Abstract
In order to more easily separate TiO 2 photocatalyst from the treated wastewater, TiO 2 was immobilized on the surface of coal fly ash by employing three kinds of approaches, sol–gel procedure, ambient hydrolysis procedure and hybrid slurry procedure. The effects of loading method on the structural property of TiO 2-coated coal fly ash (TiO 2/CFA), such as morphology, crystal structure, porous property and ultraviolet-visible absorption were investigated, and the photocatalytic activity of TiO 2/CFA was evaluated by the photocatalytic depigmentation and mineralization of methyl orange solution. The results show that TiO 2/CFA particles are easy to precipitate and recover from water. The hybrid slurry procedure is a more proper method to immobilize TiO 2 on coal fly ash than the other two procedures because the TiO 2/CFA sample prepared by hybrid slurry procedure exhibits higher photocatalytic activity and better repeatability.
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