Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 280, Issue -, Pages 713-722Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.08.055
Keywords
Z-scheme photocatalyst; Bi2O3/g-C3N4; Preparation; Characterization; Mechanism
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Funding
- Natural Science Foundation of China (NSFC) [20973071, 51172086, 51272081, 21103060]
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A direct Z-scheme photocatalyst Bi2O3/g-C3N4 was prepared by ball milling and heat treatment methods. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV-vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface areas, photoluminescence technique (PL), and electron spin resonance (ESR) technology. The photocatalytic activity was evaluated by degradation of methylene blue (MB) and rhodamine B (RhB). The results showed that Bi2O3/g-C3N4 exhibited a much higher photocatalytic activity than pure g-C3N4 under visible light illumination. The rate constants of MB and RhB degradation for Bi2O3(1.0 wt.%)/g-C3N4 are about 3.4 and 5 times that of pure g-C3N4, respectively. The migration of photogenerated carriers adopts a Z-scheme mechanism. The photoexcited electrons in the CB of Bi2O3 and photogenerated holes in the VB of g-C3N4 are quickly combined, so the photoexcited electrons in the CB of g-C3N4 and holes in the VB of Bi2O3 participate in reduction and oxidation reactions, respectively. O-center dot(2)-, (OH)-O-center dot and h(+) are the major reactive species for the Bi2O3/g-C3N4 photocatalytic system. (C) 2014 Elsevier B.V. All rights reserved.
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