Three-Dimensional Porous Aerogel Constructed by g-C3N4 and Graphene Oxide Nanosheets with Excellent Visible-Light Photocatalytic Performance

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• 作者：Zhenwei Tong ; Dong Yang ; Jiafu Shi ; Yanhu Nan ; Yuanyuan Sun ; Zhongyi Jiang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：7
• 期：46
• 页码：25693-25701
• 全文大小：634K
• ISSN：1944-8252

文摘

It is curial to develop a high-efficient, low-cost visible-light responsive photocatalyst for the application in solar energy conversion and environment remediation. Here, a three-dimensional (3D) porous g-C₃N₄/graphene oxide aerogel (CNGA) has been prepared by the hydrothermal coassembly of two-dimensional g-C₃N₄ and graphene oxide (GO) nanosheets, in which g-C₃N₄ acts as an efficient photocatalyst, and GO supports the 3D framework and promotes the electron transfer simultaneously. In CNGA, the highly interconnected porous network renders numerous pathways for rapid mass transport, strong adsorption and multireflection of incident light; meanwhile, the large planar interface between g-C₃N₄ and GO nanosheets increases the active site and electron transfer rate. Consequently, the methyl orange removal ratio over the CNGA photocatalyst reaches up to 92% within 4 h, which is much higher than that of pure g-C₃N₄ (12%), 2D hybrid counterpart (30%) and most of representative g-C₃N₄-based photocatalysts. In addition, the dye is mostly decomposed into CO₂ under natural sunlight irradiation, and the catalyst can also be easily recycled from solution. Significantly, when utilized for CO₂ photoreduction, the optimized CNGA sample could reduce CO₂ into CO with a high yield of 23 mmol g^鈥? (within 6 h), exhibiting about 2.3-fold increment compared to pure g-C₃N₄. The photocatalyst exploited in this study may become an attractive material in many environmental and energy related applications.