Abstract: The Bi₂WO₆ catalyst was prepared by hydrothermal method with （Bi（NO₃）₃·5H₂O）and （Na₂WO₄·2H₂O） as raw materials，using NaOH and NH₃·H₂O as pH regulator，respectively. The properties of the catalyst were investigated by XRD，SEM，UV-Vis，and BET tests，the effects of different alkali liquor on crystal form，morphology，absorbency and specific surface area of the catalyst were analyzed. The results indicated that the samples using NaOH to adjust pH had better crystal form，regular sheet structure and smaller energy band gap with 2.88 eV because of UV-Vis absorption edge red-shift. The specific surface area of the sample using NH₃·H₂O was 34% bigger than using NaOH. According to degradation of simulated wastewater of Rhodamine B in the visible region of λ > 400 nm，the results showed that the photocatalytic efficiency of Bi₂WO₆ with pH regulated by NaOH was higher，while using NH₃·H₂O was relatively lower.

Key words: bismuth tungstate（Bi₂WO₆）, hydrothermal method, photocatalytic degradation