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The visible-light-active xAgSbO/NaNbO ( x=0.5, 1, 2, 4, 6) composite photocatalysts were prepared by a conventional solid-state reaction method. Composition dependences on the structure, optical, surface photoelectronic and photocatalytic properties were investigated. The absorption edge of the composites could be red-shifted increasing the amount of AgSbO in comparison with that of NaNbO. The surface photovoltage response shows the selectivity for the amount of AgSbO in the samples. The photocatalytic activities for Rhodamine B degradation exhibit a parabola-like behavior with the amount of AgSbO. The highest photocatalytic activity is observed on the AgSbO/NaNbO composite due to the better dispersiveness, electron transfer and surface photoelectric properties. [ABSTRACT FROM AUTHOR]

BaSnO grains with a rhombic dodecahedron shape have been synthesized via a facile modified hydrothermal approach. The structure and morphology evolution during hydrothermal treatment have been investigated with X-ray diffraction, scanning electron microscopy, and Raman and Fourier transform infrared spectroscopy. The sample with the single-phase of BaSnO can be obtained at the hydrothermal temperature of 24 °C, and the grain size grows with an increasing temperature from 10 to 15 μm below 270 °C. But the grain size decreases sharply to 4 μm when the temperature reaches 280 °C. The optical absorption and surface photovoltage spectroscopy analysis indicate that controlling the size and shape is of great importance in tuning photophysical properties of BaSnO powders. [ABSTRACT FROM AUTHOR]