Abstract
Lanthanum/manganese-doped TiO2 nanotube arrays (La/Mn-TNAs) can provide a greater catalytic area and possess stronger photocatalytic activity than TiO2 nanotubes (Li et al. in Nano Res 8(3):900–906, (2015)). Due to the wide band gap, TiO2′s capacity to capture visible light is low, and TiO2 (3.2 eV) can only absorb ultraviolet light. To resolve this issue, most researchers doped TiO2 with nitrogen. In this paper, we doped transition metal ions and rare earth metal ions in TiO2 nanotube arrays to decrease their band gaps, improving the activities of photocatalysts. In addition, La/Mn-TNAs were obtained by anodizing a Ti foil in the electrolyte. Additionally, the photocatalytic activity of the sample was evaluated by analyzing the degradation rate of organic pollutants. As a result, when the Ti foil was anodic oxidation for 3 h and contained 4.8 wt% of lanthanum and manganese, it could degrade organic dyes entirely in 60 min and the degradation rate of organic dyes was over 95%. Thus, La/Mn-TNAs can satisfy people’s requirement of rapid degradation of organic pollutants.
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