Novel Bi/BiOBr/AgBr composite microspheres: Ion exchange synthesis and photocatalytic performance |
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| Institution: | 1. College of Chemical Engineering, North China University of Science and Technology, Tangshan, 063210, China;2. Hebei Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment, Tangshan, 063210, China;1. School of Material Science and Engineering, University of Jinan, Jinan, Shandong, 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Jinan, Shandong 250022, China;1. College of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, Zigong 643000, PR China;2. Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;1. Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, Guangdong, China;2. Synergy Innovation Institute of GDUT, Shantou 515041, Guangdong, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China;2. Engineering Technology Research Center of Henan Province for Solar Catalysis, Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China;3. ESIQIE, Instituto Politecino Nacional, col Zacatenco, Mexico City 07738, Mexico |
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| Abstract: | Novel Bi/BiOBr/AgBr composite microspheres were prepared by a rational in situ ion exchange reaction between Bi/BiOBr microspheres and AgNO3. The characteristic of the as-obtained ternary microspheres was tested by X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (UV–vis DRS) and photoluminescence (PL). Under visible light irradiation, Bi/BiOBr/AgBr microspheres exhibited an excellent photocatalytic efficiency for rhodamine B (RhB) degradation, which was about 1.4 and 4.9 times as high as that of Bi/BiOBr and BiOBr/AgBr, demonstrating that the highest separation efficiency of charge carriers in the heterostructured Bi/BiOBr/AgBr. The photocatalytic activity of Bi/BiOBr/AgBr microspheres just exhibited a slight decrease after three consecutive cycles. The photocatalytic mechanism investigation confirmed that the superoxide radicals (O2??) were the dominant reactive oxygen species for RhB degradation in Bi/BiOBr/AgBr suspension. |
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| Keywords: | Bi/BiOBr/AgBr microspheres Ion exchange Photocatalysis Visible light Mechanism |
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