37. Effect of calcination temperature on physical parameters and photocatalytic activity of mesoporous titania spheres using chitosan/poly(vinyl alcohol) hydrogel beads as a template
作者：R. Jiang, H.-Y. Zhu, H.-H. Chen, J. Yao, Y.-Q. Fu, Z.-Y. Zhang, Y.-M. Xu
關鍵字：chitosan
論文來源：期刊
具體來源：Applied Surface Science
發(fā)表時間：2014年
Mesoporous titania spheres
were prepared by modi?ed sol–gel method using chitosan/poly(vinyl alcohol)
hydrogel beads as a template. Effects of calcination
temperature on physical parameters were investigated by X-ray diffraction (XRD),
N2 adsorption-desorption, Fourier transform infrared (FT-IR) spectra,
thermogravimetry and differential thermal analyses (TG-DTA), high-resolution
transmission electron microscope (HRTEM) and scanning electron microscopy (SEM). The photocatalytic activity of mesoporous titania
spheres prepared was also evaluated by photocatalytic degradation of phenol as
a model molecule under UV irradiation. With increasing calcination temperature,
average crystallite size and pore size increased. In contrast, Brunauer-Emmett-Teller (BET) specific surface areas, porosity
and pore volumes steadily decreased. Results of characterization proved that
prepared titania spheres with highly organized pores were mesoporous structure.
The photocatalytic activity of mesoporous titania spheres calcined at 500°C was
more effective than those calcined at other temperatures, which were attributed
to the porous structure, large BET surface area, crystalline, and smaller
crystallite size. This work may provide new
insights into the preparation of novel mesoporous titania spheres and further
practical applications in the treatment of wastewater.