CoFe2O4/CdS纳米复合物的制备、表征及其声催化降解有机染料污染物

doi:10.1016/S1872-2067(16)62473-7

摘要/Abstract

摘要：

在低温（200℃）下采用一步水热分解CoFe₂O₄纳米粒子表面的镉二硫代氨基甲酸酯配合物制备了磁性CoFe₂O₄/CdS纳米复合物，运用X射线衍射、红外光谱、扫描电镜、X射线能量散射谱、紫外-可见光谱、透射电镜（TEM）、N₂吸附-脱附、X射线光电子能谱和振动样品磁强计对所制样品进行了表征.TEM结果表明，CoFe₂O₄/CdS纳米复合物由几乎均一的约20nm球形纳米粒子组成.光吸收谱显示该样品的带隙为2.24 eV，很适合用于声/光催化降解有机污染物.在紫外光照射下评价了CoFe₂O₄/CdS纳米复合物的声催化H₂O₂辅助降解甲基蓝、罗丹明B和甲基橙反应活性.结果表明，该纳米复合物对这3种染料均表现出很好的声催化活性（5-9 min内完全降解）.另外，比较实验结果表明，CoFe₂O₄/CdS纳米复合物是一个比纯CdS更高效的声催化剂.因此，纳米复合是一种非常好的提高CdS声催化活性的手段.该CoFe₂O₄/CdS纳米复合物表现出的磁性使其很容易从反应混合物中分离出来而重复使用.

关键词: CoFe₂O₄/CdS纳米复合物, 镉二硫代氨基甲酸酯, 水热分解, 声催化剂, 染料降解

Abstract:

A magnetic CoFe₂O₄/CdS nanocomposite was prepared via one-step hydrothermal decomposition of cadmium diethanoldithiocarbamate complex on the surface of CoFe₂O₄ nanoparticles at a low temperature of 200℃. The nanocomposite was characterised by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy, energy-dispersive X-ray spectroscopy(EDX), UV-visible spectroscopy, transmission electron microscopy(TEM), N₂ gas sorption analysis, X-ray photoelectron spectroscopy(XPS), and vibrating sample magnetometry. The FT-IR, XRD, EDX and XPS results confirmed the formation of the CoFe₂O₄/CdS nanocomposite. Based on the TEM analysis, the CoFe₂O₄/CdS nanocomposite constituted nearly uniform, sphere-like nanoparticles of ~20 nm in size. The optical absorption spectrum of the CoFe₂O₄/CdS nanocomposite displayed a band gap of 2.21 eV, which made it a suitable candidate for application in sono/photocatalytic degradation of organic pollutants. Accordingly, the sonocatalytic activity of the CoFe₂O₄/CdS nanocomposite was evaluated towards the H₂O₂-assisted degradation of methylene blue, rhodamine B, and methyl orange under ultrasonic irradiation. The nanocomposite displayed excellent sonocatalytic activity towards the degradation of all dyes examined-the dyes were completely decomposed within 5-9 min. Furthermore, a comparison study revealed that the CoFe₂O₄/CdS nanocomposite is a more efficient sonocatalyst than pure CdS; thus, adopting the nanocomposite approach is an excellent means to improve the sonoactivity of CdS. Moreover, the magnetic properties displayed by the CoFe₂O₄/CdS nanocomposite allow easy retrieval of the catalyst from the reaction mixture for subsequent uses.

Key words: CoFe₂O₄/CdS nanocomposite, Cadmium dithiocarbamate, Hydrothermal decomposition, Sonocatalyst, Dye degradation

Saeed Farhadi, Firouzeh Siadatnasab. CoFe₂O₄/CdS纳米复合物的制备、表征及其声催化降解有机染料污染物[J]. 催化学报, 2016, 37(9): 1487-1495.

Saeed Farhadi, Firouzeh Siadatnasab. CoFe₂O₄/CdS nanocomposite: Preparation, characterisation, and application in sonocatalytic degradation of organic dye pollutants[J]. Chinese Journal of Catalysis, 2016, 37(9): 1487-1495.

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CoFe₂O₄/CdS纳米复合物的制备、表征及其声催化降解有机染料污染物

CoFe₂O₄/CdS nanocomposite: Preparation, characterisation, and application in sonocatalytic degradation of organic dye pollutants

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