Facile Synthesis of Bi/Bi2MoO6/TiO2 Composite Nanofibers with Enhanced Photocatalytic Activity under Visible Light

doi:10.15541/jim20180564

Abstract

Abstract:

The plasma Bi/Bi₂MoO₆/TiO₂ composite nanofibers were prepared via a facile one-step solvothermal method, using electrospun TiO₂ nanofibers as substrate, and glucose as reducing agent. The photocatalytic activity of the samples were evaluated by photodegradation of rhodamine B and 4-chlorophenol solution under visible light irradiation. The results showed that metal Bi nanoparticles were generated on the surface of Bi₂MoO₆ nanosheets via reduction of Bi ³⁺ in situ by glucose, meanwhile grew on the TiO₂ nanofibers surface. The photocatalytic activity of the Bi/Bi₂MoO₆/TiO₂ composites nanofibers can be further improved by depositing metallic Bi owing to its surface plasmon resonance. The RhB catalyzed by the sample was degraded by 95.8% under visible light irradiation for 50 min, and the degradation efficiency remained over 92% after 5 cycles while the 4-CP was degraded for 68.8% under visible light irradiation for 180 min. All above results suggest that the photocatalysts have good photocatalytic activity and stability.

Key words: metal Bi, plasma resonance effect, composite nanofibers, visible light photcatalysis

CLC Number:

O643

LI Xiao-Ping, LI Yue-Jun, CAO Tie-Ping, SUN Da-Wei, WANG Xia, XI Xiao-Tian. Facile Synthesis of Bi/Bi₂MoO₆/TiO₂ Composite Nanofibers with Enhanced Photocatalytic Activity under Visible Light[J]. Journal of Inorganic Materials, 2019, 34(11): 1193-1199.

Figures/Tables 11

Fig. 1 XRD patterns of different samples a: TiO2; b: BM/TO; c: Bi/BM/TO

Fig. 2 SEM images of TiO2 (a), BM/TO (b), Bi/BM/TO (c) and EDS pattern of sample Bi/BM/TO (d)

Fig. 3 TEM and HRTEM images of sample BM/TO(a, b) and Bi/BM/TO(c-f)

Fig. 4 XPS spectra of sample Bi/BM/TO (a) Survey scan; (b) Bi4f; (c) Mo3d; (d) Ti2p; (e) O1s

Fig. 5 UV-Vis diffuses reflectance spectra of different samples

Fig. 6 PL spectra of different samples

Fig. 7 Photocurrent of different samples

Fig. 8 Degradation curves of RhB by different samples under visible light irradiation (a) and corresponding first-order kinetics (b)

Fig. 9 Degradation curves of 4-CP by different samples under visible light irradiation (a) and corresponding first-order kinetics (b)

Fig. 10 Cycling runs of the photocatalytic degradation of RhB over Bi/BM/TO under visible irradiation

Fig. 11 Scheme 1 Proposed photocatalytic mechanism for photodegradation of organic pollutants over Bi/BM/TO

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Facile Synthesis of Bi/Bi₂MoO₆/TiO₂ Composite Nanofibers with Enhanced Photocatalytic Activity under Visible Light

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