The ternary Ag/La-TiO_2−x heterojunctions were prepared successfully and was used for the photocatalytic degradation of tetracycline (TC) under visible light irradiation. Using numerous techniques, the factors affecting the structure, morphology and optoelectronic properties of Ag/La-TiO_2−x composites were systematically discussed. Due to the higher photoinduced charge separation efficiency, the as-prepared composites possessed the excellent visible-light photocatalytic degradation activity of TC. The ·O₂^- was the primary active species as well as the h⁺ and •OH were the essential active species during the process of photocatalytic degradation. Moreover, the mechanism of photocatalytic degradation of TC by Ag/La-TiO_2−x composites was given, and the degradation pathways of TC during the process of photocatalytic were also considered. Based on the synergism of the introduction of Ti³⁺ and O_v, the inhibition charges recombination caused of La and the SPR effect of Ag nanoparticles, the photocatalytic performance of the Ag/La-TiO_2−x composite observably improved. Due to the excellent photocatalytic properties and stability, the Ag/La-TiO_2−x hybrid composites are expected to have significant potential applications in energy conversion and environmental remediation.

成功制备了三元Ag/La-TiO _2-x异质结，并用于在可见光照射下光催化降解四环素（TC）。使用多种技术，系统地讨论了影响Ag/La-TiO _2-x复合材料的结构、形貌和光电性能的因素。由于较高的光致电荷分离效率，所制备的复合材料具有优异的可见光光催化降解 TC 的活性。在光催化降解过程中，·O ₂ ^-是主要的活性物质，而h ⁺和·OH 是必不可少的活性物质。此外，Ag/La-TiO2光催化降解TC的机理_给出了2-x复合材料，并考虑了TC在光催化过程中的降解途径。基于Ti ³⁺和O _v的引入、La引起的抑制电荷复合和Ag纳米颗粒的SPR效应的协同作用，Ag/La-TiO _2-x复合材料的光催化性能得到显着提高。由于优异的光催化性能和稳定性，Ag/La-TiO _2-x杂化复合材料有望在能量转换和环境修复方面具有重要的潜在应用。