Pliˇzingrová, Eva and Volfová, Lenka and Svora, Petr and Labhsetwar, Nitin and Klementová, Mariana and Szatmáry, Lórant and Subrt, Jan (2015) Highly photoactive anatase foams prepared from lyophilized aqueouscolloids of peroxo-polytitanic acid. Catalysis Today, 240 (Part A). pp. 107-113. ISSN 0920-5861

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Abstract

tPeroxo-polytitanic acid foams annealed at temperature above 500◦C lose volatile components and excessof oxygen providing anatase in the form of thin leaves consisting of intergrown nanocrystalline anataseparticles which transform at temperatures above 850◦C to rutile. The size and shape of the initialleaflets forming the foam is preserved up to ∼900◦C. We observed that the annealed material is highlyphotoactive, owing to highly anisotropic shape of anatase aggregates and their perfect crystallinity. Out-standing photocatalytic activity determined by measuring the kinetics of degradation of Methylene Blue(MB) and 4-chlorphenol (4-CP) as well as measuring the formation of hydroxyl radical spin adductsby EPR spectroscopy was observed. All three methods demonstrated significantly higher activity incomparison with the Degussa P25 photocatalyst. Both methods used for photoactivity tests providedsimilar results, the activity increased with increasing annealing temperature in order 500◦C < DegussaP25 < 600◦C < 850–950◦C. Results of measurement of formation of •OH radicals by EPR also confirmedthe unusually high activity of our materials. In comparison with the Degussa P25, the sample annealedat 950◦C showed significantly higher production of•OH radicals.

Item Type:	Article
Uncontrolled Keywords:	Anatase; Lyophilization; Photocatalysis; Hydroxyl Radical; Peroxo- polytitanic Acid Foams
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Nitin Labhasetwar
Date Deposited:	11 Jan 2018 09:19
Last Modified:	11 Jan 2018 09:19
URI:	http://neeri.csircentral.net/id/eprint/1091

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