: 50 ° C conditions 30min, 0.09gmL-1 sodium chloride, was extracted the magnetic stirrer rate of 900 rev / min and resolved under 250 ° C the conditions for 3 min. The precision of the method is less than 8.2%, and the reproducibility between the homemade coating of less than 10.8%. The organochlorine pesticides linear range 2-1000 ng L-1, the the rather chlorophenol linear range of 20-1000 ng L-1. The detection limit from 0.07 to 4.36 ng L-1 between. In addition, TSO / SWNTs coating can alkylphenols and bisphenol A pure water the good enrichment capacity at the same time, in the detection of three analytes in water with FID Gas Chromatography lower limit, with good reproducibility, the spiked recoveries between 89% -94%. 4, the polyethylene glycol functionalized single-walled carbon nanotubes sol-gel coating performance evaluation of its application. SWNTs-PEG coating extraction amount in the simulation of sweat optimization: for extraction for 30 min at 40 ° C extraction temperature and salt concentration of 0.36 g mL-1, resolved at 300 ° C for 3 min. With commercial PA, PDMS and PDMS / DVB coating contrast of SWNTs-PEG coating on the organochlorine the extraction performance significantly better than the commercial solid-phase microextraction coating. SWNTs-PEG coating has a higher temperature resistance and longer service life. Established wide linear range, low detection limit, good precision. Finally, the established trace organochlorine carrier detection textiles headspace solid phase micro extraction analysis shows the wider applications of the coating and better prospects. 5, the end of the performance evaluation of its application of hydroxy silicone oil functionalized single-walled carbon nanotubes sol-gel coating. 7 polybrominated diphenyl ethers, to optimize the impact of SWNTs-TSO coating extraction amount more influential factors. The detection limit of the method of 0.08-0.8 ng L-, linear range of 5-500 ng L-, the relative standard deviation of 2.3% -7.4% of SWNTs-TSO coating of polybrominated diphenyl ether extraction performance is significantly better than the commercial solid phase microextraction coating. Low-established method detection limit, wide linear range, good precision. Finally, SWNTs-TSO coating, combined with headspace solid phase micro extraction and gas chromatography - electron capture detection method for the determination of polybrominated diphenyl ethers in river water and wastewater.

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