Au Nanoparticles (NPs) Surface Plasmon Resonance Enhanced Photocatalytic Activities of Au/Bi2WO6 Heterogeneous Nanostructures

doi:10.15541/jim20170376

Abstract

Abstract:

Novel visible-light-responsive Au/Bi₂WO₆ heterogeneous nanostructures were successfully prepared through in situ growth gold nanoparticles (Au NPs) on the second-structural nanosheets of three-dimensional (3D) Bi₂WO₆ via a facile photoreduction process. XRD, FE-SEM, HR-TEM, FT-IR, XPS, and UV-Vis-DRS spectra were employed to investigate the phase composition, morgphology and light-absorption properties of as-preapared samples. Rhodamine B(RhB) and phenol were selected as model pollutants to evaluate photocatalytic activities of samples. The experimental results reveal that the as-prepared Au/Bi₂WO₆ heterogeneous nanostructures exhibit much higher photocatalytic activities than pure Bi₂WO₆ for dye degradation. It is also revealed that 1.5at%Au/Bi₂WO₆ sample exhibit the best photocatalytic activities in the degradation process of RhB and phenol, the apparent rate constant is about 1.5 and 2.2 times as high as that of pure Bi₂WO₆ under visible light irradiation, respectively. Moreover, the trapping experiments results show that photogenerated hole (h⁺) and ·O₂^- serve as the main active species for the photodegradation of RhB over Au/Bi₂WO₆ heterogeneous nanostructures. The enhanced photocatalytic efficiencies of Au/Bi₂WO₆ heterogeneous nanostructures are attributed to the charge transfer from Bi₂WO₆ to the deposited Au NPs as well as their surface plasmon resonance (SPR) absorption, which enhance the migration efficiency of the electron-holes and retard the recombination of electrons-hole pairs. Au NPs decorated Bi₂WO₆ heterogeneous nanostructures have considerable potential applications in solar-driven wastewater treatment.

Key words: Au/Bi₂WO₆ heterogeneous nanostructures, photocatalyst, photo-reduction process, electron transfer, surface plasmon resonance (SPR)

CLC Number:

O643

WANG Dan-Jun, WANG Chan, ZHAO Qiang, GUO Li, YANG Xiao, WU Jiao, FU Feng. Au Nanoparticles (NPs) Surface Plasmon Resonance Enhanced Photocatalytic Activities of Au/Bi₂WO₆ Heterogeneous Nanostructures[J]. Journal of Inorganic Materials, 2018, 33(6): 659-666.

Figures/Tables 9

Fig.1 XRD patterns of pure Bi2WO6 and Au/ Bi2WO6(a) Before calcinations; (b) After calcinations

Fig. 2 XPS spectra of 1.5at% Au/Bi2WO6 sample(a) Survey; (b) W4f; (c) Bi4f; (d) Au4f; (e) O1s

Fig. 3 High magnification SEM images of as-prepared samples(a)-(c) Pure Bi2WO6; (d)-(f) 1.5at% Au/Bi2WO6

Fig. 4 TEM/HR-TEM images of (a)-(c) pure Bi2WO6 and (d)-(f) 1.5% Au/Bi2WO6 heterogeneous nanostructures

Fig. 5 UV-Vis absorbance spectra of Au/Bi2WO6 heterogeneous nanostructures the Au/Bi2WO6 sample

Fig. 6 (a) Photocatalytic degradation acitvities and (b) apparent rate constant (kapp) for the degradation of different Au/Bi2WO6 photocatalysts on RhB

Fig. 7 (a) Photocatalytic acitvities of Bi2WO6 and 1.5at% Au/Bi2WO6 photocatalysts and (b) apparent rate constant (kapp) for the degradation over Bi2WO6 and 1.5at%Au/Bi2WO6 against phenol

Fig. 8 Trapping experiments of active species in the system of photodegradation of RhB by 1.5% Au/Bi2WO6 under visible light irradiation

Fig. 9 Schematic illustration of the detailed energy alignment in the Au/Bi2WO6 hegerogeneous nanostructure and the proposed mechanism of photocatalytic degradation of RhB by Au/Bi2WO6 under visible light irradiation

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Au Nanoparticles (NPs) Surface Plasmon Resonance Enhanced Photocatalytic Activities of Au/Bi₂WO₆ Heterogeneous Nanostructures

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