Synthesis, crystal structure, and photocatalytic activity of a new two-layer Ruddlesden-Popper phase, Li{sub 2}CaTa{sub 2}O{sub 7}

Journal Article · Tue Apr 15 00:00:00 EDT 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.01.042· OSTI ID:21128270

Zhenhua, Liang ^[1]; Kaibin, Tang ^[1]; Qian, Shao; Guocan, Li; Suyuan, Zeng ^[1]; Huagui, Zheng ^[2]

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1. Nanomaterial and Nanochemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)
2. Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026 (China)

A new two-layer Ruddlesden-Popper phase Li{sub 2}CaTa{sub 2}O{sub 7} has been synthesized for the first time. The detailed structure determination of Li{sub 2}CaTa{sub 2}O{sub 7} performed by powder X-ray diffraction (XRD) and electron microscopy (ED) shows that it crystallizes in the space group Fmmm [a{approx}5.5153(1), b{approx}5.4646(1), c{approx}18.2375(3)A]. UV-visible diffuse reflection spectrum of the prepared Li{sub 2}CaTa{sub 2}O{sub 7} indicates that it had absorption in the UV region. The photocatalytic activity of the Li{sub 2}CaTa{sub 2}O{sub 7} powders was evaluated by degradation of RhB molecules in water under ultra visible light irradiation. The results showed that Li{sub 2}CaTa{sub 2}O{sub 7} has high photocatalytic activity at room temperature. Therefore, the preparation and properties studies of Li{sub 2}CaTa{sub 2}O{sub 7} with a two-layer Ruddlesden-Popper structure suggest potential future applications in photocatalysis. - Graphical abstract: Crystal structure of a two-layer Ruddlesden-Popper phase Li{sub 2}CaTa{sub 2}O{sub 7} A new two-layer Ruddlesden-Popper phase Li{sub 2}CaTa{sub 2}O{sub 7} has been synthesized for the first time. Li{sub 2}CaTa{sub 2}O{sub 7} crystallizes in the space group Fmmm determined by powder X-ray and electron diffraction. UV-visible diffuse reflection spectra and the photocatalytic degradation of RhB molecules in water under ultra visible light irradiation show that Li{sub 2}CaTa{sub 2}O{sub 7} is a potential material in photocatalysis.

• OSTI ID: 21128270
• Journal Information: Journal of Solid State Chemistry, Vol. 181, Issue 4; Other Information: DOI: 10.1016/j.jssc.2008.01.042; PII: S0022-4596(08)00066-2; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
CALCIUM COMPOUNDS
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
IRRADIATION
LAYERS
LITHIUM COMPOUNDS
ORTHORHOMBIC LATTICES
OXIDES
PEROVSKITE
PHOTOCATALYSIS
REFLECTION
SPACE GROUPS
SPECTRA
SYNTHESIS
TANTALUM COMPOUNDS
TEMPERATURE RANGE 0273-0400 K
X RADIATION
X-RAY DIFFRACTION