The Influence of Different Molten Salt Systems on Zinc and Bismuth Tungstate Formation

The influence of different molten salt environments on formation of tungstates has been studied. Well crystalline and pure Bi 2 WO 6 have been prepared in potassium nitrite KNO 2 (350°C), potassium chloride KCl (800°C) and mixture of potassium-sodium sulphates K 2 SO 4 -Na 2 SO 4 (800°C), but ZnWO 4 have been successfully synthesized in sodium nitrate NaNO 3 (350°C), mixture of sodium-potassium chlorides NaCl-KCl (680°C), potassium chloride KCl (780°C) and mixture of potassium-sodium sulphates K 2 SO 4 -Na 2 SO 4 (850°C). The higher surface area and photocatalytic activity show powders prepared at lower temperature.