Citation: LIU Chun-Mei, ZHANG Guo-Ying, ZHANG Xin, XU Yan-Yan, GAO Dong-Zhao. Hydrothermal Synthesis of Ag₃PO₄ Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity[J]. Acta Physico-Chimica Sinica, ;2015, 31(10): 1939-1948. doi: 10.3866/PKU.WHXB201508251 shu

Hydrothermal Synthesis of Ag₃PO₄ Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity

1.
Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Ministry of Education, College of Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China

Received Date: 6 July 2015
Available Online: 25 August 2015
Fund Project: 国家自然科学基金(21303122) (21303122)天津市高等学校创新团队培养计划(TD12-5038)资助项目 (TD12-5038)

Ag₃PO₄ polyhedrons were synthesized by a facile hydrothermal route using polyethylene glycol-6000 (PEG-6000). The effects of hydrothermal temperature, reaction time, and PEG-6000 dosage on the morphologies and structures of the products were systematically investigated. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS), and photoluminescence (PL) spectra. The hydrothermal temperature and the PEG dosage are key factors in the production of Ag₃PO₄ polyhedrons with oriented {110} facets. The Ag₃PO₄ polyhedrons evolve via Ostwald ripening, and exhibit superior visible-light photocatalytic degradation of Rhodamine B (RhB) relative to Ag₃PO₄ samples without oriented {110} facets and Ag₃PO₄ nanoparticles prepared by anion-exchange. The reaction rate constant of the Ag₃PO₄ polyhedrons was 8.3 times that of the Ag₃PO₄ nanoparticles. Total organic carbon (TOC) analysis and cycling experiments revealed that the polyhedrons have better mineralization efficiency and exhibit od circulation runs. Holes (h+) and hydroxyl radicals (·OH) are confirmed to be the dominant active species in the presence of radical scavengers and in N₂-saturated solution. Given the redox potential of the active species and the band structure of Ag₃PO₄ polyhedron, the separation and migration mechanism of photogenerated electron-hole (e^--h⁺) pairs at the photocatalytic interface was proposed.
- Silver phosphate,
- PEG-6000,
- Hydrothermal route,
- Photocatalysis,
- Active species,
- Separation of photogenerated carriers
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Hydrothermal Synthesis of Ag3PO4 Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity

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通讯作者: 陈斌, bchen63@163.com

Hydrothermal Synthesis of Ag₃PO₄ Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity