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

Research output: Contribution to journalArticlepeer-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 languageAmerican English
Pages (from-to)2533-2540
Number of pages8
JournalChemistry of Materials
Volume9
Issue number11
DOIs
StatePublished - Nov 1997

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