纳米TiO_2/粉煤灰复合材料的制备及光催化性质

Preparation and photocatalysis of TiO_2/fly-ash nanocomposite

为了提高TiO2的光催化效果,使催化剂易于回收再利用,利用粉煤灰为载体,采用低温超声水热法制备纳米TiO2/粉煤灰复合光催化剂。借助X射线衍射(XRD)、扫描电镜(TEM)、红外(IR)和紫外-可见(UV-Vis)光谱分析对产物进行了表征,研究了TiO2加入量、超声时间等对复合物形貌、晶型和性能的影响。光催化降解亚甲基蓝的实验结果表明,由于TiO2和粉煤灰的共同作用,所得复合光催化剂的性能优于纯TiO2的光催化性能。

The TiO2/fly-ash nanocomposite, a novel photocatalyst, was prepared by an ultrasound hydrothermal synthesis at mild temperature, to improve the photocatalytic activity of TiO2 and make it reused easily. The products as-prepared were characterized by scanning electron microscopy （SEM）, X-ray diffraction（XRD）, IR and UV-Vis spectral analysis. The effect of TiO2 amount and ultrasound time on the morphology, crystal and property of the product was studied. Taking methylene blue （MB） as model, the photocatalysis performance of the photocatalysts was observed. The results showed that the photocatalytic activity of the TiO2/fly ash nano- composite is higher than that of pure TiO2, due to the interaction between TiO2 and fly-ash.