Preparation method of monoclinic tungsten trioxide

The invention provides a preparation method of monoclinic tungsten trioxide. WO4(2-) in soluble tungstate capable of ionizing WO4(2-) in a solution is combined to H+ in a salpeter solution, unstable weak electrolyte H2WO4 is formed in hydrothermal reaction, and then H2WO4 is prompted to be dehydrated to form tungsten oxide. The technology of the method is simple, and the method is convenient to operate and low in cost. The prepared tungsten trioxide is uniform in particle size distribution, high in purity, high in activity, good in reproducibility and good in quality stability, and crystalline grains are monoclinic, and are fully refined. The high-purity monoclinic tungsten oxide has huge application prospect and excellent and remarkable physicochemical property in the fields of photoelectrochemistry, catalytic degradation, gas sensors, thermochromic devices and the like. Therefore, the preparation method of the monoclinic tungsten trioxide has relatively large practical significance on production and application of the tungsten oxide, and is suitable for being popularized and used in the industry.