Hydrothermal Synthesis, Crystal Structure, and Visible‐Region Photocatalytic Activity of BaBi2O6. Issue 17 (19th June 2017)

• Record Type: Journal Article
• Authors: Saiduzzaman, Md; Yanagida, Sayaka; Takei, Takahiro; Moriyoshi, Chikako; Kuroiwa, Yoshihiro; Kumada, Nobuhiro
• Is Part Of: ChemistrySelect. Volume 2:Issue 17(2017)
• Page Start: 4843
• Page End: 4846
• Publication Date: 2017-06-19
• Subjects: DOS -- Hexagonal cell -- Hydrothermal synthesis -- Photocatalyst -- X-ray diffraction; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201700973
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The pentavalent bismuthate BaBi2 O6 was prepared by a low‐temperature hydrothermal reaction using NaBiO3 .nH2 O and Ba(OH)2 .8H2 O as starting materials. The X‐ray powder diffraction pattern was indexed with a hexagonal cell (space group: P‐31 m), the same as a PbSb2 O6 ‐type crystal. The crystal structure of this compound was refined using synchrotron X‐ray powder diffraction data. The cell parameters were found to be a =5.57534(6) and c =5.7381(1) Å and the final reliability (R) factors obtained by Rietveld analysis were Rwp =5.15 % and Rp =3.62 %. This compound exhibited profound photocatalytic activity for phenol decomposition under visible light irradiation. Abstract : BaBi2 O6 crystal structure same as PbSb2 O6 ‐type structure, consists of two different alternating octahedral layers (BaO6 and BiO6). Along the a ‐ or b ‐axis it exhibits the layer structure (Figure a), but along the c ‐axis it shows the hexagonal tunnel structure (Figure b) by edge sharing of BiO6 octahedra. Ba atom sited at the centre of the tunnel. At the bottom of conduction band hybridized Bi 6 s and O 2p orbital is responsible for the high photocatalytic activity in the visible region.