CNT/Ag₃PO₄ composites with highly enhanced visible light photocatalytic activity and stability

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• 作者：Hui Xu ; Cheng Wang ; Yanhua Song ; Jiaxiang Zhu ; Yuanguo Xu ; Jia Yan ; Yongxiu Song ; Huaming Li
• 关键词：CNT/Ag3PO4 ; Photocatalytic ; Heterojunction
• 刊名：Chemical Engineering Journal
• 出版年：1 April, 2014
• 年：2014
• 卷：241
• 期：Complete
• 页码：35-42
• 全文大小：1297 K

文摘

A novel CNT/Ag₃PO₄ composite was synthesized by a two-step method. The physical and chemical properties of catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy dispersive spectrometer (EDS), transmission electron microscope (TEM), diffuse-reflection spectra (DRS) and photocurrent techniques. The XRD, EDS, TEM and XPS analyses indicated that the heterojunction structure had formed in the composite. The DRS analysis showed that the addition of CNT had promoted the optical absorption of Ag₃PO₄ in the visible region, which meant that it could absorb and use more light energy to enhance the photocatalytic activity. The photocatalytic performance of the samples was evaluated by photocatalytic oxidation of Rhodamine B (RhB) dye under visible light irradiation. The results showed that CNT/Ag₃PO₄ exhibited much higher photocatalytic activity than the pure Ag₃PO₄. It was interesting that CNT/Ag₃PO₄ (0.1 wt%) exhibited the highest photocatalytic degradation efficiency. Moreover, CNT/Ag₃PO₄ (0.1 wt%) exhibited a higher photocurrent than that of Ag₃PO₄, which was for the reason that CNT could lead to good electron transfer between the materials. The mechanism of the CNT/Ag₃PO₄ composite with enhancing heterojunction photocatalytic activity was researched.