Facile assembly of BiVO 4 /protonated g-C 3 N 4 /AgI with a novel dual Z-scheme mechanism for visible-light photocatalyt
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Facile assembly of BiVO4/protonated g-C3N4/AgI with a novel dual Z-scheme mechanism for visible-light photocatalytic degradation of Rhodamine B Min Xu1, Jingkai Yang1,2,*, Chaoyang Sun1, Yan Cui1, Lu Liu1, Hongli Zhao1, and Bo Liang1,* 1
State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China 2 Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province, Yanshan University, Qinhuangdao 066004, China
Received: 26 June 2020
ABSTRACT
Accepted: 8 September 2020
Constructing Z-scheme photocatalyst is an effective strategy to achieve efficient photogenerated electron-holes separation and retain its outstanding redox ability simultaneously. In this work, a novel ternary BiVO4/protonated g-C3N4/ AgI photocatalyst with a double Z-scheme mechanism is successfully constructed by electrostatic self-assembly method loading of BiVO4 onto protonated g-C3N4 and subsequently via an in situ precipitation route. Using Rhodamine B (RhB) as the target of elimination, BiVO4/protonated g-C3N4/AgI displays excellent photocatalytic performance with the 94.67% removal after 60-min visible light irradiation. The photodegradation rate constant of RhB is 0.04963 min-1, which faster than pristine BiVO4 (0.0004 min-1), BiVO4/protonated g-C3N4 (0.0209 min-1) and BiVO4/AgI (0.0317 min-1), respectively. Such enhancement in photocatalytic activity is correlated to improved light absorption, faster charge carrier separation and transportation as well as more powerful redox ability originating from the formation of double Z-scheme heterostructure. Also, the as-prepared ternary sample exhibits high stability after four cycles of the photodegradation reaction. Furthermore, the possible photocatalytic mechanism of BiVO4/protonated g-C3N4/AgI is also proposed. Therefore, we believe that this work can provide insights into the understanding the significant role of design and synthesis the double Z-scheme in semiconductor heterostructure system for environmental remediation.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Pedro Camargo.
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https://doi.org/10.1007/s10853-020-05315-w
J Mater Sci
Introduction Photocatalytic technology, which is regarded as an effective and eco-friendly pathway due to the environmental protection and solar energy conversion with using utilization of solar energy [1, 2]. In the heterogeneous photocatalytic oxidation process, photogenerated electron-holes, during the irradiation of a semiconductor by UV or visible photons, react with dissolved oxygen and H2O/OH– to yield superoxide and hydroxyl radicals, respectively. These radicals and photogenerated electron-holes can destroy the organic molecules and disintegrate them into CO2 and H2O [3]. As visible-light photocatalysts, monoclinic scheelite structure BiVO4 is considered as a promising photocatalyst for water
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