title: Removal of tetrafluoroborate ion from aqueous solution using magnesium-aluminum oxide produced by the thermal decomposition of a hydrotalcite-like compound.
abstract: Magnesium-aluminum oxide (Mg-Al oxide) prepared by the thermal decomposition of a hydrotalcite-like compound was found to have potential for treating NaBF(4) wastewater. The Mg-Al oxide removed the BF(4)(-) and F(-) and H(3)BO(3) from the NaBF(4) solution. With increasing Mg-Al oxide quantity and time, the BF(4)(-) concentration decreased and the degree of BF(4)(-), F(-), and boron removal increased. The decrease in the BF(4)(-) concentration resulted from uptake by the Mg-Al oxide and not hydrolysis. The Mg-Al oxide took up F(-) from the solution preferentially. The Mg-Al oxide also converted the H(3)BO(3) in the aqueous solution into H(2)BO(3)(-), which it took up.
authors.affiliation: Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 6-6-07, Aoba-ku, Sendai 980-8579, Japan. yoshioka@env.che.tohoku.ac.jp
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Yoshioka
authors.forename: Tomohito
authors.initials: T
authors.lastname: Kameda
authors.forename: Motoya
authors.initials: M
authors.lastname: Miyahara
authors.forename: Miho
authors.initials: M
authors.lastname: Uchida
authors.forename: Tadaaki
authors.initials: T
authors.lastname: Mizoguchi
authors.forename: Akitsugu
authors.initials: A
authors.lastname: Okuwaki
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D000536:Aluminum Hydroxide / Q000737:chemistry*; D001881:Borates; D001888:Boric Acids / Q000302:isolation & purification*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007477:Ions; D017616:Magnesium Compounds / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry*; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D017607:Aluminum Compounds; D001881:Borates; D001888:Boric Acids; D007477:Ions; D017616:Magnesium Compounds; D012996:Solutions; D014874:Water Pollutants, Chemical; C110424:aluminum magnesium oxide; C010467:hydrotalcite; D000536:Aluminum Hydroxide; C098759:fluoroboric acid; D008276:Magnesium Hydroxide