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基于MnFeO@ZnO的磁性光催化剂纳米复合材料用于偶氮染料降解

Magnetic Photocatalyst Nanocomposite Based on MnFeO@ZnO for AZO Dye Degradation.

作者信息

Lopez Medina Javier Alonso, Domínguez David, Pizá Pedro, Liu Guoduan, Velez Camilo, Reyes Gómez Faustino, Farías Mario Humberto, Caudillo-Flores Uriel, Soto Herrera Gerardo, Tiznado Hugo, Mejía-Salazar Jorge Ricardo

机构信息

SECIHTI - IxM - Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, B.C. C.P. 22800, México.

Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, B.C. C.P. 22800, México.

出版信息

ACS Omega. 2025 Apr 26;10(17):17595-17610. doi: 10.1021/acsomega.4c11468. eCollection 2025 May 6.

DOI:10.1021/acsomega.4c11468
PMID:40352532
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12059902/
Abstract

This work focuses on fabricating a photocatalyst nanocomposite based on MnFeO@ZnO for degrading Red Amaranth azo dye. Manganese ferrite (MnFeO) magnetic nanoparticles were synthesized via a hydrothermal method, while a ZnO thin film, acting as the photoactive layer, was deposited on the magnetic cores using the atomic layer deposition (ALD) technique. X-ray diffraction (XRD) confirmed the spinel ferrite structure of MnFeO and the hexagonal wurtzite phase of ZnO. The crystallite size, determined from the (311) peak, was 36.5 nm; this value was consistent with the average size of 33.2 nm measured by transmission electron microscopy (TEM). Magnetic characterization via vibrating sample magnetometry (VSM) at room temperature revealed a superparamagnetic behavior, determined by a very small hysteresis loop. The ZnO coating, achieved with 200 ALD cycles, resulted in a degradation efficiency η of approximately 60% for the Red Amaranth dye. Finite-difference time-domain (FDTD) simulations provided theoretical insights into the electromagnetic interactions driving the photodegradation process, supporting the UV-vis absorbance data of the AZO dye. This nanocomposite can be considered as a soft magnetic material that offers promising applications in nanotechnology for environmentally friendly wastewater treatment and remediation.

摘要

这项工作聚焦于制备一种基于MnFeO@ZnO的光催化剂纳米复合材料，用于降解苋菜红偶氮染料。通过水热法合成了锰铁氧体（MnFeO）磁性纳米颗粒，而作为光活性层的ZnO薄膜则使用原子层沉积（ALD）技术沉积在磁芯上。X射线衍射（XRD）证实了MnFeO的尖晶石铁氧体结构和ZnO的六方纤锌矿相。由（311）峰确定的微晶尺寸为36.5 nm；该值与通过透射电子显微镜（TEM）测量的33.2 nm平均尺寸一致。通过室温下的振动样品磁强计（VSM）进行的磁性表征显示出超顺磁性行为，这由非常小的磁滞回线确定。通过200次ALD循环实现的ZnO涂层对苋菜红染料的降解效率η约为60%。时域有限差分（FDTD）模拟为驱动光降解过程的电磁相互作用提供了理论见解，支持了偶氮染料的紫外-可见吸收数据。这种纳米复合材料可被视为一种软磁材料，在纳米技术中为环境友好型废水处理和修复提供了有前景的应用。

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