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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

Front. Mater. Sci.    2018, Vol. 12 Issue (4) : 415-425    https://doi.org/10.1007/s11706-018-0442-z
RESEARCH ARTICLE
Synthesis of sillenite-type Bi36Fe2O57 and elemental bismuth with visible-light photocatalytic activity for water treatment
Chuan DENG1,2, Xianxian WEI1(), Ruixiang LIU2, Yajie DU1, Lei PAN1, Xiang ZHONG1, Jianhua SONG1
1. College of Environment and Safety, Taiyuan University of Science and Technology, Taiyuan 030024, China
2. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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Abstract

With Fe(NO3)3·9H2O and Bi(NO3)3·5H2O as raw materials, different sillenite-type compounds and elemental bismuth were prepared by a facile one-pot solvothermal method using H2O, C2H5OH, (CH2OH)2 and C3H8O3 as solvents, respectively. The structure, morphology, elemental compositions and properties of samples were examined by XRD, SEM, TEM, ICP, XPS, N2 adsorption and desorption, UV-vis DRS and PL. The photocatalytic activities of different samples were evaluated by the photodegradation of RhB under visible-light irradiation (l>400 nm), and results show that Bi36Fe2O57 prepared using C2H5OH as the solvent owns the optimum performance. In order to explore the reaction mechanism, an additional experiment was designed to investigate the main active species during the photodegradation process via dissolving different trapping agents in the reaction solution before light irradiation. The results show that superoxide radical anions play a major role in this system since the RhB degradation was significantly suppressed after the addition of benzoquinone.

Keywords photocatalysis      sillenite      elemental Bi      Bi36Fe2O57     
Corresponding Author(s): Xianxian WEI   
Online First Date: 29 November 2018    Issue Date: 10 December 2018
 Cite this article:   
Chuan DENG,Xianxian WEI,Ruixiang LIU, et al. Synthesis of sillenite-type Bi36Fe2O57 and elemental bismuth with visible-light photocatalytic activity for water treatment[J]. Front. Mater. Sci., 2018, 12(4): 415-425.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-018-0442-z
https://academic.hep.com.cn/foms/EN/Y2018/V12/I4/415
Fig.1  XRD patterns: (a) BFO and BFO–C2H5OH; (b) Bi–(CH2OH)2 and Bi–C3H8O3.
Fig.2  XPS results: (a) full spectrum of BFO–C2H5OH; (b)(c)(d) high-resolution spectra of Bi, Fe and O elements.
Method Surface elemental compositions Bulk elemental compositions Molar ratio of n(Bi)/n(Fe)
c(Bi)/at.% c(Fe)/at.% w(Bi)/mass% w(Fe)/mass%
XPS 8.43 12.53 0.67
ICP 59.13 30.43 0.52
Tab.1  Surface and bulk elemental compositions of BFO–C2H5OH resulting from XPS and ICP analyses
Fig.3  SEM images of (a) BFO, (b) BFO–C2H5OH, (c) Bi–(CH2OH)2 and (d) Bi–C3H8O3.
Fig.4  Morphologies and structures of polycrystalline (upper) and single-crystalline (lower) in BFO–C2H5OH: (a)(c) TEM and SAED (inset) images; (b)(d) corresponding HRTEM images.
Fig.5  Nitrogen adsorption–desorption isotherm plots and corresponding PSD curves (inset): (a) BFO and BFO–C2H5OH; (b) Bi–(CH2OH)2 and Bi–C3H8O3.
Sample SBET/(m2·g−1) Vpore/(cm3·g−1) Dpore/nm
BFO 86.44 0.315 14.598
BFO–C2H5OH 100.07 0.195 7.798
Bi–(CH2OH)2 137.46 0.385 11.211
Bi–C3H8O3 178.86 0.216 4.835
Tab.2  Structure parameters of different photocatalysts
Fig.6  (a) UV-vis DRS results of different catalysts and (b) the optical absorption edges.
Fig.7  PL spectra of different samples with the excitation wavelength of 260 nm.
Fig.8  (a) The reaction process and (b) the pseudo-first-order rate constant for the photocatalytic degradation of RhB with different catalysts.
Fig.9  Reaction process for the photocatalytic degradation of RhB on BFO–C2H5OH with and without trapping agents.
Fig.10  The suggested mechanism diagram of the photocatalytic reaction.
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