Photocatalytic degradation of formaldehyde in a fluidized bed with sound-magnetic assistance

The photocatalytic degradation of formaldehyde in a sound-magnetic assisted fluidized bed (SMFB) was investigated using Degussa P25 catalyst and Fe3O4 particles as the fluidized media. The effects of magnetic induction, sound pressure level, and sound frequency on the degradation rate of formaldehyde were investigated. Compared with fluidized bed (FB), sound assisted fluidized bed (SFB), magnetic assisted fluidized bed (MFB), SMFB could enhance the degradation efficiency of formaldehyde effectively. Experimental results showed that the degradation efficiency of formaldehyde increased with increasing magnetic induction and sound pressure level. The degradation efficiency of formaldehyde increased with increasing sound frequency ranging from 50 to 100 Hz, further decreased with increasing sound frequency from 100 to 150 Hz. Moreover, it was found that the reaction kinetic fitted the pseudo-first-order kinetic equation, which provided a detailed kinetic understanding of photocatalytic degradation of formaldehyde in SMFB.

A novel sound-magnetic assisted fluidized bed was designed in this investigation. The experimental system consisted of a fluidized bed, a sound field supply system, a magnetic field supply system, a light wave supply system and some sampling instruments.Figure optionsDownload as PowerPoint slideHighlights
► We designed a novel sound-magnetic assisted fluidized bed (SMFB).
► SMFB could enhance the degradation efficiency of formaldehyde effectively.
► The reaction kinetic fitted the pseudo-first-order kinetic equation.