In situ facile fabrication of Z-scheme leaf-like β-Bi2O3/g-C3N4 nanosheets composites with enhanced visible light photoactivity
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In this work, leaf-like β-Bi2O3/g-C3N4 nanosheets composites were synthesized via a simple in situ method. β-Bi2O3/g-C3N4 nanocomposites were obtained via calcining the mixtures of g-C3N4 and metallic Bi, while, at the same temperature, in the absence of g-C3N4, metallic Bi formed α-Bi2O3. The presence of β-Bi2O3 in the composite was demonstrated by X-ray diffraction, high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy analysis. From scanning electron microscope analysis, the morphology of leaf-like β-Bi2O3 and the g-C3N4 nanosheets were observed. The as-prepared β-Bi2O3/g-C3N4 composite exhibited higher photocatalytic activity than both pure β-Bi2O3 and g-C3N4 for photocatalytic degradation of methylene blue under visible light. The active species capture experiments and photoluminescence experiments illustrated that the degradation mechanism followed the Z-scheme mechanism. This proposed method provides an efficiency way to prepare potential visible light responsive materials for wastewater treatment.
This work was supported by the National Natural Science Foundation of China (Nos. 21277108; 21476179), the Fundamental Research Funds for the Central Universities, China (WUT: 185208007), one hundred talents project of Guangzhou University and 2016 Wuhan Yellow Crane Talents (Science) Program.
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