Synergistic photocatalytic and Fenton-like degradation of MO by nanocatalyst La0.7Sr0.3Mn0.85Fe0.15O3
In this paper, a series of samples La 0.7 Sr 0.3 Mn 1-x Fe x O 3 ( x = 0, 0.05, 0.10, 0.15, 0.2) were prepared. Among these samples, La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 showed better catalytic activity than the samples with undoped and other doped ones, so undoped iron La 0.7 Sr 0.3 MnO 3 and doped iron La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 were characterized by X-ray diffraction (XRD), UV–Vis diffuse reflection analysis (UV–Vis DRS), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), scanning electron microscope (SEM), specific surface analysis (BET), and X-ray photoelectron spectroscopy (XPS). In addition, it takes methyl orange (MO) as the object of degradation, and the photocatalysis, Fenton-like reaction, and their synergistic catalytic effects as well as the catalytic mechanisms of La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 have been studied. The results show that La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 exhibits high solar-driven photocatalytic and Fenton-like catalytic activities for MO degradation. Moreover, there is an obvious synergistic catalytic effect of photocatalysis and Fenton-like catalytic activity. In addition, according to the free radical capture experiment, the hole, •OH and •O 2 − are the active substances in the synergistic catalytic process. The possible synergistic catalytic mechanism of La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 was also proposed. And the average pore size of the catalyst is 20.91 nm by BET. The near-superparamagnetic properties of La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 enable it to achieve simple separation in an external magnetic field, avoiding the disadvantages of ordinary catalysts that are difficult to separate. Therefore, La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 is an advanced multifunctional nanocatalyst and could be widely used in the field of wastewater treatment. Graphical abstract The magnetic La0.7Sr0.3Mn0.85Fe0.15O3 was synthesized by hydrothermal method successfully, the photocatalysis, Fenton-like reaction and their synergistic catalytic effects as well as the catalytic mechanisms of La0.7Sr0.3Mn0.85Fe0.15O3 have been studied, It is not only a high efficient solar-driven photocatalyst, but also has Fenton -like catalytic properties, and both of them have synergistic catalytic effect. And those indicate that La0.7Sr0.3Mn0.85Fe0.15O3 is an advanced multi-functional catalyst.
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