Preparation And Modification Of Ti - Based One - Dimensional Titanium Dioxide Nanomaterials And Their Photocatalytic Properties

With the further development of nanotechnology research, semiconductormaterials have been more widely used in various fields. Titanium dioxide has beenmore and more attention in the application of environment and energy by its chemicalstability, photocatalytic activity, nontoxic and cheap. Now, various morphology ofTiO2nanomaterials have been prepared, such as nanoparticle, nanorod, nanofilm,nanowire, nanotube, etc. In the year of2001, TiO2nanotube arrays based on the Tifoil has been obtained by anodization for the first time, and attracting the greatinterests of researchers immediately. By the year of2009, Aydil’s group and Grimes’group reported that the rutile TiO2nanowire arrays grew on the FTO substrate directlyby the solvothermal method at the same time, and applicated in DSSC showedremarkable photon-to-current conversion efficiency. The materials of theone-dimenional array nanostructure have a wide range of applications in environmentand energy for the aligned array structure, large specific surface area, photocatalyticactivity and excellent charge flow route. What is more important, Ti foil as thesubstrate which has a favorable contact with TiO2for the electron transport, thatmakes TiO2nanomaterials develop its application in the photoelectrocatalysis.However, TiO2has several problems as the photocatalyst such as narrow lightabsorption spectrum, low solar energy utilization, high recombination of electrons andholes to adapt the particle use. Recent a large number of researches have tendency todesign the photocatalyst of the wide spectrum response and high quantum efficiency.Hereto, in this study TiO2nanomaterials arrays based on the Ti were prepared bydifferent process and modified to widen the absorption spectrum for visible lightapplication. On the other hand, photoelecatalysis method has been applied to restrainthe recombination of charge carrier and improve the efficiency of reaction. The mainresearch results are as follow:1. Size-controled noble metal nanoparticles loaded on TiO2nanotube arrays bypulse-electrodeposition methode for the visible light driven applications. The methode of pulse-electrodeposition is simple and universal for deposition ofmetal nanoparticle, the heterostructure between metal and TiO2is fastness and stable.The size of metal nanoparticle can be controlled through changing the condition of thepreparation. Different plasmon response activities with the different noble metalnanoparticle load on the TiO2.2. Photoelectrochemical Generation of Hydrogen and Simultaneous Degradationof Organic Pollutant with CdSe/TiO2Nanotube Arrays as Photoanode underVisible Light.CdSe/TiO2Nanotube Arrays electrode (CdSe/TNTA) was successfully prepared byelectrodeposition with ion-exchange method. The composite material electrodeshowed both high generation of hydrogen efficiency and effective MO decompositionefficiency in the photoelectrocatalysis reaction system under visible light. The organicpollutant (MO) can be degraded and also can promote the generation of hydrogen byimpact H-metal bond on the cathode in the system. The CdSe/TiO2Nanotube Arrayselectrode material can help design facility that generation of hydrogen andsimultaneous degradation of organic pollutant at the same time, which fit for industryapplication and environment requirement.3. Fabrication and photoelectrochemical propertise of rutile TiO2nanowirearrays electrode based on the Ti foil by the one-step hydrothermal methode.Facile and simple preparation condition to get rutile TiO2nanowire arrays by one-stephydrothermal on Ti foil as the substrate at the same time as the titanium source forfirst time. The various characterization methods have been used for studying thestructure, crystal phrase and charge transport properties of material. The morphologyformation and growth mechanism of the TiO2nanowire arrays have been discussedthrough changing the constitution of raw materials. The photoelectrocatalyticperformances of TiO2nanowire arrays were investigated. In addition, the extrinsiclight absorption of electrode material has been observed in the visible area.