新型磁性可分离 CoFe2O4/Mn3O4 纳米复合材料的可见 LED 光驱动光催化活性

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects Pub Date : 2024-09-25 DOI:10.1016/j.nanoso.2024.101351

Vidit Pandey , Sandeep Munjal , Tufail Ahmad

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引用次数: 0

摘要

采用溶胶-凝胶和水热法成功合成了一种新型磁性可分离 CoFe2O4/Mn3O4 半导体催化剂。利用 X 射线衍射、扫描电子显微镜、透射电子显微镜、拉曼和傅立叶变换红外光谱仪对制备的样品进行了表征。Mn3O4 和 CoFe2O4 分别呈四方和立方相。所获得的样品直接光带隙属于可见光区。这些催化剂被用于在 LED 可见光下光降解亚甲基蓝（MB）染料。CoFe2O4 与 Mn3O4 的耦合形成了 II 型异质结，提高了光催化效率，提供了磁分离特性，并防止了电荷载流子的重组。合成的 CoFe2O4/Mn3O4 纳米复合材料具有优异的光催化活性，其速率常数高达 ∼ 0.03889 minute-1。清除试验表明，空穴和超氧自由基是降解染料的主要反应物。纳米复合材料的磁性可分离特性有助于从降解的甲基溴染料溶液中回收催化剂，用于下一次光降解循环。

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Visible LED-light driven photocatalytic activity by a novel magnetically separable CoFe2O4/Mn3O4 nanocomposite

A novel magnetic separable CoFe₂O₄/Mn₃O₄ semiconductor catalyst was synthesized by sol-gel-cum-hydrothermal method, successfully. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman, and Fourier transformed infra-red spectrometers were used to characterize the prepared samples. Mn₃O₄ and CoFe₂O₄ exhibit in tetragonal and cubic phases, respectively. The obtained direct optical band gap of the samples belongs to the visible region. These catalysts were employed in photo-degradation of methylene blue (MB) dye under an LED visible light. Coupling of CoFe₂O₄ with Mn₃O₄, which formed type-II heterojunction, enhances the photocatalytic efficiency, provides magnetic separable features, and prevents the charge carriers’ recombination. Synthesized CoFe₂O₄/Mn₃O₄ nanocomposites show excellent photocatalytic activity with a high value of rate constant ∼ 0.03889 minute⁻¹. The scavenging test reveals that the holes and superoxide radicals were dominant reactive species in the degradation of dye. Magnetic separable feature of nanocomposite helps to recover the catalysts from degraded MB dye solution for the next photo-degradation cycles.

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来源期刊

Nano-Structures & Nano-Objects Physics and Astronomy-Condensed Matter Physics

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

22 days

期刊介绍： Nano-Structures & Nano-Objects is a new journal devoted to all aspects of the synthesis and the properties of this new flourishing domain. The journal is devoted to novel architectures at the nano-level with an emphasis on new synthesis and characterization methods. The journal is focused on the objects rather than on their applications. However, the research for new applications of original nano-structures & nano-objects in various fields such as nano-electronics, energy conversion, catalysis, drug delivery and nano-medicine is also welcome. The scope of Nano-Structures & Nano-Objects involves: -Metal and alloy nanoparticles with complex nanostructures such as shape control, core-shell and dumbells -Oxide nanoparticles and nanostructures, with complex oxide/metal, oxide/surface and oxide /organic interfaces -Inorganic semi-conducting nanoparticles (quantum dots) with an emphasis on new phases, structures, shapes and complexity -Nanostructures involving molecular inorganic species such as nanoparticles of coordination compounds, molecular magnets, spin transition nanoparticles etc. or organic nano-objects, in particular for molecular electronics -Nanostructured materials such as nano-MOFs and nano-zeolites -Hetero-junctions between molecules and nano-objects, between different nano-objects & nanostructures or between nano-objects & nanostructures and surfaces -Methods of characterization specific of the nano size or adapted for the nano size such as X-ray and neutron scattering, light scattering, NMR, Raman, Plasmonics, near field microscopies, various TEM and SEM techniques, magnetic studies, etc .