Preparation of porous TiO2 cryogel fibers through unidirectional freezing of hydrogel followed by freeze-drying

被引:82
作者
Mukai, SR [1 ]
Nishihara, H [1 ]
Shichi, S [1 ]
Tamon, H [1 ]
机构
[1] Kyoto Univ, Dept Chem Engn, Nishikyo Ku, Kyoto 6158510, Japan
关键词
D O I
10.1021/cm0491328
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Porous titania cryogel fibers (TCFs) were prepared through the unidirectional freezing and subsequent freeze-drying of titania hydrogels, which were synthesized by sol-gel polymerization of titanium tetraisopropoxide (TTIP) using dialysis. By adjusting the concentrations of TTIP, and using freeze-drying after replacing the water included in the titania hydrogel fibers with tert-butyl alcohol, mesoporous TCFs which maintained their unique fiber morphology were successfully prepared. The as-dried TCFs were transparent, contained anatase structure, and had BET surface areas over 400 m(2)/g. Nitrogen adsorption-desorption measurements, powder X-ray diffractometry (XRD), scanning laser microscopy, and scanning electron microscopy (SEM) were used to characterize the physical properties of TCFs. The effect of heat treatment after freeze-drying on the porous properties and crystal structures of TCFs was examined. It was found that BET surface areas and mesopore volumes of TCFs decrease with the increase in heat treatment temperature. On the other hand, the XRD peak intensity corresponding to anatase structure increases with the increase in heat treatment temperature in the range below 773 K. Photocatalytic decomposition activities of large organic molecules on TCFs was also measured and the results were compared with those from a commercial photocatalyst, Degussa P-25. Moreover, photocatalytic decomposition of methylene blue was examined by using TCF-packed columns.
引用
收藏
页码:4987 / 4991
页数:5
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