Bismuth Tungstate

Introduction

Chinese Name：钨酸铋
CAS Number：13595-87-4
Chemical Formula：Bi₂WO₄
Molecular Weight：1161.47000
Exact Weight：1161.75000

Bismuth tungstate is the simplest oxide in bismuth oxide-based layered perovskite, the main shapes of Bi₂WO₆ are like tires, efflorescent, heliciform, flake, nested, graded microspheres and nano-cage type. As a newly developed visible light catalyst, energy gap of Bi₂WO₆ is only 2.8eV. Because the property of material has a big relation to its size and morphology. Developing Bi₂WO₆ of different sizes can promote its catalytic property has become the research emphasis of Bi₂WO₆.

Recently, the study shows that the newly nano materials has visible light catalytic which can be applied in the solar energy conversion, decomposition of water and environmental pollution treatment. Among which bismuth tungstate has perfect visible light catalytic in the visible light and catch a lot of peaple's attention. In 2004, Tang firstly reported that Bi₂WO₆ can degrade organic pollutant like CHCL₃ and CH₃CHO.

Use the quantity ratio 2:1 of Bi( NO3)3•5H₂O and Na₂WO₄•2H₂O powder as raw material, with the assistance of surfactant PVP, hydrothermal reacting for 48h under 180 degree celsius. This method can produce Bi₂WO₆ nano material of fine crystallization, the higher rate of hydroxyl radical generation. After 6 hours' hydrothermal reaction, the sample is under non-crystallization status; If the reacting time is over than 72h, it can not do benefit to promote the property of visible light catalytic of Bi₂WO₆.