Study On Vanadate Samarium-Based Photocatalysts

China is a developing country holding the view of sustainable development. Environmental pollution and energy crisis is a major test of sustainable development. On this background, the work-hard researcher finds a new technology---photocatalytic technology, which can alleviate the energy crisis and control the environmental pollution.At room condition, the semiconductor photocatalyst absorb solar energy and then mineralize difficult degradable pollutants into harmless substances. Vanadate is a common semiconductor of n-type, its band gap is generally larger so it shows white. However, when it bound with a metal cation having d10s0 or with electronic configuration partially filled 4f orbital, the electronic structure of vanadate often will change and cause the band gap decreases, thus demonstrating the ability to respond to visible light, such as BiVO4, CeVO4, InVO4, SmVO4. In this paper, the basic carrier selected SmVO4 semiconductor, and we prepared some new composite photocatalysts and have done some related work.1、A series of GR/SmVO4 composite photocatalysts was successfully synthesized by a simple mixing, milling and heating method. The photocatalytic activity measurements demonstrate that the GR/SmVO4 photocatalysts show superior photoactivity in degradation of RhB under visible light irradiation.2%GR/SmVO4 show the better photocatalytic activity than others. The significant enhancement in activity could be attributed to the enhanced ability in RhB adsorption and separation of electron-hole pairs due to the addition of GR.2、AgX/SmV04 (X=Cl,1) composites were prepared by a simple mixing, milling and heating method. The as-prepared powders exhibit excellent performance in the degradation of dyes such as RhB under visible-light irradiation. Meanwhile, AgI/SmV04 displays much higher photocatalytic activity than AgCl/SmV04. Compare with AgCl/SmV04, the stronger photoactivity of the Agl-SmVO4 hybrid can be mainly ascribed to its good dye-adsorption ability and the suitable matching band potentials of AgI and SmVO4. In addition, the good dispersal of AgI in the composite due to its small particle size may also contribute the photoactivity. For the SmVO4 semiconductor, AgI is a better coupling semiconductor than AgCl.