División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., 78216, San Luis Potosí, SLP, Mexico.
División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., 78216, San Luis Potosí, SLP, Mexico.
Chemosphere. 2023 Oct;339:139628. doi: 10.1016/j.chemosphere.2023.139628. Epub 2023 Jul 29.
In the present research work, the photocatalytic evaluation of NiTiO nanoparticles immobilized on glass plates by the spin-coating procedure was carried out in the degradation of the recalcitrant herbicide 2,6-dichlorobenzamide (BAM). The concentrations of Ni employed to synthesize NiTiO nanoparticles were 1 wt% (1TESNi) and 2 wt% (2TESNi). The stability of coatings was evaluated by several washings and thermal treatments, which were verified by UV-vis analyses. The morphology of the coatings was studied by scanning electron microscopy (SEM-EDS). The coatings displayed thickness values of 1.35 and 2.56 μm for TiO and 1TESNi, respectively. The crystalline phases of the coatings were analyzed by X-ray diffraction (XRD), confirming the presence of NiTiO and other phases related to TiO. The bandgap of 1TESNi, compared with the bare TiO, was reduced from 2.96 to 2.40 eV as a consequence of Ni addition. The TiO, 1TESNi and 2TESNi coatings were evaluated in the photodegradation of BAM using visible-light for 240 min. The highest effectiveness was displayed by the 1TESNi coating, obtaining degradation of 92.56% after 240 min. Also, the photocatalytic efficiency of the 1TESNi coating was only reduced 1.99% after 3 reuse cycles in the BAM degradation. The scavenger tests revealed that the main oxidizing species involved in the reaction were the •OH and •O radicals. The 1TESNi coating showed the highest photocatalytic efficiency because of its absorption in the visible-light region, valuable surface area and electronic charge separation. Thus, these advantageous features guarantee that NiTiO coatings are an efficient method for degrading recalcitrant herbicides from drinking water using a practical way to recover and reuse photocatalysts.
在本研究工作中，通过旋涂法将 NiTiO 纳米粒子固定在玻璃板上，对难降解除草剂 2,6-二氯苯甲酰胺（BAM）的光催化性能进行了评价。用于合成 NiTiO 纳米粒子的 Ni 浓度分别为 1wt%（1TESNi）和 2wt%（2TESNi）。通过多次洗涤和热处理评估了涂层的稳定性，并通过 UV-vis 分析进行了验证。采用扫描电子显微镜（SEM-EDS）研究了涂层的形貌。TiO 和 1TESNi 的涂层厚度值分别为 1.35 和 2.56μm。采用 X 射线衍射（XRD）分析了涂层的晶体相，证实了 NiTiO 和其他与 TiO 相关的相的存在。与裸 TiO 相比，1TESNi 的带隙从 2.96 降低到 2.40eV，这是由于 Ni 的添加。TiO、1TESNi 和 2TESNi 涂层在可见光下用于 BAM 的光降解 240 分钟。1TESNi 涂层显示出最高的有效性，在 240 分钟后获得了 92.56%的降解。此外，在 BAM 降解的 3 次重复使用循环中，1TESNi 涂层的光催化效率仅降低了 1.99%。猝灭实验表明，反应中涉及的主要氧化物种是•OH 和•O 自由基。1TESNi 涂层具有较高的光催化效率，这是由于其在可见光区域的吸收、有价值的比表面积和电子电荷分离。因此，这些有利的特征保证了 NiTiO 涂层是一种从饮用水中降解难降解除草剂的有效方法，采用一种实用的方法来回收和再利用光催化剂。
