TiO₂ nanostructures have been one of the most explored metal oxides photocatalysts to apply for environmental remediation. However, its wide band gap results in the underutilization of sunlight for degradation of pollutants. In order to overcome this handicap, the synthesis of TiO₂-based composite has brought extraordinary materials. In this study, we design and prepare TiO₂/Nb₂O₅ heterostructures with different molar ratios by using peroxotitanium and peroxoniobium complex as precursors in aqueous solution. The TiO₂ exists in the form of anatase while Nb₂O₅ is amorphous in the composite, leading to a special crystalline TiO₂/amorphous Nb₂O₅ heterostructures. In particular, Nb element is also doped and Ti³⁺ ions are formed in the TiO₂ lattice, leading to a reduced band gap. The unique TiO₂/0.25Nb₂O₅ (Ti:Nb = 2:1) heterostructures can effectively suppress the recombination of photogenerated electrons and holes, and facilitate the charge transfer, resulting in the optimum photocatalytic performance. The nitrogen oxide removal efficiency by TiO₂/0.25Nb₂O₅ is 77.23% in visible light, which is 3.8-folds and 7.0-folds higher than pure TiO₂ and Nb₂O_5. Photocatalytic degradation of acetaminophen by TiO₂/0.25Nb₂O₅ is 90.6% in visible light, which is approximately 2.5-folds higher than pure TiO₂ and Nb₂O₅.

TiO ₂纳米结构已成为探索最多的用于环境修复的金属氧化物光催化剂之一。然而，它的宽带隙导致在降解污染物方面没有充分利用阳光。为了克服这一障碍，TiO ₂基复合材料的合成带来了非凡的材料。在本研究中，我们通过使用过氧钛和过氧铌配合物作为水溶液的前驱体，设计并制备了具有不同摩尔比的TiO ₂ /Nb ₂ O ₅异质结构。TiO ₂以锐钛矿的形式存在，而复合材料中的Nb ₂ O ₅是无定形的，导致特殊的结晶 TiO₂ /非晶Nb ₂ O ₅异质结构。特别是，Nb 元素也被掺杂并且 Ti ³⁺离子在 TiO ₂晶格中形成，导致带隙减小。独特的TiO ₂ /0.25Nb ₂ O ₅ (Ti:Nb = 2:1)异质结构可以有效抑制光生电子和空穴的复合，促进电荷转移，从而获得最佳的光催化性能。可见光下TiO ₂ /0.25Nb ₂ O ₅的氮氧化物去除效率为77.23%，是纯TiO ₂和Nb _{2 的}3.8倍和7.0倍O _5. TiO ₂ /0.25Nb ₂ O ₅在可见光下对乙酰氨基酚的光催化降解率为90.6%，比纯TiO ₂和Nb ₂ O ₅高约2.5倍。