In this study the effects of various anions (SO2−
4 and PO3−
4) were investigated on the hydrothermal treatment of WO3 from Na2WO4 and HCl at 180 and 200 °C.
The products were analyzed by XRD and SEM. With the usage of SO2−
4 the obtained product was hexagonal (h-) WO3 in the form of nanorods at both temperatures. Applying ClO−
4 resulted in a mixture of WO3·0.33H2O
and small amount of m-WO3 at 180 °C and pure WO3·0.33H2O at 200 °C. The morphology was consisted of cuboid shapes arranged into spherical structures at 180 °C and longitudinal ones at 200 °C. By the application of PO3−
no product formed at either temperature. Using the combination of SO2−
4, and ClO−
4 the product was h-WO3 at both 180 and 200 °C with rod-like crystals; thus, the effect of ClO−
4 was overdominated
by the SO2−
4ions. Utilization of PO3−
4 together with SO2−
4, and/or ClO−
4 resulted again in no product, meaning that adding PO3−
4 to the reaction mixture
completely blocks the hydrothermal formation of solid products by forming water soluble phosphotungstic acids.
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Document Type: Research Article
Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Műuegyetem Rakpart 3, Budapest, H-1111, Hungary
Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, H-1121, Hungary
January 1, 2019
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