Synthesis of flower-like AgI/Bi 5 O 7 I hybrid photocatalysts with enhanced photocatalytic activity in rhodamine B degra
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Downloaded from https://www.cambridge.org/core. Tufts Univ, on 01 Jul 2018 at 13:22:06, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/jmr.2018.201
Synthesis of flower-like AgI/Bi5O7I hybrid photocatalysts with enhanced photocatalytic activity in rhodamine B degradation Xiaole Jiang, Yueying Ma, Chunran Zhao, Yijing Chen, Min Cui, and Jingxiong Yu Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua 321004, China
Ying Wu College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
Yiming Hea) Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua 321004, China (Received 26 March 2018; accepted 30 May 2018)
Flower-like AgI/Bi5O7I hybrid photocatalysts were fabricated via a hydrothermal method and the subsequent heating process with AgI/Bi4O5I2 as the intermediate. X-ray powder diffraction, Raman, X-ray photoelectron spectroscopy, diffuse reflectance spectra, scanning electron microscopy, transmission electron microscopy, photoluminescence, and electrochemical methods were used to reveal the structure, elemental content, morphology, and charge separation capabilities of the as-prepared samples. The photocatalytic test showed that the AgI/Bi5O7I composites own much higher photoactivity than pure AgI and Bi5O7I. Based on the result of XPS analysis, the composite is believed to be the Ag/AgI/Bi5O7I system. Due to the suitable band potentials of AgI and Bi5O7I, the ternary system can form a heterojunction structure which works in a Z-scheme mechanism with Ag nanoparticles as the transfer media. The guided charge transfer in the composite prolongs the life time of charge carriers and eventually leads to the high photocatalytic activity of AgI/Bi5O7I. Additionally, the flower-like structure of the composite also contributes to the photocatalytic reaction.
I. INTRODUCTION
Currently, photocatalysis technology, which is one of the most effective ways to resolve the issues of environmental pollution and energy shortage, receives more and more attention. Titanium dioxide (TiO2) and graphitic carbon nitride (g-C3N4), as two important representative photocatalysts, attract extensive attention and display great application potentials in the photocatalytic field due to their low-toxicity, and cheap and good chemical stability.1,2 Up to now, numerous studies have been carried out to enhance their photocatalytic abilities via modification. However, there still remain quite a number of issues to be tackled, such as poor efficiency in utilization of solar energy and low photogenerated charge separation. Therefore, it is still necessary to develop an effective photocatalytic material to realize the efficient utilization of solar energy. As a novel class of photocatalysts, bismuth oxyhalides BiOX (X 5 F, Cl, Br, I) have drawn extensive attention recently due to their excellent performance in photocatalysis.3–7 Considering that the activity of a photocatalyst is closely related to t
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