Preparation method and application of WO3/tungstate composite photocatalytic material with grain boundary

The invention discloses a preparation method and application of a WO3/tungstate composite photocatalytic material with a grain boundary, and belongs to the field of environment treatment. The method is to prepare the tungsten trioxide/tungstate composite photocatalytic material through a cation exchange hydrothermal method. Two homologues with similar crystal structures are used for constructing the Z-type WO3/tungstate homologue composite photocatalytic material taking a grain boundary (a tightly contacted phase interface) as a phase interface. Due to the existence of the grain boundary, thenumber of phase interfaces in the system is reduced, the resistance between the interfaces is reduced, and the transmission rate of photon-generated carriers is greatly improved. When the compounded homologue photocatalytic material degrades rose-bengal, the degradation rate reaches dozens of times of that of pure-phase WO3. Due to close contact between phase interfaces, the prepared WO3/tungstatehas a very stable crystal