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A Novel Delafossite Structured Visible-Light Sensitive AgFeO2 Photocatalyst: Preparation, Photocatalytic Properties, and Reaction Mechanism

Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
Author to whom correspondence should be addressed.
Academic Editor: Dionysios (Dion) Demetriou Dionysiou
Catalysts 2016, 6(5), 69;
Received: 23 February 2016 / Revised: 29 April 2016 / Accepted: 4 May 2016 / Published: 10 May 2016
(This article belongs to the Special Issue Photocatalytic Wastewater Treatment)
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This work presents a systematic study of a novel efficient visible-light sensitive AgFeO2 photocatalyst. The photocatalysts were prepared via simple hydrothermal procedure at 160 °C with different reaction time. The structures, morphologies, specific surface areas, and optical properties of the photocatalysts were explored by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller (BET) model, and UV-vis diffuse reflectance spectra (DRS). Photoluminescence and photocurrent analysis were conducted for the understanding of photogenerated electron-hole pair separation. AgFeO2 with a six-hour hydrothermal procedure demonstrated the most efficient photocatalytic performance which resulted in 97% degradation of methyl orange (MO) within 180 min. The enhanced photocatalytic activity was attributed to the combined effect of its relatively large surface area and high separation electron-hole pair efficiency. Holes and ·O2 were the dominant reactive species responsible for MO degradation and holes played the leading role according to the quenching effects analysis and detection of active species. The conduction and valence band position of AgFeO2 were calculated to be −0.5 V and 1.32 V, respectively. Based on active species detection, along with the band structure, the photocatalytic mechanism was proposed. View Full-Text
Keywords: photocatalyst; AgFeO2; delafossite; visible light; hydrothermal photocatalyst; AgFeO2; delafossite; visible light; hydrothermal

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Yin, L.; Shi, Y.; Lu, L.; Fang, R.; Wan, X.; Shi, H. A Novel Delafossite Structured Visible-Light Sensitive AgFeO2 Photocatalyst: Preparation, Photocatalytic Properties, and Reaction Mechanism. Catalysts 2016, 6, 69.

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