Synthesis of NiWO4 powder crystals of polyhedron for photocatalytic degradation of Rhodamine

The NiWO 4 powder crystals were synthesized by a simple hydrothermal method . It is found that the morphologies of most of NiWO 4 particles are the polyhedron including cube, decahedron and dodecahedron et al. The typical cubic structures show the side length around 3 μm. SEM, TEM, XRD , FTIR and UV-vis were employed to characterize the NiWO 4 powder crystals. The band gap value of 1.48 eV was calculated according to UV-vis. The NiWO 4 powder crystals exhibit high photocatalytic activity toward the degradation of Rh B under both UV and visible irradiations. Especially, under UV, only 17% Rh B remains after 40 min UV photodegradation and only 80 min is needed for the complete degradation.