Plasma modification of the structural, morphological, and catalytic activity of Fe3O4@SiO2@TiO2 core–shell system

IF 23.2 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Amr Gangan, Alaa Fahmy, Seham A. Shaban, Zeinhom M. El-Bahy
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引用次数: 0

Abstract

Pulsed DC plasma-liquid interaction was used to prepare Ag-doped Fe3O4@SiO2@TiO2 (PP-FST) core–shell in a very short time compared to conventional methods. Tetraethyl orthosilicate (TEOS) and Ti(IV) isopropoxide precursors were employed as sources of SiO2 and TiO2, respectively, under the influence of plasma-liquid interaction using silver metal electrodes. TEM images and EDS mapping proved the successful formation of Fe3O4@SiO2@TiO2 core–shell structure without the detection of Ag NPs on the PP-FST surface. This proposed the dispersion of Ag NPs within TiO2 lattice during the synthesis process using the plasma-liquid technique. The XRD patterns show an increase of the crystallinity of the sample after exposure to plasma. Furthermore, structural and optical properties were studied using XPS and UV–Vis, respectively. The synthesized FST core–shell exhibited outstanding light absorption capabilities which may be attributed to the strong surface plasmon resonance (SPR) effect at the interface of the Ag nanoparticles and the TiO2 semiconductor. This interaction lowers the energy band gap of PP-FST to 2.05 eV, compared to 2.73 eV for FST. The specific surface area determined by BET analysis was 53.9 m2/g for PP-FST, whereas it was 34.1 m2/g for FST. Moreover, the activity of both the plasma-prepared and conventionally synthesized FST core–shell nano-catalysts was evaluated for the removing of toxic dyes such as Acid Orange 142 (AO). The degradation efficiency significantly increased to 99.6% for PP-FST compared to 80% for FST, highlighting the effect of plasma treatment.

等离子体修饰Fe3O4@SiO2@TiO2核壳体系的结构、形态和催化活性
与传统方法相比,利用脉冲直流等离子体-液体相互作用在很短的时间内制备了ag掺杂Fe3O4@SiO2@TiO2 (PP-FST)核壳。正硅酸四乙酯(TEOS)和钛(IV)异丙醇前驱体分别作为SiO2和TiO2的来源,在等离子体-液体相互作用的影响下,使用银金属电极。TEM图像和EDS图谱证实,在PP-FST表面没有检测到Ag NPs的情况下,Fe3O4@SiO2@TiO2核壳结构成功形成。这提出了在等离子体-液体技术合成过程中Ag NPs在TiO2晶格内的分散。XRD分析表明,等离子体处理后样品的结晶度有所提高。利用XPS和UV-Vis分别对其结构和光学性质进行了研究。合成的FST核壳具有出色的光吸收能力,这可能是由于银纳米粒子与TiO2半导体界面处存在较强的表面等离子体共振(SPR)效应。这种相互作用将PP-FST的能带隙降低到2.05 eV,而FST的能带隙为2.73 eV。BET分析法测定的PP-FST比表面积为53.9 m2/g,而FST为34.1 m2/g。此外,还对等离子体制备和常规合成的FST核壳纳米催化剂去除酸性橙142 (AO)等有毒染料的活性进行了评价。与FST的80%相比,PP-FST的降解效率显著提高到99.6%,突出了等离子体处理的效果。
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来源期刊
CiteScore
26.00
自引率
21.40%
发文量
185
期刊介绍: Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.
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