Fabrication And Photoelectrocatalytic Properties Of Boron And Cobalt Co-doped TiO₂Nanotube Arrays

The present work aimed to fabricate B-Co co-doped TiO₂nanotube arrays by anodic oxidationand electrodeposition process to solve problems of low quantum yield and low efficiency to solar ofTiO₂photocatalyst.Anodic oxidation process was used as the preparation method in this paper, during thepreparation of the TiO₂nanotube arrays, the element boron was doped to achieve the vario-property,as a result, several boron-doped TiO₂nanotubes array were prepared. FE-SEM results indicate that thenanotube arrays have the thickness of about15nm and length is about950nm, furthermore, there islittle effect on the morphology of the TiO₂nanotube arrays anodized electrolyte by adding fluoridesodium borate to electrolyte. XPS analysis shows B atom doping into the TiO₂lattice exists as theform of Ti-B-O. XRD and DRS analysis show that Boron doped electrode mainly exist as the anatasephase, doping different content of boron all make TiO₂nanotubes absorption spectrum widening tovisible light area, and at the same time, improve the absorption in the ultraviolet,0.52at.%B-TiO₂electrode to improve TiO₂nanotubes visible and ultraviolet absorption the greatest contribution,current density and methyl orange solution processing rate are higher than other doping amount ofelectrode under the same experiment conditions.The ion exchange method was used in the preparation of the boron-cobalt doped TiO₂nanotubearrays from the boron doped TiO₂nanotubes arrays. The experimental results show that when thejoined cobalt acetate concentration is0.02mol/L, the prepared boron-cobalt were doping TiO₂nanotube arrays has the best light absorption performance and photoelectric catalytic activity, FE-SEM results show that the amount of cobalt element doped into TiO₂nanotubes array has rarelyimpact on its morphology. XPS,XRD and DRS analysis results show that the cobalt element in borondoped TiO₂nanotubes array mainly exists in the form of CoO, the doping of cobalt element makes thephotoelectric stability and light response performance of boron doped TiO₂nanotubes array improved;Co²⁺ can capture the electron on the surface of light catalyst, reducing photoproduction electron andthe recombination rate of hole, improving the ultraviolet light absorption performance, at the sametime the edge shift occurred in absorption sideband. Compared to TiO₂nanotube arrays, the efficiencyof removing methyl orange was increased by52.3%under ultraviolet light, while was increased by28.1%under visible light; Compared to boron doped TiO₂nanotubes array, under ultraviolet light, theefficiency of removing methyl orange was increased by14.1%, and it was increased by16.6%when we use visible light condition.We could achieve a remarkable effect in dealing with the refractory organic matter by radiationoxidation technology.This paper focuses on the feasibility of the using TiO₂nanotubes arraycollaborative gamma radiation to processing wastewater. The experimental results show that theexistence of TiO₂nanotubes array obviously improved the degradation rate of waste water. In methylorange dye wastewater with the pH value of3, sodium sulfate concentration of0.4mol/L, TiO₂nanotube arrays and gamma radiation coprocessing achieve the best effect, when the absorbed dose is3KGy, the degradation rate was86.1%, and compared with gamma radiation alone circumstance, thedegradation rate increased by7.9%.