Abstract
In this paper, the Fe3+ doped rutile phase TiO2 nanotubes arrays (NTAs) were prepared in a low temperature water-assistant crystallization method. It is noteworthy that the Fe3+ doping hardly hinders either the crystallization of rutile TiO2 NTAs or the highly-ordered nanotubular morphologies. Moreover, Fe3+ did not form other compound impurities, which indicated that Fe3+ substitute Ti4+ into the lattice of TiO2. With the introduction of Fe3+, the light absorption range of TiO2 NTAs extends from the ultraviolet band to the visible light range. Photocatalytic testing results indicate that Fe3+ doped TiO2 NTAs can effectively improve the degradation rate of methyl orange aqueous solution in visible light, and the TiO2 NTAs with 0.2 mol/L Fe3+ doping exhibits the highest photocatalytic degradation efficiency.
Highlights
TiO2, as one of the most important derivatives of titanium, has been widely used in photocatalytic degradation of organic pollutants, hydrogen generation by water splitting, solar cells, lithium-ion batteries, sensors, and so on
In order to facilitate recycling, we proposed a simple and low-cost preparation process of Fe3+-doped TiO2 nanotube arrays (NTAs) on Ti foil under mild environment
Various characterization and experimental results indicate that the prepared Fe3+ doped TiO2 NTAs have good photocatalytic activities for the degradation of organic substance under visible light irradiation
Summary
TiO2, as one of the most important derivatives of titanium, has been widely used in photocatalytic degradation of organic pollutants, hydrogen generation by water splitting, solar cells, lithium-ion batteries, sensors, and so on This is due to its excellent photochemical activities, good electronic properties, low cost, and being non-toxic to environments [1,2,3,4,5,6,7]. As a photocatalyst, TiO2 nanotubes and nanoparticles share the same defects Their wide band gap makes them insensitive to visible light, which greatly reduces the utilization efficiency of sunlight [11,12,13,14]. Various characterization and experimental results indicate that the prepared Fe3+ doped TiO2 NTAs have good photocatalytic activities for the degradation of organic substance under visible light irradiation
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