New Application of Z-Scheme Ag3PO4/g-C3N4 Composite in Converting CO2 to Fuel

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• 作者：Yiming He ; Lihong Zhang ; Botao Teng ; Maohong Fan
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：January 6, 2015
• 年：2015
• 卷：49
• 期：1
• 页码：649-656
• 全文大小：447K
• ISSN：1520-5851

文摘

This research was designed for the first time to investigate the activities of photocatalytic composite, Ag₃PO₄/g-C₃N₄, in converting CO₂ to fuels under simulated sunlight irradiation. The composite was synthesized using a simple in situ deposition method and characterized by various techniques including Brunauer鈥揈mmett鈥揟eller method (BET), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV鈥搗is diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and an electrochemical method. Thorough investigation indicated that the composite consisted of Ag₃PO₄, Ag, and g-C₃N₄. The introduction of Ag₃PO₄ on g-C₃N₄ promoted its light absorption performance. However, more significant was the formation of heterojunction structure between Ag₃PO₄ and g-C₃N₄, which efficiently promoted the separation of electron鈥揾ole pairs by a Z-scheme mechanism and ultimately enhanced the photocatalytic CO₂ reduction performance of the Ag₃PO₄/g-C₃N₄. The optimal Ag₃PO₄/g-C₃N₄ photocatalyst showed a CO₂ conversion rate of 57.5 渭mol路h^鈥?路g_cat^鈥?, which was 6.1 and 10.4 times higher than those of g-C₃N₄ and P25, respectively, under simulated sunlight irradiation. The work found a new application of the photocatalyst, Ag₃PO₄/g-C₃N₄, in simultaneous environmental protection and energy production.