Hydrothermal Synthesis of Bismuth Vanadate Pigments by Sodium Vanadate

In this article,bismuth vanadate（BiVO₄）was hydrothermally synthesized respectively using sodium vanadate produced by sub-molten salt process from vanadium slag and bismuth nitrate pentahydrate（Bi（NO₃）₃·5H₂O）as raw materials.The optimal synthesis conditions for bismuth vanadate pigments were determined at the precursor solution pH of 7,n_Bi/n_V of 1,reaction temperature higher than 100 ℃ and reaction time more than 6 h.The chromaticity and oil absorption of the prepared monoclinic BiVO₄ satisfied the standard requirements,respectively.The experimental results show that bismuth vanadate with qualified chromaticity and oil absorption can also be obtained from sodium orthovanadate,sodium metavanadate or ammonium metavanadate under the same reaction conditions.Therefore,bismuth vanadate can be prepared from sodium vanadate with lower cost,which greatly improves the economy of the product.