title: Synthesis and sulfate ion-exchange properties of a hydrotalcite-like compound intercalated by chloride ions.
abstract: To reduce the generation of hydrogen sulfide gas from sulfate ions, we synthesized a layered double hydroxide hydrotalcite-like compound intercalated with chloride ions in the interlayer (HT-Cl) using a coprecipitation reaction. The resultant HT-Cl material had a Mg/Al molar ratio of approximately 2, and the molar fraction of the chloride ions on the intercalated anion layer of the HT was 0.90. A higher molar fraction of chloride ions can be inserted into the interlayers of the HT by increasing the initial concentration ratio of chloride ions to aluminum ions [Cl(-)](0)/[Al(3+)](0) in the solution. Approximately 98% of the sulfate ions in the solution were removed within 10 min after adding 1.12 times the stoichiometric quantity of synthesized HT-Cl, which contained a Mg/Al molar ratio of 2 equal to a solution containing a 12 mM calcium sulfate solution.
authors.affiliation: Graduate School of Environmental Studies, Tohoku University, Aoba 6-6-20, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Akino
authors.initials: A
authors.lastname: Tsujimura
authors.forename: Miho
authors.initials: M
authors.lastname: Uchida
authors.forename: Akitsugu
authors.initials: A
authors.lastname: Okuwaki
mesh_terms: D000397:Air Pollution / Q000517:prevention & control; D000536:Aluminum Hydroxide / Q000138:chemical synthesis* / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry*; D007474:Ion Exchange; D008276:Magnesium Hydroxide / Q000138:chemical synthesis* / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry*
chemical_list: D002712:Chlorides; D013431:Sulfates; C010467:hydrotalcite; D000536:Aluminum Hydroxide; D008276:Magnesium Hydroxide