Abstract
In this article, undoped and Mn-doped ZnS (Mn x Zn1−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−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−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−x S NPs, due to Mn2+ incorporation. The present study leads to enhance the photocatalytic activity of Mn x Zn1−x S NPs, and TiO2 catalyst was added. As expected, Mn x Zn1−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−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.
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Manimegalai, D.K., Manikandan, A., Moortheswaran, S. et al. Magneto-Optical and Photocatalytic Properties of Magnetically Recyclable Mn x Zn1−x S(x = 0.0, 0.3, and 0.5) Nanocatalysts. J Supercond Nov Magn 28, 2755–2766 (2015). https://doi.org/10.1007/s10948-015-3089-3
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DOI: https://doi.org/10.1007/s10948-015-3089-3