Study On Preparation, Characterization And Property Of Metal Oxide Modified Titanium Dioxide Nanotube Arrays

TiO₂nanotube arrays were fabricated by using andization method on a puretitanium foil with the using of ethylene glycol as an organic electrolyte solution andNH₄F as a fluoride ion source. Nanotube arrays have the best performance when thepreparation conditions as follows:50V oxide voltage,30min reacting time,0.3wt%NH₄F concentration. In order to investigate the phase transformation of TiO₂nanotubes under different temperatures, XRD patterns after different heat treatmenttemperatures were made.Cu₂O modified TiO₂nanotube arrays were prepared by constant potentialdeposition and characterized by SEM, XRD. The Optimal preparation conditions weredetermined by Opto-electronic test. Degradation ratio of Cu₂O modified TiO₂nanotube arrays for rhodamine B with a initial concentration of20mg/L could reach83%after120min reaction. Degradation rate constant of Cu₂O modified TiO₂Nanotube Arrays is about200times larger than photodegradation and2times thanelectrical degradation, indicating that the significant photoelectric synergisticcatalytic.ZnFe₂O₄modified TiO₂nanotube arrays is prepared via electrochemicalanodization of pure titanium foil in fluorine-containing ethylene glycol, followed by anovel cathodic electrodeposition method. The SEM showed that the deposition ofZnFe₂O₄is minimized at the tube entrances. XRD patterns proved the existence ofZnFe₂O₄and the EDS spectra show that the Atomic ratio is aproximate1:2for Zn andFe, whicn accord with ZnFe₂O₄.A series of Opto-electronic tests were carried out to determie the optimalpreparation conditions. The experiments of Degradation of rhodamine B showed thatthe photoelectric degradation rate constant of ZnFe₂O₄modified TiO₂nanotube arraysis about6⁷time larger than pure TiO₂nanotube arrays. This show that ZnFe₂O₄modified TiO₂nanotube arrays electro-optical degradation of Rhodamine B is moreefficient.