LaMnO₃ nanoparticles were synthesized by citric acid complex sol-gel method and used to degrade rhodamine B (RhB) in water. The effects of initial pH value, LaMnO₃ dosage, RhB concentration and disrupter agents on the degradation of RhB were investigated. We found that LaMnO₃ exhibits an excellent degradation ability of RhB in high acidic conditions without additional oxidants or light irradiation and can achieve 99.7% degradation efficiency for RhB and 65.8% for total organic carbon. This result showed that LaMnO₃ itself provides an effective oxidative system to degrade RhB. Furthermore, a reasonable degradation pathway of RhB was proposed, including N-de-ethylation, chromophore cleavage, opening-ring, and mineralization. Finally, LaMnO₃ samples before and after the reaction were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. It is found that LaMnO₃ can maintain perovskite structure in the degradation of RhB. Mn ions in LaMnO₃ provides active center and plays a role of electron transfer during RhB degradation.

LaMnO ₃纳米颗粒通过柠檬酸复合溶胶-凝胶法合成，用于降解水中的若丹明B（RhB）。研究了初始pH值，LaMnO ₃用量，RhB浓度和破坏剂对RhB降解的影响。我们发现，LaMnO ₃在高酸性条件下显示出出色的RhB降解能力，而无需添加氧化剂或光照射，并且可以达到99.7％的RhB降解效率和65.8％的总有机碳降解率。该结果表明LaMnO ₃本身提供了有效的氧化系统来降解RhB。此外，提出了合理的RhB降解途径，包括N-去乙基化，发色团裂解，开环和矿化。最后，通过X射线衍射和X射线光电子能谱表征反应前后的LaMnO ₃样品。发现LaMnO ₃在RhB的降解中可以保持钙钛矿结构。LaMnO _3中的Mn离子提供活性中心，并在RhB降解过程中起到电子转移的作用。