Abstract
Microcrystalline ABi 2Nb 2O 9 ( A=Sr, Ba) photocatalysts were successfully synthesized by a citrate complex method. The as-prepared samples were characterized by the X-ray diffraction technique, BET surface area analysis, UV–vis diffuse reflectance spectrum, transmission electron microscopy, X-ray photoelectron spectroscopy and inductively coupled plasma-atomic emission spectrometry. The results indicated that single-phase orthorhombic SrBi 2Nb 2O 9 could be obtained after being calcined above 650 °C, while BaBi 2Nb 2O 9 was tetragonal. Based on the diffuse reflectance spectra, the band gaps of the obtained samples were calculated to be around 3.34–3.54 eV. For the photocatalytic redox reaction of methyl orange under UV-light irradiation, SrBi 2Nb 2O 9 exhibited higher photocatalytic activity than that of BaBi 2Nb 2O 9. The effects of the crystallinities, BET surface areas and crystal structures of the samples on the photocatalytic activities were discussed in detail.
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