Magneto-Optical and Photocatalytic Properties of Magnetically Recyclable Mn x Zn1?em class="a-plus-plus">x S(x = 0.0, 0.3, and 0.5) Nanocatalysts

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• 作者：D. K. Manimegalai ; A. Manikandan…
• 关键词：ZnS nanocrystals ; Photocatalysis ; Microwave combustion ; Magnetic properties ; Optical properties
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：28
• 期：9
• 页码：2755-2766
• 全文大小：2,134 KB
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• 作者单位：D. K. Manimegalai (1)
  A. Manikandan (2)
  S. Moortheswaran (2)
  S. Arul Antony (2)
  
  1. Department of Chemistry, Bharathi Women’s College (Autonomous), Chennai, 600 108, Tamil Nadu, India
  2. Postgraduate and Research Department of Chemistry, Presidency College (Autonomous), Chennai, 600 005, Tamil Nadu, India
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

In this article, undoped and Mn-doped ZnS (Mn x Zn1?em class="EmphasisTypeItalic">x S; x = 0.0, 0.3, and 0.5) nano photocatalysts were synthesized successfully by a facile microwave combustion method. Powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray (EDX), and selected area electron diffraction (SAED) patterns revealed the presence of material in well-crystalline single phase with average crystallite size of about 12 nm and the material remained cubic over the whole Mn x Zn1?em class="EmphasisTypeItalic">x S solid solution range. Formation of ultrafine, spherical, and homogeneous dispersed nanoparticles (NPs) with size 14 nm was confirmed by high-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses. Vibrating sample magnetometer (VSM) results confirmed a weak superparamagnetic behavior of Mn x Zn1?em class="EmphasisTypeItalic">x S nanocrystals, and the values of magnetization (M s) gradually increased with increasing the concentration of Mn2+ cations, due to the higher magnetic moment of Mn2+ ions (5 μ B) replaced the nonmagnetic nature of Zn2+ ions (0 μ B) in ZnS. The band gap of the samples was increased with increasing the concentration of Mn2+ ions, due to decrease in the particle size. The room temperature photoluminescence (PL) spectra of Mn2+-doped ZnS NPs showed extra peaks in yellow–orange and red region in comparison of undoped ZnS NPs. Mn2+-induced PL spectra was suggested with the significant enhancement of the PL intensity in Mn x Zn1?em class="EmphasisTypeItalic">x S NPs, due to Mn2+ incorporation. The present study leads to enhance the photocatalytic activity of Mn x Zn1?em class="EmphasisTypeItalic">x S NPs, and TiO2 catalyst was added. As expected, Mn x Zn1?em class="EmphasisTypeItalic">x S NP-sensitized TiO2 catalyst showed enhanced photocatalytic degradation (PCD) of 4-chlorophenol (4-CP) under visible light irradiation. The alteration of Mn x Zn1?em class="EmphasisTypeItalic">x S–TiO2 nanocomposites (NCs) catalysts show higher adsorption with synergistic effect and enhanced the separation of photogenerated electron–hole pairs, important to higher PCD efficiency.