Effects of templates on the structure, stability and photocatalytic activity of mesostructured TiO2

Q. Dai, L. Y. Shi, Y. G. Luo, J. L. Blin, D. J. Li, C. W. Yuan, B. L. Su

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

Using long-chain alkylphosphate and alkylamine surfactants as templates, two kinds of purely mesoporous TiO2 molecular sieves (Ti-TMS) were prepared by hydrolysis of titanium isopropoxide under completely different conditions. The templates can be successfully removed by refluxing the samples in an EtOH/H2O/HN03 solution. Properties of the samples were characterized by means of SEM, FT-IR, DR-UV, TEM, XRD and TG-DTA techniques. XRD patterns and TEM images confirm that the uniformity and stability of Ti-TMS1 synthesized with dodecylphosphate, hexadecylphosphate, or octadecylphosphate as templates is superior to that of Ti-TMS2 prepared with dodecylamine. Furthermore, after the removal of the templates, the stability and the structure of the mesoporous Ti-TMS1 are better than that of Ti-TMS2. Effects of other factors on the structure and stability of Ti-TMS are discussed. The photocatalytic activities of Ti-TMS were also investigated by using polychlorophenol (TCP) and reactive red dye (X-3B) solutions as model pollutants. It was found that the amount of the templates greatly affects the photoactivity of these kind of mesoporous materials.

langue originaleAnglais
Pages (de - à)295-301
Nombre de pages7
journalJournal of Photochemistry and Photobiology A: Chemistry
Volume148
Numéro de publication1-3
Les DOIs
Etat de la publicationPublié - 31 mai 2002

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