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Acta Physico-Chimica Sinca  2016, Vol. 32 Issue (2): 551-557    DOI: 10.3866/PKU.WHXB201511304
ARTICLE     
Bi2Sn2o7 Visible-Light Photocatalysts: Different Hydrothermal Preparation Methods and Their Photocatalytic Performance for As(Ⅲ) Removal
Jian-Dong ZHUANG1,*(),Qin-Fen TIAN1,Ping LIU2
1 College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China
2 State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
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Abstract  

Bi2Sn2o7, synthesized through different hydrothermal routes (the microwave hydrothermal method (MH-BSo) and the traditional hydrothermal method (TH-BSo)), was used for photocatalytic removal of arsenic from aqueous solution. The as-synthesized Bi2Sn2o7 products were characterized by X-ray diffraction (XRD), N2 sorption-desorption, UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), transmission electron microscopy (TEM), electron spin resonance (ESR), X-ray photoelectron spectra (XPS), and electrochemistry technology. Under visible light irradiation, the MH-BSo sample exhibited a higher photocatalytic activity (up to 98.7%) than that of the TH-BSo sample during the oxidization of arsenite (Aso3)3-. The active species, o2-• and hVB+, were identified as the primary active species responsible for As(Ⅲ) oxidation. In addition, a possible mechanism for the photo-oxidation of As(Ⅲ) over Bi2Sn2o7 is proposed.



Key wordsBi2Sn2o7      Microwave hydrothermal method      Traditional hydrothermal method      Visible-light photocatalysis      As(Ⅲ) oxidation     
Received: 06 October 2015      Published: 30 November 2015
MSC2000:  o643  
Fund:  the National Natural Science Foundation of China(21303244);Outstanding Youth Fund of Fujian Agriculture andForestry University, China(XJQ201419)
Corresponding Authors: Jian-Dong ZHUANG     E-mail: jdzhuang113@163.com
Cite this article:

Jian-Dong ZHUANG,Qin-Fen TIAN,Ping LIU. Bi2Sn2o7 Visible-Light Photocatalysts: Different Hydrothermal Preparation Methods and Their Photocatalytic Performance for As(Ⅲ) Removal. Acta Physico-Chimica Sinca, 2016, 32(2): 551-557.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201511304     OR     http://www.whxb.pku.edu.cn/Y2016/V32/I2/551

Fig 1 XRD patterns of the Bi2Sn2O7 samples prepared via different preparation methods
Fig 2 TEM (A, B), high-resolution TEM (HRTEM) (C, D) and selected area electron diffraction (SAED) (E, F) images of the Bi2Sn2O7 (BSO) samples prepared via different hydrothermal methods
Fig 3 N2-sorption isotherms and corresponding pore size distribution curves (inset) of the BSO samples prepared via different hydrothermal methods
Fig 4 UV-Vis diffuse reflection spectra of the BSO samples prepared via different hydrothermal methods
SampleConditionsCrystallite size/nmSBET/(m2?g-1)Pore size/nmEBG/eVw(As(Ⅲ) oxidation)/%
TH-BSO-200200 ℃, 24 h, pH = 1215.457.889.72.8894.6
MH-BSO180 ℃, 1 h, pH = 1211.274.181.6/3.82.9098.7
Table 1 Data of the BSO samples prepared by traditional hydrothermal and microwaves hydrothermal methods
Fig 5 Temporal changes in the concentrations of As(Ⅲ) under different experimental conditions (A) and As (total) under visible light illumination (B)
Fig 6 As 3d XPS spectra of As species adsorbed on BSO photocatalyst before (A) and after (B) photocatalytic reaction
Fig 7 ESR spectra of DMPO-O2 -? and DMPO-?OH in BSO methanol and water dispersion
Fig 8 Proposed mechanism for the visible light photocatalytic oxidation of As(Ⅲ) on Bi2Sn2O7 sample
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