Core-Shell Microspherical Ti_(1-x)Zr_xO_2 Solid Solution Photocatalysts Directly from Ultrasonic Spray Pyrolysis

摘要

A series of Ti_(1-x)Zr_xO_2 solid solutions photocatalysts(x = 0.000,0.045,0.090,0.135,and 0.180)was directly obtained by an ultrasonic spray pyrolysis method.Compared with previous methods for solid solutions,our preparation was very fast.The resulting samples were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,high-resolution transmission electron microscopy,nitrogen adsorption,and UV-vis diffuse reflectance spectroscopy.The characterizations revealed core-shell spherical structures of the resulting solid solutions.We evaluated photocatalytic activities of the solid solutions on degradation of rhodamine B in aqueous solution under simulated solar light.It was found that Ti_(0.91)Zr_(0.09)O_2 solid solution exhibited the highest photocatalytic activity among all the as-prepared samples.Its activity was much higher than that of P25.The formation mechanism of core-shell spherical structures was proposed.Moreover,we successfully extended this method to prepare microspheres of ceria and ceria-zirconia solid solutions.We think this general method may be easily scaled up for industrial production of microspherical solid solutions photocatalysts and catalysts.