In this work, mesoporous Gd₂O₃-TiO₂ nanocomposites synthetized by a sol–gel with vary Gd₂O₃ concentration were investigated for photo-destruction of imazapyr herbicide waste. Textural, structural and surface properties of the synthetized nanocomposites are verified by N₂ physisorption, X-ray diffractometry, HRTEM and various spectroscopic techniques (FTIR, DRS UV–Vis, Raman, PL and XPS). HRTEM micrographs of the calcined Gd₂O₃-TiO₂ revealed the existence of a mesoporous matrix consisting of homogeneously distributed TiO₂ nanoparticles (NPs, 12 nm) which are decorated with Ga₂O₃ nanoparticles. It was found a reverse correlation between the amount of Gd₂O₃ concentration and the TiO₂ nanoparticle size: the formation of smaller TiO₂ nanoparticles was favored by the use of high Gd₂O₃ concentration. The photocatalytic efficiency of the synthetized Gd₂O₃-TiO₂ nanocomposites was appraised in the photo-destruction of imazapyr herbicide below visible-light irradiation. The best herbicide destruction was achieved using 3%Gd₂O₃-TiO₂ photocatalyst and degraded the imazapyr herbicide 20.5 and 8.2 times faster than a commercial P25 and non-promoted TiO₂, respectively, indicating that modification of TiO₂ with Gd₂O₃ led to a significant improvement of photocatalyst efficiency. This was explained as due to a lessening of the apparent optical bandgap and the formation of a large amount of surface defect states favoring the separation between electrons and holes. Besides its high efficiency, the 3%Gd₂O₃-TiO₂ photocatalyst demonstrated to be recyclable and stable in the visible-light-driven photocatalytic destruction of imazapyr herbicide.

在这项工作中，研究了 由溶胶-凝胶合成的中孔Gd ₂ O ₃ -TiO ₂纳米复合材料，其中溶胶-凝胶具有不同的Gd ₂ O ₃浓度，用于光降解吡虫啉除草剂废物。合成的纳米复合材料的质地，结构和表面性质已通过N ₂物理吸附，X射线衍射，HRTEM和各种光谱技术（FTIR，DRS UV-Vis，Raman，PL和XPS）进行了验证。煅烧后的Gd ₂ O ₃ -TiO _2的HRTEM显微照片显示，存在介孔基体，该基体由均匀分布的TiO ₂纳米颗粒（NP，12 nm）组成，并用Ga装饰₂ O ₃纳米粒子。发现Gd ₂ O ₃浓度的量与TiO ₂纳米颗粒尺寸之间存在反相关关系：使用高Gd ₂ O ₃浓度有利于形成较小的TiO ₂纳米颗粒。 在可见光下，对吡虫啉除草剂的光解性能进行了评价，评价了合成的Gd ₂ O ₃ -TiO ₂纳米复合材料的光催化效率。使用3％Gd ₂ O ₃ -TiO ₂可以达到最佳的除草剂销毁效果 光催化和降解吡虫啉除草剂的速度分别比市售P25和未促进的TiO ₂快20.5和8.2倍，表明用Gd ₂ O ₃改性TiO ₂导致光催化效率的显着提高。这被解释为是由于表观光学带隙的减小和大量表面缺陷状态的形成，有利于电子和空穴之间的分离。3％Gd ₂ O ₃ -TiO ₂光催化剂除具有很高的效率外，在可见光驱动下对吡虫啉除草剂的光催化破坏中具有可回收利用和稳定的作用。