Controllable synthesis of WO3·nH2O microcrystals with various morphologies by a facile inorganic route and their photocatalytic activities

WO3·nH2O microcrystals with different shapes have been synthesized via a facile inorganic hydrothermal route. By controlling the amount of Na2SO4 in the precursor solution, hexagonal WO3·0.33H2O nanoplates, WO3 nanorods, and octahedron-shaped WO3·0.5H2O crystals have been obtained, highlighting the role of Na2SO4 in the growth of WO3·nH2O crystals. Based on the experimental observations, we have discussed the growth mechanisms of the WO3·nH2O crystals. The adsorption ability and photocatalytic activities of tungsten trioxide hydrates have also been investigated, and the results show that the WO3·0.33H2O nanoplates with large surface areas show the largest adsorption ability, and WO3·0.5H2O octahedral microcrystals with large bare crystal face exhibit the highest photodegradation performance in these samples, rendering their potential application in the treatment of organic pollutants.

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