Preparation of black sand-based magnetic photocatalysts for photocatalytic oxidation of aqueous phenol

M Luo, D Bowden, P Brimblecombe

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Abstract

A natural magnetic material, black sand, was used as cores to prepare a magnetic photocatalyst, which can be recovered using an external magnetic field. A surfactant-involved scheme was proposed to deposit a rough silica layer on the surface of black sand, which otherwise could not be coated with silica through a conventional scheme involving Stöber process. Titanium dioxide (TiO2) was deposited on the surface of the silica-black sand (Si/BS) through an impregnation process and a direct deposition process. The catalytic property of the resultant photocatalyst (Ti/Si/BS) was evaluated using the oxidation of aqueous phenol and exhibited less reactivity than Degussa P25 TiO2. The phenol removal efficiency showed a pH dependence, which was ascribed to pH effect on (a) the formation of *OH and (b) the electrostatic interaction between the photocatalyst and the substrate. The prepared photocatalyst is reusable despite slight deactivation caused by the mechanical loss of TiO2.
Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalApplied Catalysis B: Environmental
Volume87
Issue number1-2
DOIs
Publication statusPublished - 2009

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