研究目的
Investigating the doping effects on mixed-phase crystalline perovskite AxSr1?xFeO3?δ (A = Pr, Sm; 0 ≤ x ≤ 0.8) nanoparticles and their application for photodegradation of rhodamine B.
研究成果
The Pr and Sm dopants play a crucial role in the structural features and enhanced photocatalytic activity of SrFeO3?δ. The crystal with mixed phases during the phase transitions created self-formed heterostructures and exhibited better photocatalytic degradation of RhB under visible light irradiation than single phase. The highest photocatalytic activity was obtained for Sm0.8Sr0.2FeO3?δ catalyst, on which more than 88% of RhB was degraded after only 60 min.
研究不足
The study focuses on the photocatalytic degradation of RhB under UV and visible light irradiation, and the effects of Pr and Sm doping on the photocatalytic activity of SrFeO3?δ. The limitations include the specific conditions under which the experiments were conducted, such as the calcination temperature and the mole ratio of A-site doping.
1：Experimental Design and Method Selection:
The study synthesized perovskite AxSr1?xFeO3?δ nanoparticles using a solution combustion method. The effect of calcination temperatures and A-site doping on crystal structure properties was studied.
2：Sample Selection and Data Sources:
Pr(NO3)3·6H2O, Sm(NO3)3·6H2O, Sr(NO3)2·6H2O, and Fe(NO3)3·9H2O were used as precursors.
3：List of Experimental Equipment and Materials:
X-ray diffractometer (Holland PANalytical X’pert Pro MRD), scanning electron microscopy (SEM) using a Hitachi S-4800, UV–Vis spectrophotometer (Hitachi UV-3900, Japan), and a Micrometrics ASAP 2020 HD88 system for BET surface area measurement.
4：Experimental Procedures and Operational Workflow:
The precursors were dissolved and mixed, followed by heating and stirring to form a gel-like matter, which was then calcined at different temperatures.
5：Data Analysis Methods:
XRD analysis, SEM and TEM analysis, BET analysis, and UV–Vis diffuse reflectance spectra were used to characterize the samples.
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