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The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
Published on: July 4, 2017
[Preparation of Ag-AgI/CN/MA Composites and Their Visible-light Photocatalytic Performance]
Sai Zhang1,2, Li-Li Zhang1, Chun Hu1,2
1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Abstract:
Ag-AgI/CN/MA photocatalysts were prepared by coupling graphitic carbon nitride (CN) with AgI/γ-Al2O3(AgI/MA) through a thermal polymerization method and Ag nanoparticles were deposited by photoreduction. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), UV-vis diffuse reflectance spectra (UV-vis DRS), and transmission electron microscopy (TEM). The photocatalytic performance of different catalysts was evaluated under visible light irradiation (λ>420 nm). The effects of different conditions such as pH and catalyst dosage on photoreactions were also investigated. The results showed that Ag+ and Ag0 coexisted on the surface of the catalyst and Ag and AgI nanoparticles were uniformly distributed on the surface of CN. Compared with CN and Ag-AgI/MA, Ag-AgI/CN/MA composites exhibited better visible-light photocatalytic activity and stability, and the release of silver ions was significantly suppressed. At the catalyst dosage of 1 g·L-1 and pH=7, Ag-AgI/CN/MA-2 exhibited the optimal photocatalytic performance. Ag-AgI/CN/MA-2 also showed high photoactivity for the degradation of dyes with different charges, such as rhodamine B (RhB), methyl red (MR) and congo red (CR).
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