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Effects of Synthesis Conditions on the Crystalline Phases and Photocatalytic Activities of Silver Vanadates via Hydrothermal Method

Published online by Cambridge University Press:  31 January 2011

Chao-Ming Huang ,
Guan T. Pan ,
Lung C. Chen ,
C.K. Thomas Yang  and
Wen S. Chang
Chao-Ming Huang
Affiliation:
charming@mail.ksu.edu.tw, Kun Shan University, Environmental Engineering, No. 949 Da-Wan Rd., Yung-Kang, 710, Taiwan, Province of China, +886 6 2050359, +886 6 2050540
Guan T. Pan
Affiliation:
t6679013@ntut.edu.tw, National Taipei University of Technology, Department of Chemical Engineering, Taipei, Taiwan, Province of China
Lung C. Chen
Affiliation:
lcchen@mail.ksu.edu.tw, Kun Shan University, Department of Polymer Materials, Yung-Kang, Taiwan, Province of China
C.K. Thomas Yang
Affiliation:
ckyang@ntut.edu.tw, National Taipei University of Technology, Department of Chemical Engineering, Taipei, Taiwan, Province of China
Wen S. Chang
Affiliation:
chang0719@itri.org.tw, Industrial Technology Research Institute, Energy and Environmental Laboratory, Hsinch, Taiwan, Province of China
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Abstract

Visible-light-driven Ag3VO4 photocatalysts were successfully synthesized using low-temperature hydrothermal synthesis method. Under various hydrothermal conditions, the structures of silver vanadates were tuned by manipulating the hydrothermal time and the ratio of silver to vanadium. X-ray diffraction (XRD) results reveal that the powders prepared in a stoichiometric ratio consisted of pure α-Ag3VO4 or mixed phases of Ag4V2O7 and α-Ag3VO4. With increasing the Ag-to-V mole ratio to 6:1, the resulting samples were identified as pure monoclinic structure α-Ag3VO4. UV-vis spectroscopy indicated that silver vanadate particles had strong visible light absorption with associated band gaps in the range of 2.2-2.5 eV. The sample synthesized in the excess silver exhibited higher photocatalytic activity than that synthesized in a stoichiometric ratio. The powder synthesized at silver-rich at 140℃ for 4 h (SHT4) exhibited the highest photocatalytic activity among all samples. The reactivity of SHT4 (surface area, 3.52 m2 g-1) on the decomposition of gaseous benzene was about 16 times higher than that of P25 (surface area, 49.04 m2 g-1) under visible light irradiation. A well developed crystallinity of Ag3VO4 of SHT 4 was considered to enhance the photocatalytic efficiency.

Keywords

catalytichydrothermalchemical synthesis
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1171: Symposium S – Materials in Photocatalysis and Photoelectrochemistry for Environmental Applications and H2 Generation , 2009 , 1171-S01-08
Copyright
Copyright © Materials Research Society 2009

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