ISSN: 1003-6326
CN: 43-1239/TG

Vol. 21    No. 7    July 2011

Hydrothermal synthesis and photocatalytic property of BiVO4 nanosheets
CHEN Yuan1, 2, ZHOU Ke-chao2, HUANG Su-ping2 , LI Zhi-you2, LIU Guo-cong1, 3
(1. Institute of Advanced Materials and Chembiosensing Technology, Yulin Normal University, Yulin 537000, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
Abstract: Using Bi(NO3)3·5H2O and NH4VO3 as raw materials, square BiVO4 nanosheet were synthesized by hydrothermal method with ethylenediamine tetraacetic acid (EDTA) as chelating agent. The properties of the as-prepared samples were investigated by XRD, SEM, HRTEM, Raman, DRS and BET tests. The effect of pH on the phase and morphology of samples was studies. The results show that high crystallinity BiVO4 nanosheet shapes with crystalline monoclinic structure, whose width varies in the range of 0.6−1.0 μm and length in the range of 200−300 nm, can be obtained via a hydrothermal route assisted by EDTA. Compared with m-BiVO4 particle, the absorption band of the microrod assisted by 2.0 g EDTA presents a little red shift and its band gap is narrowed to 2.37 eV. The BiVO4 samples with platelike, square shape, square massive, brick-shaped structure can be obtained by controlling the pH value in the synthesis process. These BiVO4 samples have certain photocatalytic activity under the visible light irradiation. A much higher photocatalytic activity of the square nanosheet is found under visible light irradiation with a 100% degradation of methylene blue (MB) of 10 mg·L−1 solution after visible light irradiation for 120 min.
Key words: BiVO4; hydrothermal synthesis; EDTA; photocatalyst property
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)