Castillo Pável César Hernández-Del, Castro-Velázquez Verónica, Rodríguez-González Vicente
División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., SLP, 78216, San Luis Potosi, Mexico.
Environ Sci Pollut Res Int. 2025 Apr;32(16):10553-10568. doi: 10.1007/s11356-023-30215-2. Epub 2023 Oct 7.
This research evaluated HTiO nanotubes (TiNTs) functionalized with 1 (1TiCN), 5 (2TiCN), and 10 (3TiCN) wt.% of chitosan for the removal of clonazepam by an adsorption/photocatalysis-conjugated method. The samples were immobilized on glass, and their mechanical stability was tested by washings. The functionalization of the samples was verified by the FTIR and DRS techniques. SEM images displayed nanotubes in the samples and thickness of 4.24 μm for the 2TiCN coating. The chemical composition of the 2TiCN coating was obtained by EDS. The XRD patterns evidenced chitosan and titanate phases in the functionalized samples. Furthermore, the 2TiCN coating was evaluated in the removal of clonazepam, reaching 80.79% (4.38 and 49.64% more than the TiNT and commercial TiO powders, respectively) after 240 min and being 6.88% more efficient after 4 reuses than the 2TiCN powders. OH ions were the main oxidizing species found by scavenger tests. The surface area of 2TiCN (168.6 m/g) was 2 times higher than that of TiNTs, and its bandgap (2.95 eV) was the lowest. Therefore, the 2TiCN coating is an excellent alternative to remove clonazepam.
本研究评估了用1（1TiCN）、5（2TiCN）和10（3TiCN）重量百分比的壳聚糖功能化的HTiO纳米管（TiNTs），通过吸附/光催化共轭法去除氯硝西泮的效果。将样品固定在玻璃上，并通过洗涤测试其机械稳定性。通过FTIR和DRS技术验证了样品的功能化。SEM图像显示了样品中的纳米管，2TiCN涂层的厚度为4.24μm。通过EDS获得了2TiCN涂层的化学成分。XRD图谱证明了功能化样品中存在壳聚糖和钛酸盐相。此外，对2TiCN涂层进行了氯硝西泮去除评估，240分钟后去除率达到80.79%（分别比TiNT和商用TiO粉末高4.38%和49.64%），并且在4次重复使用后比2TiCN粉末的效率高6.88%。清除剂测试表明OH离子是主要的氧化物种。2TiCN的表面积（168.6 m²/g）是TiNTs的2倍，其带隙（2.95 eV）最低。因此，2TiCN涂层是去除氯硝西泮的极佳选择。
