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

Shin R. Mukai, Hirotomo Nishihara, Seiji Shichi, Hajime Tamon

研究成果: Article査読

83 被引用数 (Scopus)

抄録

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 m2/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.

本文言語English
ページ(範囲)4987-4991
ページ数5
ジャーナルChemistry of Materials
16
24
DOI
出版ステータスPublished - 2004 11 30
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 材料化学

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