Preparation of Ag-TiO₂@MnO₂ and Degradation of Toxic Organic Pollutants under Visible Light Irradiation

Abstract:

Ag-TiO2@MnO2 nanoparticles prepared by two-step hydrothermal method were characterized by X-ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM), Brunauer-Emmett- Teller (BET) and UV-Visible diffuse reflectance spectra (UV-Vis DRS). The degradation of rhodamine B (RhB) and 2, 4-dichlorophenol (2, 4-DCP) under visible light (λ≥420 nm) were used as probe reactions to investigate the photocatalytic activity of Ag-TiO2@MnO2. The results showed that the basic structure of Ag-TiO2@MnO2 was composed of TiO2 with anatase crystalline structure and α-MnO2 with cubic crysatalline structure. The optimal molar ratio nAg/nMn was 6%. Ag-TiO2@MnO2 had the highest photocatalytic activity in neutral medium because of composing and modifying of Ag. The decolorization rate of RhB reached 100% after 600 min and the mineralization rate of 2, 4-DCP was 47.0% after 30 hr. The oxidation process was dominated by the •OH generated in the system.

• Periodical: Advanced Materials Research (Volume 668)
• Pages: 379-382
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.668.379
• Online since: March 2013
• Authors: Yan Fen Fang, Jun Zi Liu, Shu Lian Wang, An Ping Deng, Ying Ping Huang
• Keywords: Ag-Doped, TiO₂@MnO₂, Visible Degradation

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