Ag-decorated 3D flower-like Bi 2 MoO 6 /rGO with boosted photocatalytic performance for removal of organic pollutants
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Ag-decorated 3D flower-like Bi2MoO6/rGO with boosted photocatalytic performance for removal of organic pollutants Xin Liu, Wei-Ya Huang* , Qin Zhou, Xi-Rong Chen, Kai Yang, Dan Li, Dionysios D. Dionysiou*
Received: 24 January 2020 / Revised: 30 April 2020 / Accepted: 13 August 2020 The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A series of unique 3D flower-like Bi2MoO6 (BMO)/reduced graphene oxide (rGO) heterostructured composites decorated with varying amounts of Ag nanoparticles (NPs) were fabricated. Their morphological characteristics, structural features, energy band structures and photoelectrochemical properties were systematically studied. All the Ag/BMO/rGO ternary composites (AgBGy; y = 1%, 2% and 3%) demonstrated greater photocatalytic activity towards efficient removal of our selected organic models [methyl orange (MO), rhodamine B (RhB) and phenol], as compared with the BMO/rGO binary composites (BG-x; x = 0.25, 2, 4 and 5). Particularly, AgBG-2%, which was synthesized with the addition of 2 wt% rGO and 2 wt% Ag in BMO, possessed superior photocatalytic activity. The fitted rate constants (k) for the photocatalytic degradation of RhB, MO and phenol using AgBG-2% were estimated to be 0.0286, 0.0301 and 0.0165 min-1, respectively, which were over one order of magnitude greater than those obtained using pure BMO. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12598-020-01574-3) contains supplementary material, which is available to authorized users. X. Liu, W.-Y. Huang*, Q. Zhou, X.-R. Chen, K. Yang Faculty of Materials, Metallurgical and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China e-mail: [email protected] W.-Y. Huang, D. D. Dionysiou* Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221-0012, USA e-mail: [email protected] D. Li College of Science, Health, Engineering and Education, Murdoch University, Murdoch 6150, Australia
Several factors may contribute to the observed enhancement, including greater specific surface area, enhanced light absorption, promoted spatial separation of electron– hole (e-–h?) pairs and their suppressed recombination, especially benefiting from the synergistic effects among BMO, rGO and Ag NPs. Our work suggests that the rational design of BMO/rGO/Ag ternary composite was an effective strategy to boost the photocatalytic activity of the resulting catalyst towards the highly efficient removal of organic pollutants from water. Keywords Bi2MoO6; Reduced graphene oxide; Ag nanoparticles; 3D flower-like morphology; Photocatalytic degradation
1 Introduction The discharge of wastewater containing synthetic organic pollutants into the natural water bodies has posed a huge threat to water environment and even human health. Semiconductor photocatalysis is regarded as a promising way to efficiently treat va
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