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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。
Using tungstic acid as raw material, nano-WO3 was prepared by hydrothermal method without using any additives. Its structure and morphology were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) and UV-Vis spectroscopy. WO3 visible degradation of methylene blue to study its photocatalytic activity. The results showed that the amorphous monoclinic WO3 with the monoclinic phase was prepared by hydrothermal reaction at 110 ℃ for 7 h using tungstic acid as starting material, and the nano-WO3 exhibited high visible light catalytic activity. Under visible light, pH = 3.24, the catalyst dosage At 3 g / L, methylene blue with an initial concentration of 30 mg / L can be effectively degraded, and the degradation rate can be described by the first order kinetic equation.