Preparation and Utilization of Organically Modified Silica-Titania Photocatalysts for Decontamination of Aquatic Environments

Geula Dagan; Srinivasan Sampath; Ovadia Lev

doi:10.1021/cm00051a003

Preparation and Utilization of Organically Modified Silica-Titania Photocatalysts for Decontamination of Aquatic Environments

Geula Dagan, Srinivasan Sampath, Ovadia Lev^*

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

96 Scopus citations

Abstract

A new class of photocatalysts that can be used for decontamination of aquatic environments from organic and chloroorganic contaminants is reported. The photocatalysts are comprised of homogeneous dispersion of TiO₂ nanocrystals in organically modified SiO₂. These composite materials were prepared by a two-step acid catalyzed sol-gel preparation protocol. The combination of the improved photocatalytic activity of homogeneous dispersion of segregated nanocrystalline TiO₂ and the adsorption properties of organically modified silica increases the rate of decomposition of hydrophobic organic pollutants in aquatic environments. An additional advantage of these catalysts is their floating capability. This property provides a possibility of using them under solar illumination. The activity of the organically modified SiO₂-TiO₂ catalyst is compared with that of commercial nanocrystalline TiO₂ and TiO₂-SiO₂ and TiO₂ sol-gel derived xerogels, under solar light and UV lamp irradiation.

Original language	English
Pages (from-to)	446-453
Number of pages	8
Journal	Chemistry of Materials
Volume	7
Issue number	3
DOIs	https://doi.org/10.1021/cm00051a003
State	Published - Mar 1995

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title = "Preparation and Utilization of Organically Modified Silica-Titania Photocatalysts for Decontamination of Aquatic Environments",

abstract = "A new class of photocatalysts that can be used for decontamination of aquatic environments from organic and chloroorganic contaminants is reported. The photocatalysts are comprised of homogeneous dispersion of TiO2 nanocrystals in organically modified SiO2. These composite materials were prepared by a two-step acid catalyzed sol-gel preparation protocol. The combination of the improved photocatalytic activity of homogeneous dispersion of segregated nanocrystalline TiO2 and the adsorption properties of organically modified silica increases the rate of decomposition of hydrophobic organic pollutants in aquatic environments. An additional advantage of these catalysts is their floating capability. This property provides a possibility of using them under solar illumination. The activity of the organically modified SiO2-TiO2 catalyst is compared with that of commercial nanocrystalline TiO2 and TiO2-SiO2 and TiO2 sol-gel derived xerogels, under solar light and UV lamp irradiation.",

author = "Geula Dagan and Srinivasan Sampath and Ovadia Lev",

year = "1995",

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N2 - A new class of photocatalysts that can be used for decontamination of aquatic environments from organic and chloroorganic contaminants is reported. The photocatalysts are comprised of homogeneous dispersion of TiO2 nanocrystals in organically modified SiO2. These composite materials were prepared by a two-step acid catalyzed sol-gel preparation protocol. The combination of the improved photocatalytic activity of homogeneous dispersion of segregated nanocrystalline TiO2 and the adsorption properties of organically modified silica increases the rate of decomposition of hydrophobic organic pollutants in aquatic environments. An additional advantage of these catalysts is their floating capability. This property provides a possibility of using them under solar illumination. The activity of the organically modified SiO2-TiO2 catalyst is compared with that of commercial nanocrystalline TiO2 and TiO2-SiO2 and TiO2 sol-gel derived xerogels, under solar light and UV lamp irradiation.

AB - A new class of photocatalysts that can be used for decontamination of aquatic environments from organic and chloroorganic contaminants is reported. The photocatalysts are comprised of homogeneous dispersion of TiO2 nanocrystals in organically modified SiO2. These composite materials were prepared by a two-step acid catalyzed sol-gel preparation protocol. The combination of the improved photocatalytic activity of homogeneous dispersion of segregated nanocrystalline TiO2 and the adsorption properties of organically modified silica increases the rate of decomposition of hydrophobic organic pollutants in aquatic environments. An additional advantage of these catalysts is their floating capability. This property provides a possibility of using them under solar illumination. The activity of the organically modified SiO2-TiO2 catalyst is compared with that of commercial nanocrystalline TiO2 and TiO2-SiO2 and TiO2 sol-gel derived xerogels, under solar light and UV lamp irradiation.

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Preparation and Utilization of Organically Modified Silica-Titania Photocatalysts for Decontamination of Aquatic Environments

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