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
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
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.