Background: Removal of the organic pollutants using the photo-catalysts by the photocatalytic treatment process under natural sunlight irradiation has attracted great attention owing to the complete destruction of the organic pollutants. The La bismuthate nanorods possess good photocatalytic performance for the removal of the methylene orange (MO) under the sunlight irradiation.

Objective: The aim is to synthesize La bismuthate nanorods by hydrothermal method and research the photocatalytic performance of the La bismuthate nanorods for MO degradation under sunlight irradiation.

Methods: La bismuthate nanorods have been synthesized by a simple sodium dodecyl benzene sulfonate (SDBS)-assisted hydrothermal method using sodium bismuthate and La acetate as the starting materials. The obtained La bismuthate products were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy and solid UV-vis diffuse reflectance spectrum.

Results: With different SDBS concentration, hydrothermal temperature and reaction time, different morphologies of the La bismuthate products were obtained. XRD analysis shows that the La bismuthate nanorods obtained from 180°C for 24 h with 5wt.% SDBS are composed of orthorhombic La1.08Bi0.92O3.03 phase. Electron microscopy observations show that the La bismuthate nanorods with flat tips have the length of longer than 10 μm and diameter of about 20-100 nm, respectively. The morphology and structure of the products are closely related to the SDBS concentration, hydrothermal temperature and reaction time. Solid UV-vis diffuse reflectance spectrum shows that the band gap of the La bismuthate nanorods is 2.37 eV. The La bismuthate nanorods show good photocatalytic performance for the degradation of MO under the sunlight irradiation. MO solution with the concentration of 10 mg.L-1 can be totally removed by 10 mg La bismuthate nanorods in 10 mL MO aqueous solution under sunlight irradiation for 6 h.

Conclusion: The photocatalytic performance for the removal of MO is dependent on the sunlight irradiation time and dosage of the La bismuthate nanorods. The La bismuthate nanorods exhibit great potential for the removal of organic pollutants.

背景：在自然阳光照射下，采用光催化剂通过光催化处理工艺去除有机污染物引起了人们的广泛关注。铋铋酸盐纳米棒在阳光照射下具有良好的光催化性能，可去除亚甲基橙（MO）。

目的：目的是通过水热法合成铋铋酸盐纳米棒，研究铋铋酸盐纳米棒在阳光照射下对MO降解的光催化性能。

方法：以铋酸钠和乙酸镧为起始原料，通过简单的十二烷基苯磺酸钠（SDBS）辅助水热法合成铋铋酸盐纳米棒。通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜和固体UV-vis漫反射光谱研究所得的铋铋酸盐产物。

结果：在不同的SDBS浓度，水热温度和反应时间的情况下，获得了铋酸铋产物的不同形态。X射线衍射分析表明，在180℃下干燥24h，含5wt。％的SDBS的铋铋酸盐纳米棒由正交晶La1.08Bi0.92O3.03相组成。电子显微镜观察表明，具有扁平尖端的铋铋酸盐纳米棒的长度分别大于10μm，直径约为20-100 nm。产物的形态和结构与SDBS浓度，水热温度和反应时间密切相关。固体紫外可见漫反射光谱表明，铋铋酸盐纳米棒的带隙为2.37 eV。铋铋酸盐纳米棒对日光照射下的MO降解具有良好的光催化性能。

结论：去除MO的光催化性能取决于阳光照射时间和铋铋酸盐纳米棒的用量。铋铋酸盐纳米棒具有去除有机污染物的巨大潜力。