Key Words:Light;Azo dyes - Crystal microstructure - Crystal structure - Degradation - Electron diffraction - Energy gap - High resolution transmission electron microscopy - Microstructure - Nanosheets - Photocatalysis - Photocatalysts - Photodegradation - Plates (structural components) - Solid state reactions;Absorption edges - Degradation efficiency - Nano-structured - Photocatalytic activities - Photocatalytic performance - Selected area electron diffraction analysis - Visible light responsive - Visible-light irradiation
Abstract:Novel plate-stratiform nanostructured Bi12O17Cl2 was studied with its visible-light photocatalytic performance. The Bi12O17Cl2 photocatalyst synthesized by a solid-state reaction was constructed of dozens of primary nanosheets, which were stacked by a parallel array of ultrathin secondary nanosheets. The microstructure and crystal structure of Bi12O17Cl2 primary and secondary nanosheets were discovered by high-resolution transmission electron microscopy and selected-area electron diffraction analyses. Its absorption edge was determined as about 590 nm and the band gap energy was 2.1 eV. The Bi12O17Cl2 nanomaterial exhibited superior visible-light-responsive photocatalytic activity and confirmed successful photodegradation of methyl orange (MO) under visible-light irradiation. The degradation efficiency was up to 97% in 90 min. Furthermore, the Bi12O17Cl2 photocatalyst exhibited excellent photostability and high mineralization capacity for MO photodegradation reaction. The MO photodegradation process was dominated by the direct photocatalytic mechanism. The contribution from its morphology and microstructure to superior photocatalytic activity was discussed. Copyright © International Centre for Diffraction Data 2016.
Volume:31
Issue:1
Translation or Not:no