A novel Bi-based phosphomolybdate photocatalyst K{sub 2}Bi(PO{sub 4})(MoO{sub 4}): Crystal structure, electronic structure and photocatalytic activity

Journal Article · Sat Mar 01 00:00:00 EST 2014 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.01.002· OSTI ID:22348624

Huang, Hongwei ^[1]; Chen, Gong; Wang, Shuobo ^[1]; Kang, Lei; Lin, Zheshuai ^[2]; Zhang, Yihe ^[1]

---

1. National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China)
2. Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)

Graphical abstract: - Highlights: • A new type of phosphomolybdate K{sub 2}Bi(PO{sub 4})(MoO{sub 4}) photocatalyst was successfully synthesized. • The products synthesized at 600 °C were mainly composed of nano-cubes. • The indirect band gap of K{sub 2}Bi(PO{sub 4})(MoO{sub 4}) has been determined to be 2.93 eV. • K{sub 2}Bi(PO{sub 4})(MoO{sub 4}) synthesized at 600 °C exhibits the highest photocatalytic activity. • The electronic structure was calculated by density functional calculations. - Abstract: A novel phosphomolybdate photocatalyst K{sub 2}Bi(PO{sub 4})(MoO{sub 4}) has been successfully developed via a solid-state reaction. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), diffuse reflectance spectrum (DRS) and photoluminescence (PL) spectra. The photocatalytic activities of the samples prepared at different temperature were determined by the photooxidative decomposition of methylene blue (MB) in aqueous solution. The results revealed that K{sub 2}Bi(PO{sub 4})(MoO{sub 4}) can be used as an effective photocatalyst under UV–vis irradiation and the nanocubes obtained at 600 °C exhibits the highest photocatalytic activity. The photodegradation of MB by K{sub 2}Bi(PO{sub 4})(MoO{sub 4}) nanocrystals followed the first-order kinetics. Theoretical calculations on electronic structure confirmed the indirect optical transitions property in the absorption edge region of K{sub 2}Bi(PO{sub 4})(MoO{sub 4}), and the orbital constitutions of CB and VB were also analyzed.

• OSTI ID: 22348624
• Journal Information: Materials Research Bulletin, Vol. 51; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
AQUEOUS SOLUTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DENSITY FUNCTIONAL METHOD
ELECTRONIC STRUCTURE
IRRADIATION
METHYLENE BLUE
MOLYBDATES
NANOSTRUCTURES
PHOSPHATES
PHOTOCATALYSIS
PHOTOLUMINESCENCE
SCANNING ELECTRON MICROSCOPY
SOLIDS
SPECTRA
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION