Z-scheme mechanism of photogenerated carriers for hybrid photocatalyst Ag₃PO₄/g-C₃N₄ in degradation of sulfamethoxazole

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• 作者：Li Zhou^a ; ^b ; Wei Zhang^b ; Ling Chen^b ; Huiping Deng^b ; ^{94124558@qq.com" class="auth_mail" title="E-mail the corresponding author} ; ^{joly.zhouli@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Silver phosphate ; g-C3N4 ; Ag ; Stability ; Photocatalytic mechanism
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：487
• 期：Complete
• 页码：410-417
• 全文大小：1137 K

文摘

Composite or hybrid photocatalysts are gaining increasing interests due to the unique and enhanced photocatalytic activity. In this study, Ag₃PO₄/g-C₃N₄ with different ratios of Ag₃PO₄ and g-C₃N₄ were synthesized using a facile in situ precipitation method. The photocatalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction pattern (XRD), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS). The photocatalytic performance was evaluated by the degradation of sulfamethoxazole (SMX), a model antibiotic compound, under visible light irradiation. It was found that the composite photocatalyst Ag₃PO₄/g-C₃N₄ with a mass ratio of Ag₃PO₄:g-C₃N₄ of 98:2 exhibited a higher photocatalytic activity than Ag₃PO₄/g-C₃N₄ with the mass ratio of 2:98 for the degradation of SMX. When Ag₃PO₄ was the primary part of Ag₃PO₄/g-C₃N₄ photocatalyst, the migration of photogenerated electron-hole showed a Z-scheme mechanism with photongenerated holes on the valance band of Ag₃PO₄ to oxidize pollutants. The separation mechanism was investigated by the photoluminescence technique and the scavengering of reactive oxygen species.