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In this study, Bi2WO6 nanosheets were synthesized via molten salt (M-Bi2WO6) and hydrothermal method (H-Bi2WO6), respectively. Powder X-ray diffraction and scanning electron microscopy measurements demonstrated that the as-prepared Bi2WO6 samples preferred orientated alone {001} plane in both hydrothermal and molten salt system, enabling the formation of Bi2WO6 nanosheets. The results of UV-vis diffuse reflection spectrum showed that the M-Bi2WO6 nanosheets exhibited an obvious red shift in visible light absorption band in comparison with H-Bi2WO6 nanosheets, and the band gap of M-Bi2WO6 and H-Bi2WO6 nanosheets was 2.49 and 2.62 eV, respectively. As a result, the M-Bi2WO6 nanosheets reached as high as 97.13% of photodegradation efficiency of Rhodamine B under 180 min of sunlight irradiation, which was two times higher than that of the H-Bi2WO6 nanosheets (86.88%). Meanwhile, the photodegradation rate over M-Bi2WO6 (97.30%) for TC degradation was about two times higher than that of H-Bi2WO6 (78.58%). The much-enhanced photocatalytic performance of M-Bi2WO6 nanosheets was attributed to the better crystallinity, higher light-harvesting capability and superior sorption capacity. Basing on the detailed experimental study and analysis, this work could be a practical guidance for the fabrication of Bi2WO6-based microstructures with enhanced photocatalytic efficiency. [ABSTRACT FROM AUTHOR]

The bluish-green KBaY(BO):Eu phosphors were prepared by high-temperature solid state reaction method. The photoluminescence properties, concentration quenching and energy transfer as well as the luminescence decays were investigated. The emission spectrum showed a single intensive band centered at 500 nm, which correspond to the 4 f 5 d → 4 f transition of Eu. The optimal concentration for the luminescence of Eu in KBaY(BO):Eu was determined to be 0.03 mol. The critical energy transfer distance was calculated as 21.34 Å. The corresponding concentration quenching mechanism was verified to be a dipole-dipole interaction. And the blue-shift behavior of KBaY(BO):Eu with increasing temperature was analyzed by the configurational coordinate diagram. The results indicate that the KBaY(BO):Eu phosphors have potential applications as an ultraviolet-convertible phosphor due to its effective excitation in the ultraviolet rang. [ABSTRACT FROM AUTHOR]