Belt-like Bi₄O₅Br₂ hierarchical nanostructures were synthesized through a facile one-step hydrolysis method performed at different temperatures (0–160 °C), using belt-like bismuth subsalicylate as the morphological template and bismuth source. The belt-like Bi₄O₅Br₂ samples are found to be composed of irregular single-crystal nanosheets with highly exposed (0 1 0) facets. The photocatalytic activity of the belt-like Bi₄O₅Br₂ was evaluated by referring to the degradation of salicylic acid and resorcinol under visible-light irradiation, and compared with those of belt-like BiOBr dominantly exposing (0 1 0) facets and plate-like Bi₄O₅Br₂ dominantly exposing (1 0 −1) facets. The belt-like Bi₄O₅Br₂ shows higher photocatalytic activity than belt-like BiOBr owing to the more negative conduction band potential, narrower band gap, and larger specific surface area (S_BET) of the former. In addition, the belt-like Bi₄O₅Br₂ also exhibits higher photocatalytic activity than plate-like Bi₄O₅Br₂, mainly due to the larger S_BET of the former. Interestingly, the belt-like Bi₄O₅Br₂ obtained at room temperature (25 °C) shows the highest photocatalytic activity, because it has the largest S_BET. Moreover, the as-synthesized belt-like Bi₄O₅Br₂ exhibits excellent stability and reusability. This study provides a simple, energy-saving route for the synthesis of belt-like bismuth-rich bismuth oxyhalide hierarchical nanostructures.

通过在不同温度（0-160°C）下采用带状亚水杨酸铋作为形态模板和铋源，通过简便的一步水解法合成带状Bi ₄ O ₅ Br ₂分层纳米结构。发现带状的Bi ₄ O ₅ Br ₂样品由不规则的单晶纳米片组成，这些纳米片具有高度暴露的（0 1 0）面。带状Bi ₄ O ₅ Br ₂的光催化活性通过观察可见光照射下水杨酸和间苯二酚的降解进行评价，并与主要暴露的带状BiOBr（0 1 0）面和主要暴露的板状Bi ₄ O ₅ Br ₂（1 0）进行比较。 -1）刻面。带状的Bi ₄ O ₅ Br ₂具有比带状的BiOBr更高的光催化活性，这是由于前者的负导带电势更大，带隙更窄，比表面积（S _BET）更大。另外，带状的Bi ₄ O ₅ Br ₂也具有比板状的Bi ₄高的光催化活性。O ₅ Br ₂，主要是由于前者的S _BET较大。有趣的是，在室温（25°C）下获得的带状Bi ₄ O ₅ Br ₂具有最高的光催化活性，因为它具有最大的S _BET。此外，刚合成的带状Bi ₄ O ₅ Br ₂表现出优异的稳定性和可重复使用性。该研究为带状富铋卤氧化铋分层纳米结构的合成提供了一条简单，节能的途径。