石墨烯、二氧化鈦納米線組裝體的功能化設(shè)計(jì)及可控合成
[Abstract]:The low-dimensional structure system represented by the geometrical morphology of one-dimensional nano-fiber, nano-rod, nanotube and the like contains rich and colorful chemical and physical phenomena, and has been a leading edge and a hot spot in the field of materials. The effective integration and assembly of single material is an effective way to achieve the breakthrough of performance. In this paper, a new type of two-dimensional redox graphene (RGO)/ nano-wire mesh filter is obtained by the ordered assembly and controlled synthesis of the graphene and Ti02 nanowires, and the adsorption performance of the pollutants in the water is excellent in the continuous flow reaction. In this paper, a new one-dimensional RGO/ TiO2 nanowire is also controlled, and an exploratory study on the electrical properties of a single nanowire has been developed. The main contents are as follows: (1) The size of the oxidized graphene (GO) prepared by the modified Hummer method is finely controlled by adopting the ultrasonic crushing method, and the size of the GO is gradually reduced by less than 0.5. m As the ultrasonic crushing increased to 32 min, the reduction reaction of GO resulted in the formation of RGO. Therefore, the time of ultrasonic crushing is optimized to be 16 min. At this time, the size of GO is less than 0.5gm, and the oxidation state is kept, so that the assembly work with Ti02 can be carried out. (2) adopting a hydrothermal method to controllably synthesize the titanate nanowire with the P25 as a precursor, the growth mechanism of which is: i) in the hydrothermal reaction, the Ti02 particles are first cured, that is, the particles of the smaller particle size are gradually dissolved, and the particles of the larger particle size gradually grow, And the OH-and H20 in the NaOH solution enter the Ti02 crystal grain and react with the titanium atom or the oxygen atom in the crystal lattice to generate the titanium hydroxyl group, so that the Ti02 particles are loose and porous, and the porous large-diameter ball is gradually formed. Ii) as the reaction proceeds, the sodium titanate is formed due to the intercalation action of the Na + ions, the sodium titanate nano-band is formed on the surface of the spherical particles, the sheet layer continuously extends out and grows, and finally the sphere is broken, and the sodium titanate nano-band is left. And iii) under the action of the splitting mechanism, the sodium titanate layer is separated to form an ordered nanowire bundle form, and after the ultrasonic dispersion, the nanowires in the wire harness are separated, and finally the nano-wire is formed. In addition, four kinds of nano-materials with different shapes are obtained by finely adjusting the alkali kind, the hydrothermal time and the acid-washing condition of the hydrothermal reaction, and the porous nano-spheres, the nanoribbons, the nanowires and the nanotubes are obtained. The graphene which is different in size is compounded with the sodium titanate nano wire according to different proportions to generate a composite of the "sea urchin", the "interweave film", the titanate nano tube and the graphene oxide ordered interweave. And (3) carrying out controllable assembly of the titanate nano wire and the GO to obtain a two-dimensional (RGO)/ titanate nanowire mesh filter membrane. The assembly mechanism of the GO is as follows: i) the GO attacks the titanate nanowire under the non-covalent interaction with the Van der Waals force; ii) the GO sheet is spontaneously rolled and coated on one or adjacent multiple titanate nano wire surfaces; and iii) after the water is added, the GO is reduced to RGO, so that the reduced surface free energy can be reduced, The RGO on different nanowires is attracted to each other; the RGO at the node attracts more free RGO to the surface in the solution, so that the RGO of the cross-linking point is thickened and the cross-linking is more stable. And finally, a two-dimensional RGO/ titanate nanowire mesh film is formed. And (4) a novel microfiltration membrane-forming device is designed, which consists of a syringe, a micro sample injector and a filter head. Through the fine regulation of the flow rate, volume, pressure, time and other variables of the film-forming process, the titanate nano-wire and the RGO are quickly and uniformly assembled into a film. The two-dimensional RGO/ titanate nano-wire mesh filter membrane prepared by the device is smooth in surface, uniform in color and self-supporting, and the membrane structure is still intact after multiple times of bending. The aqueous solution of rhodamine B is used as a model, the RGO/ titanate nano-wire filter membrane and the decoloring rate are as high as 98%, and the organic pollutants in the aqueous solution can be effectively removed. In which, the titanate nanowire is used as a framework for supporting the graphene and effectively avoids the agglomeration of the graphene, and the graphene has rich adsorption activity bits and has an efficient adsorption effect. After the filter membrane is saturated, the adsorbed organic matter is removed by using an aqueous solution of hypochlorous acid and can be regenerated. (5) RGO/ TiO2 nanowires were prepared by electrostatic spinning, and a single RGO/ TiO2 nanowire electrical test platform was set up in a transmission electron microscope (TEM) chamber, and the rectification curve of a single fiber was successfully measured by in-situ electrical characterization technology. The change of the micro-structure of the nano-wire was observed by multiple times of power-on. This is of great significance for the data analysis of the electrical properties of one-dimensional fiber in the later study.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TB383.1
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