以 Bi(NO3)3?5H2O 和 Na2WO4?2H2O为原料，采用水热法制备 Bi2 WO6催化剂，在λ＞420 nm的可见光区降解模拟罗丹明 B(RhB)废水，研究前驱物pH 值、水热反应温度和时间对 Bi2 WO6催化性能的影响；通过 X 射线衍射(XRD )、扫描电镜(SEM)、紫外-可见吸收光谱(UV-Vis )和比表面积(BET)表征，考察前驱物 p H 值对催化剂晶型、形貌、吸光性和比表面积的影响.结果表明，前驱物 pH 值为Bi2 WO6光催化活性的关键影响因素，且对产物微观结构影响较大.当 pH 值＝4．5时合成的产物光催化活性最佳，反应90 min RhB 溶液降解率达到99．90％，经重复使用4次，其光催化效果无明显降低，表明该Bi2 WO6是一种有效稳定的可见光催化剂.
Bi2WO6 was synthesized by hydrothermal method using Bi(NO3)3??5H2O and Na2WO4??2H2O as raw materials.The photocatalytic activity of prepared materials was tested by the degradation of Rhodamine B (RhB)solution under visible-light irradiation (λ>420 nm).The effects of pH value of precursor suspensions, reaction temperature and time on the catalytic behavior were investigated.Samples prepared by precursor sus-pension with different pH were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),UV-visible diffuse-reflection spectroscopy (UV-Vis)and brunauer-emmet-teller method (BET).The results indicated that pH value of precursor suspension was the crucial factor to the photocatalytic activity of Bi2 WO6 ,and had a strong influence on its microstructure.The sample prepared by precursor suspension with pH=4.5 obtained the optimal photocatalytic activity (the degradation of RhB was up to 99.90% under 90 min irradiation).In addition,the catalytic activity of the catalyst remained constant after 4 runs of the experiment, demonstrating that Bi2 WO6 was an efficient and stable visible-light photocatalyst.
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