Self-generated hierarchically porous titania with high surface area: Photocatalytic activity enhancement by macrochannel structure

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Abstract

Various hierarchical porous titania with high surface area over 600m /g have been synthesized via a spontaneous self-formation process from titanium alkoxides by a water adjusting approach using acetonitrile as reaction medium. The reactivity of metal alkoxides and the water content in acetonitrile medium on the resultant structure have been investigated. The porosities of the products were characterized by SEM, TEM and N adsorption-desorption measurements. The observation on the evolution of porous structure with increasing water content in reaction system is essential for a better understanding of hierarchical porous structure formation over different length scales by this self-formation process. The creation of macro/micropores in photocatalytic titania materials has been found to enhance the photocatalytic activity due to both the action of macrochannels as light harvester and the easy diffusion effect of organic molecules. The present work shows clearly that hierarchically porous titania with the presence of macroporous structure and high surface area can be very efficient photocatalysts, suggesting their potential applications in water treatment as decontamination materials.
Original languageEnglish
Pages (from-to)128-138
Number of pages11
JournalJournal of Colloid and Interface Science
Volume368
Issue number1
DOIs
Publication statusPublished - 15 Feb 2012

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Titanium
Water content
Acetonitrile
Harvesters
Decontamination
Photocatalysts
Water treatment
Macros
Desorption
Porosity
Metals
Transmission electron microscopy
Adsorption
Scanning electron microscopy
Molecules
Water
titanium dioxide
acetonitrile

Cite this

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title = "Self-generated hierarchically porous titania with high surface area: Photocatalytic activity enhancement by macrochannel structure",
abstract = "Various hierarchical porous titania with high surface area over 600m /g have been synthesized via a spontaneous self-formation process from titanium alkoxides by a water adjusting approach using acetonitrile as reaction medium. The reactivity of metal alkoxides and the water content in acetonitrile medium on the resultant structure have been investigated. The porosities of the products were characterized by SEM, TEM and N adsorption-desorption measurements. The observation on the evolution of porous structure with increasing water content in reaction system is essential for a better understanding of hierarchical porous structure formation over different length scales by this self-formation process. The creation of macro/micropores in photocatalytic titania materials has been found to enhance the photocatalytic activity due to both the action of macrochannels as light harvester and the easy diffusion effect of organic molecules. The present work shows clearly that hierarchically porous titania with the presence of macroporous structure and high surface area can be very efficient photocatalysts, suggesting their potential applications in water treatment as decontamination materials.",
author = "X.-Y. Li and L.-H. Chen and Y. Li and J.C. Rooke and C. Wang and Y. Lu and A. Krief and X.-Y. Yang and B.-L. Su",
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AU - Li, X.-Y.

AU - Chen, L.-H.

AU - Li, Y.

AU - Rooke, J.C.

AU - Wang, C.

AU - Lu, Y.

AU - Krief, A.

AU - Yang, X.-Y.

AU - Su, B.-L.

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N2 - Various hierarchical porous titania with high surface area over 600m /g have been synthesized via a spontaneous self-formation process from titanium alkoxides by a water adjusting approach using acetonitrile as reaction medium. The reactivity of metal alkoxides and the water content in acetonitrile medium on the resultant structure have been investigated. The porosities of the products were characterized by SEM, TEM and N adsorption-desorption measurements. The observation on the evolution of porous structure with increasing water content in reaction system is essential for a better understanding of hierarchical porous structure formation over different length scales by this self-formation process. The creation of macro/micropores in photocatalytic titania materials has been found to enhance the photocatalytic activity due to both the action of macrochannels as light harvester and the easy diffusion effect of organic molecules. The present work shows clearly that hierarchically porous titania with the presence of macroporous structure and high surface area can be very efficient photocatalysts, suggesting their potential applications in water treatment as decontamination materials.

AB - Various hierarchical porous titania with high surface area over 600m /g have been synthesized via a spontaneous self-formation process from titanium alkoxides by a water adjusting approach using acetonitrile as reaction medium. The reactivity of metal alkoxides and the water content in acetonitrile medium on the resultant structure have been investigated. The porosities of the products were characterized by SEM, TEM and N adsorption-desorption measurements. The observation on the evolution of porous structure with increasing water content in reaction system is essential for a better understanding of hierarchical porous structure formation over different length scales by this self-formation process. The creation of macro/micropores in photocatalytic titania materials has been found to enhance the photocatalytic activity due to both the action of macrochannels as light harvester and the easy diffusion effect of organic molecules. The present work shows clearly that hierarchically porous titania with the presence of macroporous structure and high surface area can be very efficient photocatalysts, suggesting their potential applications in water treatment as decontamination materials.

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