Sol-Gel Derived Ormosil-Exfoliated Graphite-TiO2 Composite Floating Catalyst: Photodeposition of Copper

Kumaran Ramanathan; David Avnir; Alexander Modestov; Ovadia Lev

doi:10.1021/cm960637a

Sol-Gel Derived Ormosil-Exfoliated Graphite-TiO₂ Composite Floating Catalyst: Photodeposition of Copper

Kumaran Ramanathan, David Avnir, Alexander Modestov, Ovadia Lev^*

^*Corresponding author for this work

Institute of Chemistry

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

49 Scopus citations

Abstract

A new class of floating photocatalyst that can be used for recovery of copper from aqueous solutions is reported. The photocatalyst is comprised of a dispersion of titania nanocrystals in exfoliated graphite using organically modified silicate (Ormosil) as a binder. The composite materials were prepared by a two-step acid-catalyzed sol-gel preparation protocol. The efficiency of copper recovery under UV irradiation is compared for the floating catalysts, nanocrystalline titania suspension, and titania films. The floating catalyst could be used for prolonged duration, showed good regeneration capability and considerable amount of the recovered copper "peeled off" in metallic form, and could be in solid form without further acid redissolution.

Original language	English
Pages (from-to)	2533-2540
Number of pages	8
Journal	Chemistry of Materials
Volume	9
Issue number	11
DOIs	https://doi.org/10.1021/cm960637a
State	Published - Nov 1997

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abstract = "A new class of floating photocatalyst that can be used for recovery of copper from aqueous solutions is reported. The photocatalyst is comprised of a dispersion of titania nanocrystals in exfoliated graphite using organically modified silicate (Ormosil) as a binder. The composite materials were prepared by a two-step acid-catalyzed sol-gel preparation protocol. The efficiency of copper recovery under UV irradiation is compared for the floating catalysts, nanocrystalline titania suspension, and titania films. The floating catalyst could be used for prolonged duration, showed good regeneration capability and considerable amount of the recovered copper {"}peeled off{"} in metallic form, and could be in solid form without further acid redissolution.",

author = "Kumaran Ramanathan and David Avnir and Alexander Modestov and Ovadia Lev",

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AU - Lev, Ovadia

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N2 - A new class of floating photocatalyst that can be used for recovery of copper from aqueous solutions is reported. The photocatalyst is comprised of a dispersion of titania nanocrystals in exfoliated graphite using organically modified silicate (Ormosil) as a binder. The composite materials were prepared by a two-step acid-catalyzed sol-gel preparation protocol. The efficiency of copper recovery under UV irradiation is compared for the floating catalysts, nanocrystalline titania suspension, and titania films. The floating catalyst could be used for prolonged duration, showed good regeneration capability and considerable amount of the recovered copper "peeled off" in metallic form, and could be in solid form without further acid redissolution.

AB - A new class of floating photocatalyst that can be used for recovery of copper from aqueous solutions is reported. The photocatalyst is comprised of a dispersion of titania nanocrystals in exfoliated graphite using organically modified silicate (Ormosil) as a binder. The composite materials were prepared by a two-step acid-catalyzed sol-gel preparation protocol. The efficiency of copper recovery under UV irradiation is compared for the floating catalysts, nanocrystalline titania suspension, and titania films. The floating catalyst could be used for prolonged duration, showed good regeneration capability and considerable amount of the recovered copper "peeled off" in metallic form, and could be in solid form without further acid redissolution.

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Sol-Gel Derived Ormosil-Exfoliated Graphite-TiO₂ Composite Floating Catalyst: Photodeposition of Copper

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