Photocatalytic activity of green synthesized canted ferromagnetic hematite iron oxide nanoparticles for methyl orange removal in wastewater remediation

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-14 DOI:10.1016/j.jmmm.2025.173182

Biplab Kumar Mandal , Pratap Singh Chauhan , Rahul Das

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引用次数: 0

Abstract

In this study, iron oxide nanoparticles (NPs) were synthesized in an environmentally friendly manner utilizing FeCl₃ as the precursor salt in the presence of Nyctanthes arbor-tristis L. leaf extract. The sizes of these NPs were estimated using electron microscopy to be between 18 nm and 66 nm. The images of high-resolution transmission electron microscopy (HRTEM) were used to calculate the crystallographic interplanar spacing (d_hkl). The Rietveld refinement of XRD data indicates that synthesized iron oxide nanoparticles belong to the pure hematite (α-Fe₂O₃) rhombohedral lattice symmetry of the

R \bar{3}

c (167) space group with lattice constants of a = b = 0.49 nm and c = 1.35 nm. Crystallites in this sample have an average size of 40.31 nm. The 2-D and 3-D electron density (ED) maps provided detailed information regarding the distribution of ions. According to magnetic measurements, the produced α-Fe₂O₃ NPs were determined to be canted ferromagnetic with a room temperature coercive force of 129.87 × 10^-4 T and a Morin temperature of 201 K. UV–Vis analysis provided an overall assessment of the band gap (E_g). The photocatalytic activity of these n-type semiconducting (having direct E_g = 2.43 eV and indirect E_g = 1.87 eV) canted ferromagnetic α-Fe₂O₃ NPs was examined for the degradation of methyl orange (MO) dyes. The results demonstrated substantial catalytic activity towards MO degradation in the presence of a small amount of H₂O₂, suggesting their potential application in wastewater treatment.

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绿色合成倾斜铁磁赤铁矿氧化铁纳米颗粒在废水修复中去除甲基橙的光催化活性

本研究以三氯化铁为前体盐，在夜草叶提取物的存在下，以环境友好的方式合成了氧化铁纳米颗粒（NPs）。用电子显微镜估计这些NPs的大小在18 nm到66 nm之间。利用高分辨率透射电镜（HRTEM）图像计算晶体面间距（dhkl）。XRD数据的Rietveld细化表明，合成的氧化铁纳米颗粒属于R3¯c（167）空间群的纯赤铁矿（α-Fe2O3）菱形晶格对称，晶格常数分别为a = b = 0.49 nm和c = 1.35 nm。样品中晶体的平均尺寸为40.31 nm。二维和三维电子密度（ED）图提供了有关离子分布的详细信息。通过对α-Fe2O3纳米粒子的磁性测试，确定了α-Fe2O3纳米粒子为倾斜铁磁性，其室温矫顽力为129.87 × 10-4 T， Morin温度为201 K。UV-Vis分析提供了带隙（Eg）的总体评估。研究了n型半导体（直接Eg = 2.43 eV和间接Eg = 1.87 eV）倾斜α-Fe2O3纳米粒子对甲基橙（MO）染料的光催化活性。结果表明，在少量H2O2存在下，对MO降解具有显著的催化活性，表明其在废水处理中的潜在应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.