Composition dependence of AgSbO_3/NaNbO_3 composite on surface photovoltaic and visible-light photocatalytic properties

摘要

The visible-light-active xAgSbO_3/NaNbO_3 (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 photo-electronic and photocatalytic properties were investigated. The absorption edge of the composites could be red-shifted increasing the amount of AgSbO_3 in comparison with that of NaNbO3. The surface photovoltage response shows the selectivity for the amount of AgSbO_3 in the samples. The photocatalytic activities for Rhodamine B degradation exhibit a parabola-like behavior with the amount of AgSbO_3. The highest photocatalytic activity is observed on the AgSbO_3/NaNbO_3 composite due to the better disper-siveness, electron transfer and surface photoelectric properties.