NDLI: Mediator-free direct Z-scheme photocatalytic system: $BiVO_{4}/g-C_{3}N_{4}$ organic–inorganic hybrid photocatalyst with highly efficient visible-light-induced photocatalytic activity

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tian, Na Guo, Yuxi Zhang, Tierui Zhang, Yihe He, Ying Huang, Hongwei
Description	Author Affiliation: Tian N ( Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China. hhw@cugb.edu.cn zyh@cugb.edu.cn.)
Abstract	We disclose the fabrication of a mediator-free direct Z-scheme photocatalyst system $BiVO_{4}/g-C_{3}N_{4}$ using a mixed-calcination method based on the more reliable interfacial interaction. The facet coupling occurred between the $g-C_{3}N_{4}$ (002) and $BiVO_{4}$ (121), and it was revealed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM). The crystal structure and optical properties of the as-prepared samples have also been characterized by Fourier-transform infrared (FTIR), scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectra (DRS) in details. The photocatalytic experiments indicated that the $BiVO_{4}/g-C_{3}N_{4}$ composite photocatalysts display a significantly enhanced photocatalytic activity pertaining to RhB degradation and photocurrent generation (PC) compared to the pristine $BiVO_{4}$ and $g-C_{3}N_{4}.$ This remarkably improved photocatalytic performance should be attributed to the fabrication of a direct Z-scheme system of $BiVO_{4}/g-C_{3}N_{4},$ which can result in a more efficient separation of photoinduced charge carriers than band–band transfer, thus endowing it with the much more powerful oxidation and reduction capability, as confirmed by the photoluminescence (PL) spectra and electrochemical impedance spectra (EIS). The Z-scheme mechanism of $BiVO_{4}/g-C_{3}N_{4}$ heterostructure was verified by a series of combined techniques, including the active species trapping experiments, NBT transformation and terephthalic acid photoluminescence probing technique (TA-PL) over $BiVO_{4}/g-C_{3}N_{4}$ composites and the pristine samples. The present work not only furthered the understanding of mediator-free Z-scheme photocatalysis, but also shed new light on the design of heterostructural photocatalysts with high-performance.
ISSN	14779226
Issue Number	9
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-03-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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