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. 2018 May 11;13(1):148.
doi: 10.1186/s11671-018-2558-6.

Fabrication and Photocatalytic Property of Novel SrTiO3/Bi5O7I Nanocomposites

Yongmei Xia  1   2 , Zuming He  3   4 , Jiangbin Su  5   6 , Ya Liu  2 , Bin Tang  7   8
Affiliations

Fabrication and Photocatalytic Property of Novel SrTiO3/Bi5O7I Nanocomposites

Yongmei Xia et al. Nanoscale Res Lett. .

Abstract

The novel SrTiO3/Bi5O7I nanocomposites were successfully fabricated by a thermal decomposition approach. The as-prepared samples were characterized by XRD, XPS, SEM, EDS, FTIR, DRS and PL spectra. The results show that the SrTiO3/Bi5O7I nanocomposites are composed of perovskite SrTiO3 nanoparticles and tetragonal Bi5O7I nanorods. The SrTiO3/Bi5O7I nanocomposites exhibit an excellent photocatalytic performance for the degradation of RhB solution under simulated solar light irradiation, which is superior to that of pristine Bi5O7I and SrTiO3. In particular, the 30 wt% SrTiO3/Bi5O7I nanocomposite is found as the optimal composites, over which the dye degradation reaches 89.6% for 150 min of photocatalysis. The photocatalytic degradation rate of the 30 wt% SrTiO3/Bi5O7I nanocomposite is found to be 3.97 times and 12.5 times higher than that of bare Bi5O7I and SrTiO3, respectively. The reactive species trapping experiments suggest that [Formula: see text] and holes are the main active species responsible for the RhB degradation. In addition, the PL spectra elucidate the effective separation of photoinduced electron-hole pairs. Further, the possible photocatalytic mechanism of the SrTiO3/Bi5O7I nanocomposites is also elucidated based on the experimental evidences.

Keywords: Bi5O7I; Mechanism; Nanocomposite; Photocatalytic; SrTiO3.

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Conflict of interest statement

Authors’ information

Zuming He is a professor and a Ph. D. degree holder specializing in the investigation of photocatalytic and nanometer materials. Yongmei Xia is an associate professor and a Ph. D. degree holder specializing in the investigation of photocatalytic and optical materials. Bin Tang is a professor and a Ph. D. degree holder specializing in the investigation of optical materials. Ya Liu is a professor and a Ph. D. degree holder specializing in the investigation of optical and nanometer materials. Jiangbin Su is a professor and a Ph. D. degree holder specializing in the nanofabrication and the electron beam-induced nanoinstability and nanoprocessing.

Competing interests

The authors declare that they have no competing interests.

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Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
XRD patterns of pure Bi5O7I, SrTiO3 and 30 wt% SrTiO3/Bi5O7I nanocomposite
Fig. 2
Fig. 2
XPS patterns of the 30 wt% SrTiO3/Bi5O7I nanocomposites: a survey, b Bi 4f, c I 3d , d Ti 2p, e Sr 3d, and f O1s
Fig. 3
Fig. 3
SEM images of a pure SrTiO3, b pure Bi5O7I, c 30 wt% SrTiO3/Bi5O7I nanocomposite, and d EDS spectrum of 30 wt% SrTiO3/Bi5O7I nanocomposite
Fig. 4
Fig. 4
a DRS spectra of SrTiO3/Bi5O7I nanocomposites and b the Tauc plot of (Ahν)1/2 versus hν the pure Bi5O7I and 30 wt% SrTiO3/Bi5O7I nanocomposite, the Tauc plot of (Ahν)2 versus hν the pure SrTiO3 inset picture of b
Fig. 5
Fig. 5
FTIR spectra of the pure Bi5O7I and SrTiO3/Bi5O7I nanocomposites
Fig. 6
Fig. 6
a Photocatalytic degradation of RhB solution for all samples under simulated solar light irradiation. b Plots of -ln(Ct/C0) vs time for all samples. c Photocatalytic degradation of RhB solution for all samples under UV light illumination. d Cycling degradation efficiency of RhB over the SrTiO3/Bi5O7I nanocomposites
Fig. 7
Fig. 7
The degradation efficiency constant of RhB over the 30 wt% SrTiO3/Bi5O7I nanocomposite in the presence of various scavengers
Fig. 8
Fig. 8
PL spectra of pure Bi5O7I nanosheets and 30 wt% SrTiO3/Bi5O7I nanocomposite
Fig. 9
Fig. 9
The schematic energy band diagram and possible photocatalytic process of SrTiO3/Bi5O7I nanocomposites
See this image and copyright information in PMC

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