There are few reports on the diversification in adsorption and photo-catalysis caused by morphological changes. In this study, TiO₂ nanotubes (TiO₂ NTs) were synthesized by alkaline hydro-thermal method using commercial TiO₂ nanoparticles (TiO₂ NPs) as raw materials. When TiO₂ nanoparticles are converted to nanotubes, the difference in adsorption and photocatalytic performance was analyzed using methylene blue (MB) as a model pollutant. The results showed that TiO₂ NPs exhibited low adsorption capacity and greater photocatalytic activity for MB. In contrast, TiO₂ NTs showed dual functions of adsorption and photo-catalysis. It exhibited better adsorption performance for MB and the maximum uptake was 102.41 mg/g. However, the photo-catalytic activity changed because the hydro-thermal method altered the crystal structure and increased the gap energy of TiO₂ NTs, which led to the partial reduction of photo-catalytic activity compared to TiO₂ NPs. The dominating free radicals were ·OH, followed by ·O₂⁻ in the process of MB photodegradation by TiO₂ NPs while ·OH and ·O₂⁻ were main radicals in the process of MB photodegradation by TiO₂ NTs. Moreover, 99% MB was degraded in 24 min via adsorption and photo-catalysis synergy under the following optimal conditions: TiO₂ NTs dose = 6 mg, pH = 9, and light intensity = 19 A. Compared with other photo-catalysts reported, TiO₂ NTs exhibited a superior performance through adsorption and photo-catalysis synergy with advantages of faster degradation, less catalyst dose and high efficiency. This work hopes to provide reference for the design and synthesis of materials with dual functions of adsorption and photo-catalysis.

关于形态变化引起的吸附和光催化多样化的报道很少。本研究以碱性TiO ₂纳米颗粒（TiO ₂ NPs）为原料，通过碱水热法合成了TiO ₂纳米管（TiO ₂ NTs）。当TiO ₂纳米颗粒转化为纳米管时，使用亚甲基蓝（MB）作为模型污染物分析了吸附和光催化性能的差异。结果表明，TiO ₂ NPs对MB具有较低的吸附能力和较高的光催化活性。相反，TiO ₂NT显示出吸附和光催化的双重功能。它对MB的吸附性能更好，最大吸收量为102.41 mg / g。然而，由于水热法改变了晶体结构并增加了TiO ₂ NTs的能隙，因此光催化活性发生了变化，与TiO ₂ NPs相比，导致光催化活性的部分降低。占主导地位的自由基是·OH，然后·O2 ₂ ^-以MB为单位的光降解，以TiO过程_2个纳米颗粒而·OH和·O2 ₂ ^-均MB降解的过程主要通过自由基的TiO ₂新台币。此外，在以下最佳条件下，TiO ₂ NTs剂量= 6 mg，pH = 9，光强度= 19 A，在24分钟内通过吸附和光催化协同作用降解了99％MB 。与其他报道的光催化剂相比， TiO ₂ NTs通过吸附和光催化协同作用表现出优异的性能，具有降解速度快，催化剂用量少和效率高的优点。这项工作希望为具有吸附和光催化双重功能的材料的设计和合成提供参考。