Citation: LIU Jian-Xin, WANG Yun-Fang, WANG Ya-Wen, FAN Cai-Mei. Synthesis, Regeneration and Photocatalytic Activity under Visible-Light Irradiation of Ag/Ag₃PO₄/g-C₃N₄ Hybrid Photocatalysts[J]. Acta Physico-Chimica Sinica, ;2014, 30(4): 729-737. doi: 10.3866/PKU.WHXB201402243 shu

Synthesis, Regeneration and Photocatalytic Activity under Visible-Light Irradiation of Ag/Ag₃PO₄/g-C₃N₄ Hybrid Photocatalysts

1.
Institute of Clean Technique for Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China

Received Date: 9 December 2013
Available Online: 24 February 2014
Fund Project:

Ag/Ag₃PO₄/g-C₃N₄ (g denotes graphitic) was synthesized via an anion-exchange precipitation method, and its photocatalytic activity under visible light and regeneration with H₂O₂ and NaNH₄HPO₄ were investigated. The structural characteristics were analyzed using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-Vis) absorption spectroscopy, and X-ray photoelectron spectroscopy (XPS). The XRD results showed that the structure of the regenerated catalyst was unchanged. The FESEM and UV-Vis absorption spectroscopy results showed that the Ag/Ag₃PO₄/g-C₃N₄ catalyst was composed of Ag₃PO₄ and g-C₃N₄. XPS showed that a small amount of Ag particles were present on the catalyst surface. The photocatalytic activity was evaluated using phenol degradation under visible light (λ>420 nm) and the photocatalytic mechanism was discussed based on the active species during the photocatalytic process and the band structure. Experimental studies showed that the photocatalytic activity of the as-prepared Ag/Ag₃PO₄/g-C₃N₄ was higher than those of pure Ag₃PO₄ and g-C₃N₄. The high photocatalytic performance of the Ag/Ag₃PO₄/g-C₃N₄ composite can be attributed to the synergistic effect of Ag₃PO₄, g-C₃N₄, and a small amount of Ag⁰. Regeneration using H₂O₂ and NaNH₄HPO₄? 4H₂O fully restored the photoactivity of the catalyst, showing that this green regeneration method could make Ag/Ag₃PO₄/g-C₃N₄ an environmentally friendly catalyst for practical applications.
- Silver phosphate,
- g-C₃N₄,
- Metallic silver,
- Catalyst regeneration,
- Phenol,
- Photocatalysis
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis, Regeneration and Photocatalytic Activity under Visible-Light Irradiation of Ag/Ag3PO4/g-C3N4 Hybrid Photocatalysts

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通讯作者: 陈斌, bchen63@163.com

Synthesis, Regeneration and Photocatalytic Activity under Visible-Light Irradiation of Ag/Ag₃PO₄/g-C₃N₄ Hybrid Photocatalysts