Transformation from Ag@Ag₃PO₄ to Ag@Ag₂SO₄ hybrid at room temperature: preparation and its visible light photocatalytic activity

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• 作者：Ting Wei ; Shanmin Gao ; Qingyao Wang ; Hui Xu ; Zeyan Wang&#8230
• 关键词：Ag/Ag2SO4 ; Ag@Ag3PO4 ; Redox ; precipitation ; reaction ; Visible light photocatalytic ; Surface plasmon resonance ; Degradation of pollutants
• 刊名：Journal of Nanoparticle Research
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：19
• 期：2
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Nanotechnology; Inorganic Chemistry; Characterization and Evaluation of Materials; Physical Chemistry; Optics, Lasers, Photonics, Optical Devices;
• 出版者：Springer Netherlands
• ISSN：1572-896X
• 卷排序：19

文摘

In the present study, Ag/Ag₂SO₄ hybrid photocatalysts were obtained via a facile redox–precipitation reaction approach by using Ag@Ag₃PO₄ nanocomposite as the precursor and KMnO₄ as the oxidant. Multiple techniques, such as X-ray diffraction pattern (XRD), transmission electron microscope (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS) and Brunauer–Emmett–Teller (BET), photocurrent and electrochemical impedance spectroscopy (EIS), were applied to investigate the structures, morphologies, optical, and electronic properties of as-prepared samples. The photocatalytic activities were evaluated by photodegradation of organic rhodamine B (RhB) and methyl orange (MO) under visible light irradiation. It was found that pure Ag₂SO₄ can partially transform into metallic Ag during the photocatalytic degradation of organic pollutants, but the Ag/Ag₂SO₄ hybrids can maintain its structure stability and show enhanced visible light photocatalytic activity because of the surface plasma resonance effect of the metallic Ag.