简单水热法制备纳米WO_3及其光催化性能

SIMPLE HYDROTHERMAL SYNTHESIS OF NANOSIZED WO_3 AND ITS PHOTOCATALYTIC ACTIVITY

以钨酸为原料,在不使用任何添加剂的条件下,采用水热法制备纳米WO3。利用X射线粉末衍射(XRD)、透射电镜(TEM)、场发射扫描电镜(FESEM)和紫外可见光谱(UV-Vis)对其结构和形貌进行表征,并通过紫外-可见分光光度计分析纳米WO3可见光降解亚甲基蓝来研究其光催化活性。结果表明,以钨酸为原料110℃水热反应7 h,制备得到单斜相结构的不规则片状纳米WO3,纳米WO3具有较高的可见光催化活性,在可见光下,pH=3.24,催化剂用量为3 g/L时能够有效地降解初始质量浓度为30 mg/L的亚甲基蓝,并且降解速率可用1级动力学方程来描述。

WO3 nanoparticles were prepared via a simple hydrothermal method using tungstic acid as raw materials under the conditions of not using any additives. The products were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, field emission scanning electron microscopy （FESEM） and UV-Vis spectrum. The photocatalytic activities of the WO3 nanoparticles were tested by the photocatalytic degradation of methylene blue. Results indicated that the monoclinic structure WO3 nanosheets were prepared hydrothermally at 110 ~C for 7 h, using W.ngstic acid as raw materials. Under visible light irradiation, pH=3.24, 30 mg/L methylene blue could be degradation by 3 g/L WO3 nanosheets thoroughly, which shows good photocatalytic activity and the degradation rate can be described using a kinetic equation.