Although effective treatments of SOx are essential for preventing air pollution, current methods pose other environmental problems such as increased amounts of desulfurized gypsum and reduced landfill lifetimes. We report a process for removing SO2 from waste streams using a Mg-Al oxide slurry. The ability of the mixed oxide to remove SO2 increased with slurry quantity and temperature but decreased with time. SO2 was removed through the reconstruction of a Mg-Al layered double hydroxide (Mg-Al LDH) intercalated with SO32-, which was derived from the dissociation of H2SO3 upon dissolution of SO2 in the slurry. SO2 was not adsorbed onto the surface of the Mg-Al oxide. These results suggest that SO2 removal using a Mg-Al oxide slurry may be possible without the concomitant problems of conventional treatment methods.
- Mg-Al oxide slurry
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Health, Toxicology and Mutagenesis