Dense Bi3Fe0.5Nb1.5O9 ceramics prepared by spark plasma sintering

Li, Juan; Cai, Yi Sheng; Yuan, Yuan; Chen, Zhi Hui; Zhou, Zheng; Fu, Bin; Sheng, Jia Wei

doi:10.1016/j.ceramint.2011.05.021

Cited by 3 publications

(1 citation statement)

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“…Bi 3 Fe 0.5 Nb 1.5 O 9 , as an Aurivillius-phase oxide with layer number of 2, has been synthesized by sintering method, and the physical properties (magnetic, dielectric, density, phonon, etc) of Bi 3 Fe 0.5 Nb 1.5 O 9 ceramics have been studied [34][35][36]. In this research, Bi 3 Fe 0.5 Nb 1.5 O 9 was synthesized by hydrothermal and was investigated as the visible-light photocatalyst for the first time.…”

Section: Introductionmentioning

confidence: 99%

Morphology effect on photocatalytic activity in Bi₃Fe_0.5Nb_1.5O₉

Yin

et al. 2018

Nanotechnology

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In this work, the Aurivillius-phase ferroelectric BiFeNbO were synthesized by hydrothermal (BFNO-H) and solid state methods (BFNO-S), respectively. The BFNO-H shows a hierarchical morphology, which is stacked by intersecting single-crystal nanosheets with {001} and {110} exposed facets, while the BFNO-S shows disorganized micron-scale morphology. BFNO-H shows a much stronger photodegradation activity (10.4 times and 9.8 times) than BFNO-S in the visible-light photodegradation of rhodamine B (RhB) and salicylic acid. The higher photodegradation activity of BFNO-H was firstly ascribed to the hierarchical structure and the larger specific surface area (16.586 m g) because a large specific surface area can increase reactive sites and shorten photogenerated carrier migration distance. However, after being normalized by the specific surface area, BFNO-H still performs better than BFNO-S, implying that the specific surface area is not the only factor that determines the photocatalytic activity. Considering that the built-in electric field originating from spontaneous polarization in BiFeNbO has existed in both ab plane and c direction, it matches well with the {001} and {110} exposed facets of BFNO-H nanosheets. This appropriate matching in BFNO-H nanosheets may improve the separation and transmission of photogenerated electron-hole pairs and further enhance its photocatalytic activity. Moreover, the trapping experiments reveals that holes (h ) are the main active species and hole-derived oxidation is the main redox reaction during photodegradation of organic pollutions.

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Section: Introductionmentioning

confidence: 99%