采用水热法，通过控制反应时间合成了单斜相的纳米WO₃粉体。使用X射线粉末衍射仪对产物的物相结构进行表征，并通过紫外–可见分光光度计分析纳米WO₃光降解亚甲基蓝(MB)实验来研究水热反应时间对所制备的纳米WO₃光催化活性的影响。结果表明：水热条件下，反应温度为110℃时，反应时间为14 h的纳米WO₃样品具有最好的光催化活性，在500 W氙灯照射120 min后对MB的降解率达到了95%，显示了其优良的光催化性能。
The monoclinic nano WO₃ were prepared by hydrothermal method. The phase structure of the as-prepared samples was characterized by X-ray powder diffraction (XRD). The effect of reaction time on the photocatalytic activity of the prepared WO₃ samples was analyzed on UV-Vis spectro-photometer. The results show that the WO₃ sample synthesized at 110？C for 14 h has the highest photocatalytic activity. Under the 500 W Xe lamp irradiation, the degradation rate for MB within 120 min reached 95%, showing superior photocatalytic properties.