Basic Science Department, Marg High Institute of Engineering and Modern Technology, Cairo, Egypt.
Nanoscience Laboratory for Environmental and Bio-Medical Applications (NLEBA), Semiconductor Lab., Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, 11757, Egypt.
Environ Sci Pollut Res Int. 2023 May;30(21):61106-61122. doi: 10.1007/s11356-023-26411-9. Epub 2023 Apr 13.
The present study, LaSrMO (M = Mn-, Co-, and Fe-), perovskite, has successfully been synthesized via co-precipitation and sol-gel auto-combustion. XRD, SEM, and EDX characterized the prepared samples. XRD and SEM showed that the as-prepared LaSrMnO and LaSrCoO have multiphase. LaSrFeO, in comparison, is nanosized, has a single-phase perovskite, and has a rather homogenous particle size distribution. Additionally, EDX mapping analysis shows that all pieces are distributed uniformly. According to X-ray diffractometer results, all calcined powders contain 100% LSF, more than 15% perovskite phase of LSC, 47% LSM, and other secondary phases, such as cobalt oxide. Aِt room temperature and magnetic field of ± 20 kG, LaSrMnO exhibited weak ferromagnetic behavior in a low magnetic field, whereas diamagnetic behavior was seen in a high magnetic field. LaSrFeO samples behave as strong ferromagnetic. On the contrary, the photodegradation of LaSrMnO is 99% compared to 75% and 91% for other samples under UVC lights of wavelength = 254 nm. The degradation rate for LaSrMnO is 0.179 higher, about 3.25 and 2.23, than the other samples. A LaSrMnO nanocomposite performs as a photocatalyst to enhance the efficiency of methylene blue photodegradation. This study boosts good UVC photocatalysts with high efficiency for different kinds of dyes. Hence, the catalyst possessed high stability and efficiency for continuous wastewater treatment.
本研究采用共沉淀和溶胶-凝胶自燃烧法成功合成了 LaSrMO（M=Mn、Co 和 Fe）钙钛矿。XRD、SEM 和 EDX 对制备的样品进行了表征。XRD 和 SEM 表明，所制备的 LaSrMnO 和 LaSrCoO 具有多相结构。相比之下，LaSrFeO 为纳米级，具有单相钙钛矿结构，且颗粒尺寸分布较为均匀。此外，EDX 映射分析表明所有颗粒均均匀分布。根据 X 射线衍射仪的结果，所有煅烧粉末均包含 100% 的 LSF、15% 以上的 LSC 钙钛矿相、47% 的 LSM 以及其他二次相，如氧化钴。在室温下，磁场为±20 kG 时，LaSrMnO 在低磁场下表现出弱铁磁性，而在高磁场下表现出抗磁性。LaSrFeO 样品表现出强铁磁性。相反，在波长为 254nm 的 UVC 光下，LaSrMnO 的光降解率为 99%，而其他样品的光降解率分别为 75%和 91%。LaSrMnO 的降解速率比其他样品高 0.179，约为 3.25 和 2.23。LaSrMnO 纳米复合材料作为光催化剂，提高了亚甲基蓝光降解的效率。本研究为不同类型的染料提供了高效的 UVC 光催化剂。因此，该催化剂具有高效、高稳定性，可用于连续废水处理。
