Comparison of photocatalytic activity and stability of AgBr/Ag/Ag2CO3-mordenite and AgX (X= Cl, I)/Ag/Ag2CO3- mordenite

چکیده مقاله

In this work, AgX (X=Cl, Br, I)/Ag/Ag2CO3 photocatalysts have been successfully synthesized via a facile precipitation method on mordenite (MOR) support. AgX with different weight percentage (20%, 40%, 50% and 60%) were coupled into Ag2CO3. The different amounts of support was investigated. The obtained hybrids were characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The DRS results demonstrate plasmonic resonance band of silver NPs in 400-600 region. The following, photocatalytic activity for degradation of methylene blue (MB) was examined by photocatalysts under visible light irradiation. The evaluation of the photocatalytic activity indicates that AgX (X= Br, I)/Ag/Ag2CO3-MOR exhibits higher photocatalytic degradation efficiency for degradation of MB under visible light irradiation than AgCl/Ag2CO3-MOR, Ag2CO3-MOR and Ag2CO3. The recycling tests indicates that the stability of AgBr/Ag/Ag2CO3-MOR is higher than the AgI/Ag/Ag2CO3-MOR. The cycle experiments show after the formation of heterojunction between AgBr and Ag2CO3, the stability of the catalyst improved significantly, the photocatalytic activity of the catalyst after 4 recycling runs is changed slightly, suggesting that the AgBr/Ag/Ag2CO3 photocatalyst hybrid has high stability

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