Preparation and photocatalytic application of AgBr modified Bi 2 WO 6 nanosheets with high adsorption capacity
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ARTICLE Preparation and photocatalytic application of AgBr modified Bi2WO6 nanosheets with high adsorption capacity Peng Zhang College of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China; and Helmholtz-Zentrum Berlin for Materials and Energy, Institute of Applied Materials, Berlin 14109, Germany
Zhiyuan Dong, Yuanming Ran, and Hualin Xiea) College of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China
Yun Lu College of Mechanical Engineering & Graduate School, Chiba University, Chiba 263-8522, Japan
Shimin Ding Collaborative Innovation Center for Green Development in Wuling Mountain Areas, Yangtze Normal University, Chongqing 408100, China (Received 25 August 2018; accepted 25 September 2018)
AgBr-modified Bi2WO6 nanosheets were successfully synthesized using a CTAB-assisted hydrothermal method followed by a facile deposition–precipitation procedure. The as-prepared photocatalysts were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (DRS), Brunauer–Emmett–Teller (BET), and photoluminescence emission spectroscopy (PL). AgBr nanoparticles were found evenly distributed on the surface of the Bi2WO6 nanosheets. The AgBr/Bi2WO6 nanocomposite demonstrated enhanced pollutant decolorization efficiency in eliminating Rhodamine B (RhB), methyl orange (MO), and phenol aqueous solutions under simulated solar light irradiation. It has been noticed that the adsorption performance of both Bi2WO6 nanosheets and AgBr-modified Bi2WO6 nanosheets played a more important role in the decolorization of pollutants, such as RhB and MO, than their photocatalytic ability. The high adsorption efficiency of the photocatalysts was mainly attributed to the increased surface area and the exposed reactive facets of the materials.
I. INTRODUCTION
Bismuth tungstate (Bi2WO6) has received growing attention in recent years due to its excellent photocatalytic performance under visible-light irradiation.1,2 It has a narrow band gap of about 2.70–2.85 eV and presented photoabsorption properties from the UV light region to visible light shorter than 470 nm.1–3 Bi2WO6 is usually reported to be synthesized via the hydrothermal method. Different morphologies such as flower microspheres and spherical and lamellar structures have been obtained by many authors.1,4–6 Of these, lamellar structure Bi2WO6 or Bi2WO6 nanosheets are relevant because they exhibit higher activity than their counterpart with hierarchical nanosheet-based microspheres, probably due to its high specific surface area and particular exposed reactive facets.7–10 However, the photocatalytic performance of pure Bi2WO6 is still not satisfactory due to its low quantum efficiency and the fast charge recombination of a single photocatalyst semiconductor. a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2018.386 J. Mater. Res., Vol. 33, No. 23, Dec 14, 2018
Silver bromide (AgBr)
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