复合碳纳米管增强纳米Ag2CO3的可见光催化活性和稳定性

doi:10.3866/PKU.WHXB201409191

Abstract

Abstract:

Nano-sized Ag₂CO₃ and carbon nanotube (CNT) composites were fabricated by a facile chemical precipitation approach in N,N-dimethylformamide (DMF) solvent. The as-prepared Ag₂CO₃/CNT samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and ultra violet-visible (UV-Vis) diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange (MO) under visible light irradiation. The results showed that the nano-sizedAg₂CO₃ particles and CNTs were well combined. The Ag₂CO₃/CNT composite with CNT content of 1.5%(w) exhibited optimal photocatalytic activity under visible light. Ninetythree percent of the MO was removed by the Ag₂CO₃/CNT composite within 60 min. For the Ag₂CO₃/CNT composites, we found that the incorporation of CNT improved the structural stability of Ag₂CO₃ compared with Ag₂CO₃. After three cycles, 81% of the MO was decomposed by the Ag₂CO₃/CNT composite with CNT content of 1.5% (w), but only 59.5% of the MO could be removed by Ag₂CO₃. The improvements in the activity and stability are attributed to the conductive structure supported by CNTs, which favors electron-hole separation and the removal of photogenerated electrons from the decorated Ag₂CO₃.

Key words: Ag₂CO₃/CNT composite, Photocatalysis, Visible light, Stability

MSC2000:

O644

LIU Su-Qin, WANG Song, DAI Gao-Peng, LU Jun, LIU Ke. Enhanced Visible-Light Photocatalytic Activity and Stability of Nano-Sized Ag₂CO₃ Combined with Carbon Nanotubes[J].Acta Phys. -Chim. Sin., 2014, 30(11): 2121-2126.

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Enhanced Visible-Light Photocatalytic Activity and Stability of Nano-Sized Ag₂CO₃ Combined with Carbon Nanotubes

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Enhanced Visible-Light Photocatalytic Activity and Stability of Nano-Sized Ag2CO3 Combined with Carbon Nanotubes

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Enhanced Visible-Light Photocatalytic Activity and Stability of Nano-Sized Ag₂CO₃ Combined with Carbon Nanotubes