Synergistic photocatalytic and Fenton-like degradation of MO by nanocatalyst La0.7Sr0.3Mn0.85Fe0.15O3,Journal of Nanoparticle Research

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Synergistic photocatalytic and Fenton-like degradation of MO by nanocatalyst La0.7Sr0.3Mn0.85Fe0.15O3
Journal of Nanoparticle Research ( IF 2.1 ) Pub Date : 2021-09-17 , DOI: 10.1007/s11051-021-05325-y
Shujia Zhou ₁ , Chengrong Yan ₁ , Yunfei Dang ₁ , Xuefang Cao ₁ , Zhixian Wei ₁

Affiliation

In this paper, a series of samples La_0.7Sr_0.3Mn_1-xFe_xO₃ (x = 0, 0.05, 0.10, 0.15, 0.2) were prepared. Among these samples, La_0.7Sr_0.3Mn_0.85Fe_0.15O₃ showed better catalytic activity than the samples with undoped and other doped ones, so undoped iron La_0.7Sr_0.3MnO₃ and doped iron La_0.7Sr_0.3Mn_0.85Fe_0.15O₃ 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_0.7Sr_0.3Mn_0.85Fe_0.15O₃ have been studied. The results show that La_0.7Sr_0.3Mn_0.85Fe_0.15O₃ 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 •O₂⁻ are the active substances in the synergistic catalytic process. The possible synergistic catalytic mechanism of La_0.7Sr_0.3Mn_0.85Fe_0.15O₃ was also proposed. And the average pore size of the catalyst is 20.91 nm by BET. The near-superparamagnetic properties of La_0.7Sr_0.3Mn_0.85Fe_0.15O₃ enable it to achieve simple separation in an external magnetic field, avoiding the disadvantages of ordinary catalysts that are difficult to separate. Therefore, La_0.7Sr_0.3Mn_0.85Fe_0.15O₃ 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.

中文翻译：

纳米催化剂La0.7Sr0.3Mn0.85Fe0.15O3协同光催化和类芬顿降解MO

本文制备了一系列样品 La _0.7 Sr _0.3 Mn _1-x Fe _x O ₃ ( x = 0, 0.05, 0.10, 0.15, 0.2)。在这些样品中，La _0.7 Sr _0.3 Mn _0.85 Fe _0.15 O ₃比未掺杂和其他掺杂的样品表现出更好的催化活性，因此未掺杂的铁La _0.7 Sr _0.3 MnO ₃和掺杂的铁La _0.7 Sr _0.3 Mn _0.85 Fe ₃_0.15 O ₃通过 X 射线衍射 (XRD)、紫外-可见漫反射分析 (UV-Vis DRS)、振动样品磁强计 (VSM)、透射电子显微镜 (TEM)、扫描电子显微镜 (SEM)、比表面分析 (BET) 进行表征) 和 X 射线光电子能谱 (XPS)。此外，它需要甲基橙（MO）作为降解的对象，和光催化，类Fenton反应，和它们的协同催化效果以及La中的催化机制_0.7锶_0.3锰_0.85铁_0.15 ö ₃已经研究. 结果表明，La _0.7 Sr _0.3 Mn _0.85 Fe _0.15 O ₃表现出高太阳能驱动的光催化和类芬顿催化活性，用于 MO 降解。此外，光催化和类芬顿催化活性具有明显的协同催化作用。此外，根据自由基捕获实验，空穴、•OH和•O ₂^-是协同催化过程中的活性物质。还提出了La _0.7 Sr _0.3 Mn _0.85 Fe _0.15 O ₃可能的协同催化机理。BET测得催化剂的平均孔径为20.91 nm。La _0.7 Sr _0.3 Mn _0.85 Fe _0.15的近超顺磁性O ₃使其能够在外磁场中实现简单的分离，避免了普通催化剂难以分离的缺点。因此，La _0.7 Sr _0.3 Mn _0.85 Fe _0.15 O ₃是一种先进的多功能纳米催化剂，可广泛应用于废水处理领域。

图形概要

水热法成功合成了磁性La0.7Sr0.3Mn0.85Fe0.15O3，研究了光催化、类芬顿反应及其协同催化作用以及La0.7Sr0.3Mn0.85Fe0.15O3的催化机理，它不仅是一种高效的太阳能驱动光催化剂，而且具有类芬顿催化性能，两者具有协同催化作用。表明La0.7Sr0.3Mn0.85Fe0.15O3是一种先进的多功能催化剂。

更新日期：2021-09-17

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