Magnetically Agitated Photocatalytic Reactor for Photocatalytic Oxidation of Aqueous Phase Organic Pollutants

摘要

A magnetically agitated photocatalytic reactor (MAPR) has been developed and assessed for oxidation of phenol.The MAPR uses a titanium dioxide composite photocatalyst with a ferromagnetic barium ferrite core.The catalyst motion was controlled with a dual-component magnetic field.First,a permanent magnet above the reactor provided a static magnetic field to counteract the force of gravity,hence increasing catalyst exposure to UV.Second,an alternating magnetic field generated by a solenoid was used to agitate the catalyst,thus increasing mass transfer between pollutants and byproducts to the catalyst.Optimal performance of the MAPR was achieved with the permanent magnet present and 1 A of alternating current to the solenoid between 20 and 80 Hz.Operating with a 60-Hz signal at 1 A with the permanent magnet present and 100 mg of catalyst,the system reduced an 11 mg/L phenol concentration by 97% and decreased nonpurgeable dissolved organic carbon by 93% in 7 h using three 8-W 365-nm peak UV lamps.