title: Removal of SO2 with a Mg-Al oxide slurry via reconstruction of a Mg-Al layered double hydroxide.
abstract: Although effective treatments of SO(x) 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 SO(2) from waste streams using a Mg-Al oxide slurry. The ability of the mixed oxide to remove SO(2) increased with slurry quantity and temperature but decreased with time. SO(2) was removed through the reconstruction of a Mg-Al layered double hydroxide (Mg-Al LDH) intercalated with SO(3)(2-), which was derived from the dissociation of H(2)SO(3) upon dissolution of SO(2) in the slurry. SO(2) was not adsorbed onto the surface of the Mg-Al oxide. These results suggest that SO(2) removal using a Mg-Al oxide slurry may be possible without the concomitant problems of conventional treatment methods.
authors.affiliation: Graduate School of Environmental Studies, Tohoku University, Aramaki, Aoba-ku, Sendai, Japan. kameda@env.che.tohoku.ac.jp
authors.forename: Tomohito
authors.initials: T
authors.lastname: Kameda
authors.forename: Aki
authors.initials: A
authors.lastname: Kodama
authors.forename: Yuki
authors.initials: Y
authors.lastname: Fubasami
authors.forename: Shogo
authors.initials: S
authors.lastname: Kumagai
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Yoshioka
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D000536:Aluminum Hydroxide / Q000737:chemistry*; D004338:Drug Combinations; D008276:Magnesium Hydroxide / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D013458:Sulfur Dioxide
chemical_list: D000393:Air Pollutants; D004338:Drug Combinations; D013458:Sulfur Dioxide; C013591:aluminum hydroxide, magnesium hydroxide, drug combination; D000536:Aluminum Hydroxide; D008276:Magnesium Hydroxide