Hydrogen titanate nanotubes with different Ti/NaOH ratios were synthesized using the hydrothermal method. The obtained materials were characterized by X-ray diffraction, UV–vis DRS spectroscopy, N₂ physisorption, transmission electron microscopy and zeta potential. According to the characterization results, all the synthesized materials presented tubular morphology and the crystalline phase corresponding to H₂Ti₃O₇. The synthesis parameters were optimized in order to increase as much as possible the specific surface area and minimize the sodium ion concentration as well. Afterward, the produced nanotubes were used as adsorbent materials to remove basic fuchsin dye from water solutions. The best adsorption performance, up to 90% in the first 5 min of testing using a load of 0.05 mg_NT L⁻¹_BF, was achieved for the sample that showed the highest specific surface area (393.3 m² g⁻¹); the results for the other samples were around 60% under the same experimental conditions. As expected, the adsorption values were correlated to the specific surface area and point of zero charge values; in this case, at optimal pH (2.4), negatively charged NTs could capture the BF dye (pKa of 3.9) via electrostatic attraction and then ion-exchange or complexation. Through UV–vis DRS and FTIR spectroscopies, a strong interaction of the amino group in the H₂Ti₃O₇ surface was elucidated. The results presented in this work make possible the use of this kind of materials as adsorbents of certain types of contaminants in water purification processes due to their adsorptive properties in continuous cycles.

采用水热法合成了不同Ti / NaOH比的钛酸氢纳米管。获得的材料通过X射线衍射，UV-vis DRS光谱，N ₂物理吸附，透射电子显微镜和zeta电位进行表征。根据表征结果，所有合成材料均表现出管状形态，且结晶相对应于H ₂ Ti ₃ O _7。。为了尽可能增加比表面积并使钠离子浓度最小化，对合成参数进行了优化。之后，将产生的纳米管用作吸附材料，以从水溶液中去除碱性品红染料。对于显示最高比表面积（393.3 m ²  g ^-1）的样品，在测试的前5分钟使用0.05 mg _NT L ^-1 _BF的负载可获得最佳吸附性能，最高可达90％。）; 在相同的实验条件下，其他样品的结果约为60％。如所预期的，吸附值与比表面积和零电荷值点相关。在这种情况下，在最佳pH（2.4）下，带负电荷的NTs可以通过静电吸引然后进行离子交换或络合而捕获BF染料（pKa为3.9）。通过紫外可见DRS和FTIR光谱，阐明了H ₂ Ti ₃ O ₇表面中氨基的强相互作用。这项工作提出的结果使这种材料有可能在水净化过程中用作某些类型污染物的吸附剂，因为它们在连续循环中具有吸附性能。