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.
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